Gas recovery system

Abstract

An electrochemical cell is configured by laminating a working electrode (104), a counter electrode (106), a separator (107), a working electrode current collector (103), and a counter electrode current collector (105). The working electrode adsorbs a gas to be recovered. The counter electrode and the working electrode transmit and receive electrons. The separator is disposed between the working electrode and the counter electrode to prevent physical contact between the working electrode and the counter electrode and suppress an electrical short circuit. The working electrode collector material is in contact with the working electrode to electrically connect the working electrode and the counter electrode. The counter electrode collector material is in contact with the counter electrode and electrically connects the working electrode and the counter electrode. The counter electrode surrounding member is configured to cover the counter electrode and the counter electrode collector material with respect to the electrochemical cell, and suppress contact between the mixed gas and the counter electrode.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on Japanese Patent Application No. 2022-109070 filed on July 6, 2022, and the contents thereof are cited herein. Technical Field

[0003] The present disclosure relates to a gas recovery system for recovering a gas to be recovered from a mixed gas containing the gas to be recovered. Background Art

[0004] Conventionally, a carbon dioxide recovery system for recovering carbon dioxide as a recovery target gas from a mixed gas containing carbon dioxide is disclosed in Patent Document 1. The carbon dioxide recovery system of Patent Document 1 includes an electrochemical cell for adsorbing carbon dioxide by an electrochemical reaction.

[0005] The electrochemical cell is formed as a laminated body formed by laminating a working electrode, a counter electrode, a working electrode current collecting material, a counter electrode current collecting material, etc., which are respectively formed in a flat plate shape. The working electrode includes a carbon dioxide adsorbing material that absorbs carbon dioxide from a mixed gas. The counter electrode includes an electroactive auxiliary material that transmits and receives electrons with the working electrode. The working electrode current collecting material is an electrode that abuts the working electrode. The counter electrode current collecting material is an electrode that abuts the counter electrode.

[0006] Patent document 1: Japanese Patent Application Publication No. 2018-533470.

[0007] Here, in the carbon dioxide recovery system, in order to adsorb carbon dioxide on the carbon dioxide adsorbent of the working electrode, it is necessary to expose the working electrode to the mixed gas. Therefore, in Patent Document 1, the working electrode current collecting material is formed by a gas permeable membrane.

[0008] On the other hand, if the counter electrode is exposed to the mixed gas, the electric potential applied to the counter electrode may oxidize the electroactive auxiliary material of the counter electrode. If the electroactive auxiliary material is oxidized, the recovery capability of the recovery target gas in the gas recovery system is considered to be reduced. Summary of the invention

[0009] The present disclosure has been made in view of the above-mentioned viewpoints, and an object thereof is to provide a gas recovery system capable of suppressing a decrease in the recovery capability of a gas to be recovered.

[0010] A gas recovery system according to one embodiment of the present disclosure is a gas recovery system that recovers a recovery target gas from a mixed gas by an electrochemical reaction, and includes an electrochemical cell and a counter electrode surrounding member.

[0011] The electrochemical cell is formed by stacking a working electrode, a counter electrode, a separator, a working electrode current collecting material and a counter electrode current collecting material. The working electrode adsorbs and recovers the target gas. The counter electrode and the working electrode transmit and receive electrons. The separator is arranged between the working electrode and the counter electrode to prevent the physical contact between the working electrode and the counter electrode and to suppress electrical short circuit. The working electrode current collecting material abuts against the working electrode to electrically connect the working electrode and the counter electrode. The counter electrode current collecting material abuts against the counter electrode to electrically connect the working electrode and the counter electrode. The counter electrode surrounding component is configured to cover the counter electrode and the counter electrode current collecting material for the electrochemical cell, thereby suppressing the contact between the mixed gas and the counter electrode.

[0012] According to the gas recovery system, the counter electrode surrounding member arranged for the electrochemical cell suppresses contact between the mixed gas and the counter electrode. As a result, the gas recovery system can suppress oxidation of the counter electrode and suppress reduction in recovery capability of the recovery target gas in the gas recovery system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The above-mentioned object and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description with reference to the accompanying drawings.

[0014] Figure 1 It is a schematic diagram showing the overall structure of the carbon dioxide recovery system according to the first embodiment.

[0015] Figure 2 It is an explanatory diagram showing the structure of a carbon dioxide recovery device.

[0016] Figure 3 It is an explanatory diagram showing the structure of an electrochemical cell in a carbon dioxide recovery device.

[0017] Figure 4 It is an exploded perspective view of the electrochemical cell according to the first embodiment.

[0018] Figure 5 It is a cross-sectional view showing the structure of the electrochemical cell according to the first embodiment.

[0019] Figure 6 It is a cross-sectional view showing the structure of an electrochemical cell according to a second embodiment.

[0020] Figure 7 It is an exploded perspective view of an electrochemical cell according to a third embodiment.

[0021] Figure 8 It is a cross-sectional view showing the structure of an electrochemical cell according to a third embodiment.

[0022] Fig. 9 It is a cross-sectional view showing the structure of an electrochemical cell according to a fourth embodiment.

[0023] Fig.10 It is a cross-sectional view showing the structure of an electrochemical cell according to a fifth embodiment. DETAILED DESCRIPTION

[0024] Hereinafter, multiple methods for implementing the present disclosure will be described with reference to the accompanying drawings. In each embodiment, the same reference numerals are sometimes used to mark the parts corresponding to the matters described in the previous embodiment, and repeated descriptions are omitted. In the case where only a part of the structure is described in each embodiment, other embodiments described previously can be applied to the other parts of the structure. Not only are the combinations of the parts that can be combined specifically indicated in each embodiment, but the embodiments can also be partially combined with each other even if not indicated, as long as there is no particular hindrance to the combination.

[0025] (First Embodiment)

[0026] The first embodiment of the present disclosure will be described with reference to the drawings. In the first embodiment, the gas recovery system of the present disclosure is applied to a carbon dioxide recovery system 1 that separates and recovers carbon dioxide from a mixed gas containing carbon dioxide. Therefore, the recovery target gas of the present embodiment is carbon dioxide.

[0027] like Figure 1 As shown, the carbon dioxide recovery system 1 according to the first embodiment includes a carbon dioxide recovery device 10 , a pump 11 , a flow path switching valve 12 , a carbon dioxide utilization device 13 , and a control device 14 .

[0028] The carbon dioxide recovery device 10 separates carbon dioxide from the mixed gas and recovers it. The atmosphere and the exhaust gas of the internal combustion engine can be used as the mixed gas. The mixed gas also contains gases other than carbon dioxide. The mixed gas is supplied to the carbon dioxide recovery device 10. The carbon dioxide recovery device 10 discharges the mixed gas after the carbon dioxide is removed or the recovered carbon dioxide. The detailed structure of the carbon dioxide recovery device 10 is described later.

[0029] The outlet of the carbon dioxide recovery device 10 is connected to the suction port side of the pump 11. The pump 11 sucks the mixed gas from which carbon dioxide has been removed or the recovered carbon dioxide from the carbon dioxide recovery device 10. The mixed gas is supplied to the carbon dioxide recovery device 10 by the suction action of the pump 11.

[0030] In the present embodiment, an example is described in which the pump 11 is arranged downstream of the carbon dioxide recovery device 10 in the gas flow direction. However, the pump 11 may be arranged upstream of the carbon dioxide recovery device 10 in the gas flow direction.

[0031] The discharge port of the pump 11 is connected to the inlet side of the flow path switching valve 12. The flow path switching valve 12 is a three-way valve that switches the flow path of the gas flowing out of the carbon dioxide recovery device 10. One side of the flow outlet of the flow path switching valve 12 is connected to the atmosphere side, and the other side of the flow outlet of the flow path switching valve 12 is connected to the carbon dioxide utilization device 13 side. Therefore, the flow path switching valve 12 switches the flow path for the gas flowing out of the carbon dioxide recovery device 10 to flow to the atmosphere side and the flow path for the gas flowing out of the carbon dioxide recovery device 10 to flow to the carbon dioxide utilization device 13 side.

[0032] The carbon dioxide utilization device 13 is a device that utilizes carbon dioxide. For example, a storage tank for storing carbon dioxide or a conversion device that converts carbon dioxide into fuel can be used as the carbon dioxide utilization device 13. The conversion device is a device that converts carbon dioxide into hydrocarbon fuels such as methane. The hydrocarbon fuel can be a gaseous fuel at normal temperature and pressure, or a liquid fuel at normal temperature and pressure.

[0033] The control device 14 is composed of a well-known microcomputer including a CPU, a ROM, a RAM, etc. and its peripheral circuits. The control device 14 performs various calculations and processes based on the control program stored in the ROM to control the operation of various control target devices connected to the output side. More specifically, the control device 14 of this embodiment controls the operation of the carbon dioxide recovery device 10, the pump 11, and the flow path switching valve 12.

[0034] Next, use Figure 2 , Figure 3 The structure of the carbon dioxide recovery device 10 used in the carbon dioxide recovery system 1 is described. Figure 2 As shown, the carbon dioxide recovery device 10 includes a housing 100 and a plurality of electrochemical cells 101. The housing 100 of this embodiment is formed of a metal material. The housing 100 may also be formed of a resin material.

[0035] The housing 100 has a gas inlet and a gas outlet. The gas inlet is an opening for allowing the mixed gas to flow into the housing 100. The gas outlet is an opening for allowing the mixed gas from which carbon dioxide has been removed or the recovered carbon dioxide to flow out of the housing 100.

[0036] The electrochemical cell 101 absorbs carbon dioxide through an electrochemical reaction, separates carbon dioxide from the mixed gas, and recovers it. In addition, the electrochemical cell 101 desorbs carbon dioxide through an electrochemical reaction, and releases the absorbed carbon dioxide. A plurality of electrochemical cells 101 are accommodated in the housing 100 .

[0037] The electrochemical cell 101 is formed in a rectangular flat plate shape. A plurality of electrochemical cells 101 are stacked and arranged inside the housing 100 with their plate surfaces parallel to each other at a certain interval.

[0038] A plurality of gas flow paths 102 for flowing the mixed gas flowing from the gas inlet are formed between adjacent electrochemical cells 101. Therefore, the mixed gas flows in parallel with the plate surface of the electrochemical cell 101 and perpendicular to the stacking direction of the plurality of electrochemical cells 101.

[0039] like Figure 3 As shown, the electrochemical cell 101 has a working electrode current collecting material 103, a working electrode 104, a counter electrode current collecting material 105, a counter electrode 106, a separator 107 and an electrolyte layer 108. The working electrode current collecting material 103, the working electrode 104, the counter electrode current collecting material 105, the counter electrode 106 and the separator 107 are all formed into rectangular flat plates.

[0040] The electrochemical cell 101 is formed as a stacked body formed by stacking the working electrode current collecting material 103, the working electrode 104, the counter electrode current collecting material 105, the counter electrode 106, and the separator 107. The stacking direction of the working electrode current collecting material 103 and the like in each electrochemical cell 101 is consistent with the stacking direction of the plurality of electrochemical cells 101 stacked inside the frame 100.

[0041] The working electrode current collector 103 is a conductive component that contacts the working electrode 104 and electrically connects the working electrode 104 and the counter electrode 106. Figure 4 As shown in FIG. 1 and FIG. 2 , a working electrode side lead portion 103 a is formed on the working electrode current collecting material 103 , and the working electrode side lead portion 103 a is connected to a power source 109 via the working electrode side lead portion 103 a .

[0042] One flat surface of the working electrode collector 103 is exposed to the mixed gas. The other flat surface of the working electrode collector 103 is in contact with the working electrode 104. The working electrode collector 103 has a plurality of working electrode openings 103b formed therein so that the mixed gas on one flat surface is exposed to the working electrode 104 on the other flat surface.

[0043] Specifically, the working electrode current collector material 103 of the present embodiment is formed of a metal porous body. Therefore, the working electrode opening 103b of the present embodiment is formed by a plurality of voids formed inside the working electrode current collector material 103 being interconnected. A metal porous body having a porosity of 50% or more can be used as the working electrode current collector material 103. The porosity is defined by the ratio of the volume of the voids to the volume of the appearance.

[0044] The working electrode 104 can adsorb carbon dioxide from the mixed gas and recover it, and desorb and release the recovered carbon dioxide. The working electrode 104 has a carbon dioxide adsorbent, a conductive aid, and a binder. The carbon dioxide adsorbent, the conductive aid, and the binder are used in a mixed state. More specifically, the fine particles of the carbon dioxide adsorbent and the fine particles of the conductive aid are used in a state held by the binder.

[0045] The carbon dioxide adsorbent is an electroactive species that adsorbs carbon dioxide by accepting electrons and desorbs the adsorbed carbon dioxide by releasing electrons. For example, polyanthraquinone can be used as the carbon dioxide adsorbent.

[0046] The conductive agent forms a conductive path to the carbon dioxide adsorbent. For example, carbon materials such as carbon nanotubes, carbon black, and graphene can be used as the conductive agent.

[0047] The binder is a binding agent that holds the carbon dioxide adsorbent and the conductive aid. For example, a conductive resin of a high molecular polymer can be used as the binder. An organic substance such as an epoxy resin containing Ag or the like as a conductive filler, a fluororesin such as polytetrafluoroethylene (PTFE), and polyvinylidene fluoride (PVDF) can be used as the conductive resin.

[0048] The counter electrode current collector 105 is a conductive member that contacts the counter electrode 106 to electrically connect the working electrode 104 and the counter electrode 106. Figure 4 As shown in FIG. 1 , a counter electrode side lead portion 105a is formed on the counter electrode current collector 105, and the counter electrode side lead portion 105a is connected to the power source 109. One flat surface of the counter electrode current collector 105 is exposed to the mixed gas. The other flat surface of the counter electrode current collector 105 is in contact with the counter electrode 106.

[0049] The counter electrode 106 transmits and receives electrons with the working electrode 104 when the carbon dioxide adsorbent adsorbs or desorbs carbon dioxide. The counter electrode 106 has an electroactive auxiliary material, a conductive auxiliary agent, and a binder. The electroactive auxiliary material, the conductive auxiliary agent, and the binder are used in a mixed state. More specifically, in this embodiment, fine particles of the electroactive auxiliary material and the fine particles of the conductive auxiliary agent are used in a state held by a binder.

[0050] The basic structure of the conductive auxiliary agent and the binder of the counter electrode 106 is the same as that of the conductive auxiliary agent and the binder of the working electrode 104. The electroactive auxiliary material is an auxiliary electroactive species that performs electron transmission and reception between the carbon dioxide adsorbent of the working electrode 104, and is an active substance with redox properties. As the active substance, an organic compound having a π bond, a transition metal compound having multiple oxidation numbers, and a metal complex that can transmit and receive electrons by changing the valence of metal ions can be used.

[0051] Examples of such metal complexes include cyclopentadienyl metal complexes such as ferrocene, nickelocene, and cobaltocene, and porphyrin metal complexes, etc. These metal complexes may be polymers or monomers.

[0052] The separator 107 is disposed between the working electrode 104 and the counter electrode 106 to separate the working electrode 104 from the counter electrode 106. The separator 107 is an insulating ion permeable membrane that prevents physical contact between the working electrode 104 and the counter electrode 106, suppresses electrical short circuits, and allows ions to pass through. As the separator 107, a cellulose membrane, a polymer, a composite material of a polymer and ceramics, etc. can be used.

[0053] The electrolyte layer 108 is an impregnation layer in which the working electrode 104, the separator 107, and the counter electrode 106 are impregnated. For example, an ionic liquid can be used as the electrolyte layer 108. The ionic liquid is a liquid salt having non-volatility at normal temperature and pressure.

[0054] Furthermore, a power source 109 is connected to the working electrode current collector 103 and the counter electrode current collector 105 of the electrochemical cell 101. The power source 109 applies a predetermined voltage to the working electrode 104 and the counter electrode 106, and can change the potential difference between the working electrode 104 and the counter electrode 106. The working electrode 104 is a negative electrode, and the counter electrode 106 is a positive electrode.

[0055] The electrochemical cell 101 operates in a carbon dioxide recovery mode for recovering carbon dioxide through the working electrode 104 and a carbon dioxide release mode for releasing carbon dioxide from the working electrode 104 by changing the potential difference between the working electrode 104 and the counter electrode 106. The carbon dioxide recovery mode is a charging mode for charging the electrochemical cell 101, and the carbon dioxide release mode is a discharge mode for discharging the electrochemical cell 101.

[0056] Specifically, in the carbon dioxide recovery mode, a first voltage V1 is applied between the working electrode 104 and the counter electrode 106, and electrons are supplied from the counter electrode 106 to the working electrode 104. In the first voltage V1, the working electrode potential < the counter electrode potential. The first voltage V1 can be set within a range of 0.5 to 2.0V, for example.

[0057] In the carbon dioxide release mode, a second voltage V2 is applied between the working electrode 104 and the counter electrode 106, and electrons are supplied from the working electrode 104 to the counter electrode 106. The second voltage V2 is a voltage different from the first voltage V1. As long as the second voltage V2 is a voltage lower than the first voltage V1, the magnitude relationship between the working electrode potential and the counter electrode potential is not limited. In other words, in the carbon dioxide release mode, the working electrode potential can be < the counter electrode potential, the working electrode potential can be = the counter electrode potential, and the working electrode potential can be > the counter electrode potential.

[0058] Next, the operation of the carbon dioxide recovery system 1 will be described. As described above, the carbon dioxide recovery system 1 operates by switching between the carbon dioxide recovery mode and the carbon dioxide release mode alternately. The operation of the carbon dioxide recovery system 1 is controlled by the control device 14 .

[0059] First, the operation of the carbon dioxide recovery system 1 in the carbon dioxide recovery mode is described. In the carbon dioxide recovery mode, the pump 11 is operated. Thus, the mixed gas is supplied to the carbon dioxide recovery device 10. In the carbon dioxide recovery device 10, the voltage applied between the working electrode 104 and the counter electrode 106 of the electrochemical cell 101 is set to a first voltage V1. Thus, the electron donation of the electroactive auxiliary material of the counter electrode 106 and the electron withdrawal of the carbon dioxide adsorbent material of the working electrode 104 can be achieved simultaneously.

[0060] The carbon dioxide adsorbent of the working electrode 104 that receives electrons from the counter electrode 106 has a higher carbon dioxide binding force, and binds and adsorbs carbon dioxide contained in the mixed gas. Thus, the carbon dioxide recovery device 10 can recover carbon dioxide from the mixed gas. The mixed gas from which carbon dioxide has been removed is discharged from the carbon dioxide recovery device 10.

[0061] In the carbon dioxide recovery mode, the flow path switching valve 12 switches the flow path so that the mixed gas exhausted from the carbon dioxide recovery device 10 flows toward the atmosphere. Thus, the mixed gas exhausted from the carbon dioxide recovery device 10 is exhausted to the atmosphere.

[0062] Next, the operation of the carbon dioxide recovery system 1 in the carbon dioxide release mode is described. In the carbon dioxide release mode, the pump 11 is stopped. As a result, the supply of the mixed gas to the carbon dioxide recovery device 10 is stopped. In the carbon dioxide recovery device 10, the voltage applied between the working electrode 104 and the counter electrode 106 of the electrochemical cell 101 is set to the second voltage V2. As a result, the electron donation of the carbon dioxide adsorbent material of the working electrode 104 and the electron withdrawal of the electroactive auxiliary material of the counter electrode 106 can be achieved simultaneously.

[0063] The carbon dioxide adsorbent of the working electrode 104 releases electrons and becomes oxidized. The carbon dioxide adsorbent's carbon dioxide binding force decreases, and carbon dioxide is desorbed and released. The carbon dioxide released from the carbon dioxide adsorbent is discharged from the carbon dioxide recovery device 10.

[0064] In the carbon dioxide release mode, the flow path switching valve 12 switches the flow path so that the carbon dioxide exhausted from the carbon dioxide recovery device 10 flows toward the inlet side of the carbon dioxide utilization device 13. Thus, the carbon dioxide exhausted from the carbon dioxide recovery device 10 is supplied to the carbon dioxide utilization device 13.

[0065] As described above, according to the carbon dioxide recovery system 1 of the present embodiment, carbon dioxide can be recovered from the mixed gas and the recovered carbon dioxide can be effectively utilized.

[0066] Next, the manufacturing method of the electrochemical cell 101 is described. The manufacturing method of the electrochemical cell 101 of the present embodiment includes a current collecting material attaching step of attaching the working electrode 104 to the working electrode side of the working electrode current collecting material 103, and a current collecting material attaching step of attaching the counter electrode 106 to the counter electrode side of the counter electrode current collecting material 105. The current collecting material attaching step on the working electrode side and the current collecting material attaching step on the counter electrode side can be performed separately.

[0067] The current collecting material attaching process on the working electrode side is substantially the same as the current collecting material attaching process on the counter electrode side. Therefore, first, the current collecting material attaching process on the working electrode side is described. In the current collecting material attaching process on the working electrode side, a preparation process, a coating process, a drying process, and a stripping process are performed. In the preparation process, the working electrode current collecting material 103 is arranged on a release paper arranged on a plane. The release paper is a release paper used in a molding process of temporarily displaying an adhesive substance.

[0068] In the coating step, the upper surface of the working electrode current collector material 103 after the preparation step, that is, the surface on the opposite side of the release paper, is coated by screen printing or the like to mix the carbon dioxide adsorbent, the conductive auxiliary agent and the binder to form a paste-like working electrode 104. Thus, the paste-like working electrode 104 is not only coated on the upper surface of the working electrode current collector material 103, but also enters the inside of the working electrode opening 103b.

[0069] In the drying process, the working electrode 104 coated on the working electrode current collector material 103 after the coating process is dried. Thus, the working electrode 104 is solidified. Therefore, the working electrode 104 is formed by solidifying the fine particles of the carbon dioxide adsorbent material and the fine particles of the conductive auxiliary agent together with the binder. In the drying process, in order to speed up the drying speed, the working electrode current collector material 103 and the working electrode 104 may also be heated. In addition, the working electrode current collector material 103 and the working electrode 104 may also be arranged in a low pressure environment.

[0070] In the peeling step, the release paper is peeled off from the working electrode current collector 103. In the peeling step, when the release paper is peeled off from the working electrode current collector 103, a part of the working electrode 104 is peeled off together with the release paper, and there is a possibility that a part of the working electrode 104 is damaged. Therefore, in the peeling step, it is preferable to peel off the release paper so that the working electrode 104 is not damaged.

[0071] Through the above steps, in the current collecting material attaching step on the working electrode side, the working electrode 104 is attached to the working electrode current collecting material 103. In the current collecting material attaching step on the counter electrode side for attaching the counter electrode 106 to the counter electrode current collecting material 105, the same preparation step, coating step, drying step, and stripping step are performed.

[0072] Then, a laminating step is performed to laminate the working electrode current collector material 103 and the working electrode 104 attached by the current collector material attaching step on the working electrode side and the counter electrode current collector material 105 and the counter electrode 106 attached by the current collector material attaching step on the counter electrode side, with the separator 107 interposed therebetween. Figure 3 , Figure 4 It can be seen that the surface on the working electrode 104 side and the surface on the counter electrode 106 side are bonded to the separator 107 in such a manner that they are in contact with each other.

[0073] Then, the power source 109 is connected to the working electrode side lead-out portion 103a of the working electrode current collecting material 103 and the counter electrode side lead-out portion 105a of the counter electrode current collecting material 105. Thus, the electrochemical cell 101 is manufactured.

[0074] In the carbon dioxide recovery system 1 according to the first embodiment, the electrochemical cell manufactured in this manner is provided with the counter electrode surrounding member 110. In the first embodiment, as the counter electrode surrounding member 110, a membrane member 111 made of a gas-impermeable material is used.

[0075] When the membrane member 111 is disposed on the electrochemical cell 101 , the operation of disposing the working electrode side membrane 112 and the counter electrode side membrane 113 is performed under a reduced pressure environment or an inert gas environment.

[0076] Specifically, if Figure 4 As shown in FIG. 1 , as the membrane member 111, a working electrode side membrane 112 and a counter electrode side membrane 113 are arranged on the electrochemical cell 101. Figure 5 As shown, the working electrode side membrane 112 and the counter electrode side membrane 113 are arranged to surround the electrochemical cell 101 so as to house the electrochemical cell 101 therein.

[0077] The working electrode side film 112 is a film member 111 disposed so as to cover the working electrode side of the electrochemical cell 101. The working electrode side film 112 is disposed so as to be in close contact with the surfaces of the working electrode current collector 103 and the working electrode 104 in the electrochemical cell 101.

[0078] The working electrode side film 112 is formed to be larger than the working electrode side of the electrochemical cell 101 and has an opening 112a in the center. The opening 112a of the working electrode side film 112 has the same size as the working electrode 104 and is formed to expose the mixed gas to the working electrode 104.

[0079] On the other hand, the counter electrode side film 113 is a film member 111 disposed to cover the counter electrode side of the electrochemical cell 101. The counter electrode side film 113 is disposed to be in close contact with the surfaces of the counter electrode current collector 105 and the counter electrode 106 in the electrochemical cell 101.

[0080] Furthermore, the outer periphery of the working electrode side film 112 is bonded to the outer periphery of the counter electrode side film 113 over the entire periphery. Figure 5 As shown, the electrochemical cell 101 is arranged inside the space formed by the working electrode side membrane 112 and the counter electrode side membrane 113. Since the working electrode side membrane 112 and the counter electrode side membrane 113 are gas impermeable, the space in which the electrochemical cell 101 is arranged becomes difficult for the mixed gas to flow out or in except for the opening 112a.

[0081] Therefore, according to the first embodiment, the counter electrode surrounding member 110 composed of the working electrode side film 112 and the counter electrode side film 113 covers the electrochemical cell 101 , thereby suppressing the contact between the mixed gas and the counter electrode current collecting material 105 and the counter electrode 106 .

[0082] Here, a case where a mixed gas including oxygen gas is in contact with the counter electrode 106 is studied. When the mixed gas includes oxygen gas, the oxygen gas in contact with the counter electrode 106 receives electrical energy to generate active oxygen species such as peroxide.

[0083] Such active oxygen species easily oxidize the electroactive auxiliary material and the binder formed of the organic processed material in the counter electrode 106. Moreover, if the electroactive auxiliary material is oxidized, the electron receiving and sending capability of the electroactive auxiliary material is reduced. In addition, if the binder is oxidized, the electroactive auxiliary material cannot be stopped. As a result, the recovery capability of the carbon dioxide in the working electrode 104 may be reduced.

[0084] In this regard, in the carbon dioxide recovery system 1 according to the first embodiment, the electrochemical cell 101 is surrounded by the working electrode side membrane 112 and the counter electrode side membrane 113 as the counter electrode surrounding member 110, so that the counter electrode 106 is not easily exposed to the mixed gas. Therefore, it is possible to suppress oxidation of the electroactive auxiliary material and the binder of the counter electrode 106, and suppress reduction in the recovery capacity of the recovery target gas in the carbon dioxide recovery system 1.

[0085] Furthermore, when selecting a material that can be used as the membrane component 111, the following points are preferably considered: First, in the first embodiment, in order to bond the outer peripheries of the working electrode side membrane 112 and the counter electrode side membrane 113, a material or characteristic corresponding to the sealing method at the outer periphery is required.

[0086] For example, when the outer periphery is sealed by thermal compression welding (hot plate welding), laser welding, ultrasonic welding, etc., thermoplasticity is required, and a structure having a surface layer or film of, for example, polypropylene, nylon, polyvinyl chloride, etc. can be adopted.

[0087] In addition, when the outer periphery is sealed by bonding with an adhesive, the film member 111 is preferably in a state where the wettability of the adhesive is good (i.e., a state where the surface energy is large) or a rough surface. For example, a state suitable for bonding with an adhesive can be produced by performing laser sandblasting, plasma treatment, etc. A structure having a surface layer or a film of polyvinyl chloride, nylon, polyethylene terephthalate, etc. can be made into a structure suitable for bonding with an adhesive.

[0088] Furthermore, as described above, the membrane member 111 needs to be gas impermeable. In other words, the membrane member 111 is preferably a material or structure having gas barrier properties. For example, the membrane member 111 may be a structure having a metal vapor-deposited layer such as aluminum or copper, a metal foil layer such as aluminum, or a resin layer having difficulty in permeability such as polyvinylidene chloride.

[0089] As described above, according to the carbon dioxide recovery system 1 involved in the first embodiment, the electrochemical cell 101 is covered with the working electrode side film 112 and the counter electrode side film 113 as the counter electrode surrounding member 110, so that the counter electrode 106 is not easily exposed to the mixed gas. As a result, the carbon dioxide recovery system 1 can suppress the oxidation of the electroactive auxiliary material and the binder of the counter electrode 106, and suppress the reduction of the recovery capacity of the recovery target gas in the carbon dioxide recovery system 1.

[0090] (Second Embodiment)

[0091] Next, refer to Figure 6 A second embodiment different from the above embodiment will be described. In the second embodiment, the film member 111 arranged as the counter electrode surrounding member 110 is arranged differently relative to the electrochemical cell 101. The other basic structures are the same as those of the above embodiment, and thus repeated description is omitted.

[0092] In the carbon dioxide recovery system 1 according to the second embodiment, the electrochemical cell 101 is constructed by stacking a working electrode current collecting material 103 , a working electrode 104 , a separator 107 , a counter electrode 106 , and a counter electrode current collecting material 105 in this order, similarly to the above-mentioned embodiment.

[0093] like Figure 6 As shown, in the electrochemical cell 101 according to the second embodiment, a counter electrode side film 113 as a film member 111 is arranged as a counter electrode surrounding member 110. In addition, the separator 107 in the second embodiment is made of a material having weldability with respect to the counter electrode side film 113, and is configured to have a larger size than the counter electrode current collecting material 105 and the counter electrode 106. Therefore, in the electrochemical cell 101 according to the second embodiment, the outer peripheral edge of the separator 107 is arranged closer to the outside than the outer edges of the counter electrode current collecting material 105 and the counter electrode 106.

[0094] The counter electrode side film 113 according to the second embodiment is arranged to cover the counter electrode side of the electrochemical cell 101 and is in close contact with the surfaces of the counter electrode current collector 105 and the counter electrode 106. The outer periphery of the counter electrode side film 113 is bonded to the outer periphery of the separator 107 by welding over the entire periphery.

[0095] In addition, the bonding method of the electrode side film 113 and the separator 107 is not limited to welding, and various methods such as welding, chemical bonding, and physical bonding can be used. In addition, when bonding the electrode side film 113 and the separator 107, other structures can also be used. For example, the electrode side film 113 and the separator 107 can also be bonded via an adhesive. In addition, the characteristics required as the constituent material of the electrode side film 113 are the same as those of the first embodiment.

[0096] like Figure 6 As shown, in the second embodiment, the counter electrode current collector 105 and the counter electrode 106 are covered by a gas-impermeable counter electrode side film 113, which is bonded to the outer periphery of the separator 107. Therefore, the space between the separator 107 and the counter electrode side film 113 does not allow the mixed gas to flow into.

[0097] In the second embodiment, the bonding operation of the counter electrode side film 113 and the separator 107 is performed under a reduced pressure environment or an inert gas environment. Therefore, the space between the separator 107 and the counter electrode side film 113 does not contain the mixed gas from the initial state.

[0098] According to the carbon dioxide recovery system 1 involved in the second embodiment, the counter electrode current collecting material 105 and the counter electrode 106 are divided by the counter electrode side membrane 113 and the separator 107, and the contact of the mixed gas with the counter electrode 106 can be prohibited. Therefore, the carbon dioxide recovery system 1 involved in the second embodiment can suppress the oxidation of the electroactive auxiliary material and the binder of the counter electrode 106 with a small number of parts, and suppress the reduction of the recovery capacity of the recovery target gas in the carbon dioxide recovery system 1.

[0099] As described above, according to the carbon dioxide recovery system 1 involved in the second embodiment, when it is divided into the counter electrode current collecting material 105 and the counter electrode 106 by the separator 107 and the counter electrode side membrane 113, the effects achieved by the same structure and operation as the above embodiment can be obtained.

[0100] like Figure 6 As shown, by bonding the counter electrode side film 113 to the separator 107, the counter electrode current collector 105 and the counter electrode 106 can be isolated from the mixed gas, thereby suppressing the degradation of the counter electrode 106 and the associated reduction in the recovery capacity of the recovery target gas with a smaller number of components.

[0101] (Third Embodiment)

[0102] Next, refer to Figure 7 , Figure 8A third embodiment different from the above-mentioned embodiment is described. In the third embodiment, a working electrode side film 112 and a counter electrode side film 113 are used as the counter electrode surrounding member 110 to suppress the degradation of the counter electrode 106 and ensure the close contact of the components of the electrochemical cell 101. The other basic structures are the same as those of the above-mentioned embodiment, so the re-description is omitted.

[0103] like Figure 7 , Figure 8 As shown, in the carbon dioxide recovery system 1 involved in the third embodiment, the electrochemical cell 101 is constructed by stacking a working electrode collector material 103, a working electrode 104, an insulator 107, a counter electrode 106, and a counter electrode collector material 105 in this order, as in the above-mentioned embodiment.

[0104] A plurality of holes 107a are formed in the separator 107 of the electrochemical cell 101 according to the third embodiment. In the separator 107 according to the third embodiment, the plurality of holes 107a are arranged along the outer periphery of the separator 107 and penetrate the separator 107 in the thickness direction.

[0105] The separator 107 is formed to be larger than the working electrode current collector 103, the working electrode 104, the counter electrode current collector 105, and the counter electrode 106. In addition, the plurality of holes 107a are formed to be located closer to the outside than the outer edges of the working electrode current collector 103, the working electrode 104, the counter electrode current collector 105, and the counter electrode 106.

[0106] In addition, as the constituent material of the separator 107, in the second embodiment, a material having weldability to the membrane member 111 is used, but in the third embodiment, weldability to the membrane member 111 is not required. In the third embodiment, the separator 107 can be composed of various materials as long as it is a material that can prevent physical contact between the working electrode 104 and the counter electrode 106 and suppress electrical short circuit.

[0107] like Figure 7 , Figure 8 As shown, in the electrochemical cell 101 according to the third embodiment, a working electrode side membrane 112 and a counter electrode side membrane 113 are arranged as a counter electrode surrounding member 110 .

[0108] The working electrode side film 112 is a film member 111 arranged to cover the working electrode side of the electrochemical cell 101 as in the above embodiment. The working electrode side film 112 is arranged to be in close contact with the surfaces of the working electrode current collector 103 and the working electrode 104 in the electrochemical cell 101.

[0109] The working electrode side film 112 is formed to be larger than the working electrode side of the electrochemical cell 101 and has an opening 112a in the center. The opening 112a of the working electrode side film 112 is opened to the same size as the working electrode 104 and is formed to expose the mixed gas to the working electrode 104.

[0110] like Figure 8 As shown, the outer periphery of the working electrode side film 112 is located outside the outer peripheries of the working electrode current collector 103 and the working electrode 104 , and outside the outer periphery of the separator 107 .

[0111] The counter electrode side film 113 according to the third embodiment is a film member 111 arranged to cover the counter electrode side of the electrochemical cell 101. The counter electrode side film 113 is arranged to be in close contact with the surfaces of the counter electrode current collector 105 and the counter electrode 106 in the electrochemical cell 101.

[0112] like Figure 8 As shown, the outer periphery of the counter electrode side film 113 is located outside the outer peripheries of the counter electrode current collector 105 and the counter electrode 106 , and outside the outer periphery of the separator 107 .

[0113] In the third embodiment, the working electrode side film 112 and the counter electrode side film 113 are bonded by welding inside the plurality of holes 107a formed in the separator 107. Thus, the relative positional relationship among the working electrode side film 112, the counter electrode side film 113, and the separator 107 is fixed. Furthermore, in the third embodiment, the outer periphery of the working electrode side film 112 and the outer periphery of the counter electrode side film 113 are welded over the entire periphery outside the outer periphery of the separator 107.

[0114] That is, the counter electrode current collector 105 and the counter electrode 106 are covered by the gas-impermeable counter electrode side film 113 and bonded to the working electrode side film 112 through the hole 107a of the separator 107. Therefore, the mixed gas can be prevented from flowing into the space between the separator 107 and the counter electrode side film 113.

[0115] In addition, similar to the above-mentioned embodiment, the arrangement of the working electrode side film 112 and the counter electrode side film 113 relative to the electrochemical cell 101 is performed under a reduced pressure environment or an inert gas environment. Therefore, the space between the separator 107 and the counter electrode side film 113 does not contain the mixed gas from the initial state.

[0116] According to the carbon dioxide recovery system 1 involved in the third embodiment, the counter electrode current collecting material 105 and the counter electrode 106 are divided by the working electrode side membrane 112, the counter electrode side membrane 113, and the separator 107, and the contact of the mixed gas with the counter electrode 106 can be prohibited. Therefore, the carbon dioxide recovery system 1 involved in the third embodiment can suppress the oxidation of the electroactive auxiliary material and the binder of the counter electrode 106, and suppress the reduction of the recovery capacity of the recovery target gas in the carbon dioxide recovery system 1.

[0117] In addition, if Figure 8 As shown, the working electrode side film 112 and the counter electrode side film 113 are welded inside the plurality of holes 107 a , so that the relative positional relationship among the separator 107 , the working electrode side film 112 , and the counter electrode side film 113 can be fixed.

[0118] That is, between the separator 107 and the working electrode side film 112 , pressure in the stacking direction can be applied to the working electrode current collector 103 and the working electrode 104 , thereby improving the adhesion of the constituent members on the working electrode side of the electrochemical cell 101 .

[0119] Similarly, between the separator 107 and the counter electrode side film 113, pressure can be applied to the counter electrode current collector 105 and the counter electrode 106 in the stacking direction, which can improve the adhesion of the components on the counter electrode side of the electrochemical cell 101. That is, in the carbon dioxide recovery system 1 involved in the third embodiment, by using the separator 107, the working electrode side film 112, and the counter electrode side film 113, the adhesion of the components of the electrochemical cell 101 arranged inside can be improved.

[0120] In addition, the properties required of the working electrode side film 112 and the counter electrode side film 113 in the third embodiment are the same as those in the above-mentioned embodiment. In the third embodiment, it is necessary to apply pressure in the stacking direction by the electrochemical cell 101 through the separator 107, the working electrode side film 112, and the counter electrode side film 113.

[0121] Therefore, the working electrode side film 112 and the counter electrode side film 113 of the third embodiment preferably have mechanical strength to maintain the electrochemical cell 101. For example, by having a plastic layer such as polyethylene and a structure capable of stamping, the working electrode side film 112 and the counter electrode side film 113 can have mechanical strength.

[0122] As described above, according to the carbon dioxide recovery system 1 involved in the third embodiment, even when using the working electrode side membrane 112 and the counter electrode side membrane 113 as the counter electrode surrounding member 110, the effects achieved by the same structure and operation as the above-mentioned embodiment can be obtained.

[0123] In the third embodiment, the working electrode side film 112 and the counter electrode side film 113 are welded inside the plurality of holes 107a formed in the separator 107, and the relative positional relationship among the separator 107, the working electrode side film 112, and the counter electrode side film 113 is maintained. Thus, pressure can be applied in the stacking direction to the electrochemical cell 101 disposed inside the space formed by the working electrode side film 112 and the counter electrode side film 113, and the adhesion of the components of the electrochemical cell 101 can be improved.

[0124] (Fourth Embodiment)

[0125] Next, refer to Fig. 9 A fourth embodiment different from the above embodiment will be described. In the fourth embodiment, a housing container 115 and a resin 116 are used as the counter electrode surrounding member 110. The other basic structures are the same as those of the above embodiment, and thus repeated descriptions are omitted.

[0126] like Fig. 9 As shown, in the carbon dioxide recovery system 1 involved in the fourth embodiment, the electrochemical cell 101 is constructed by stacking the working electrode collector material 103, the working electrode 104, the separator 107, the counter electrode 106, and the counter electrode collector material 105 in this order, as in the above-mentioned embodiment.

[0127] In the carbon dioxide recovery system 1 according to the fourth embodiment, the storage container 115 and the resin 116 are used as the counter electrode surrounding member 110. Fig. 9 As shown, the storage container 115 is formed into a surface (in Fig. 9 The storage container 115 is formed of a gas-impermeable material and is formed so as to be able to accommodate the electrochemical cell 101 therein.

[0128] The electrochemical cell 101 is arranged inside the storage container 115. One side of the counter electrode 106 of the electrochemical cell 101 is in contact with the bottom surface of the storage container 115, and the working electrode 104 side is exposed.

[0129] like Fig. 9 As shown, resin 116 is disposed inside container 115 in a space between the inner surface of container 115 and electrochemical cell 101. Resin 116 is a gas-impermeable resin material and fills the space between container 115 and electrochemical cell 101 by resin potting.

[0130] The following points can be listed as the material or characteristics required for the resin 116 filled by resin potting. First, in order to seal the working electrode 104 and the counter electrode 106 at the same time, the resin 116 can be listed as having electrical insulation. In addition, in order to achieve resin potting, the resin 116 can be listed as having fluidity and curability. Furthermore, in order to make the electrochemical cell 101 stay in the storage container 115, the resin 116 can be listed as having adhesion to the storage container 115 as other counter electrode surrounding parts 110. As examples of the resin 116 that meets these conditions, two-component curing epoxy resin and two-component curing silicone resin can be listed.

[0131] The amount of the resin 116 filled in the storage container 115 by resin potting is determined to cover the counter electrode 106 of the electrochemical cell 101 disposed therein and the surface of the counter electrode current collector 105 and to keep the working electrode 104 exposed from the resin 116. The resin 116 filled in the storage container 115 by resin potting is cured, thereby completing the arrangement of the counter electrode surrounding member 110 according to the fourth embodiment relative to the electrochemical cell 101.

[0132] Furthermore, the placement of the electrochemical cell 101 in the storage container 115 and the resin potting of the storage container 115 are performed in a reduced pressure environment or an inert gas environment.

[0133] like Fig. 9 As shown, the electrochemical cell 101 according to the fourth embodiment covers at least the counter electrode current collector 105 and the counter electrode 106 by the housing container 115 as the counter electrode surrounding member 110 and the resin 116. Therefore, the mixed gas can be prevented from flowing into the space formed between the housing container 115 and the electrochemical cell 101.

[0134] According to the carbon dioxide recovery system 1 involved in the fourth embodiment, the contact of the mixed gas with the counter electrode 106 can be prohibited by covering the counter electrode current collector 105 and the counter electrode 106 with the storage container 115 and the resin 116. Therefore, the carbon dioxide recovery system 1 involved in the fourth embodiment can suppress the oxidation of the electroactive auxiliary material and the binder of the counter electrode 106, and suppress the reduction of the recovery capacity of the recovery target gas in the carbon dioxide recovery system 1.

[0135] As described above, according to the carbon dioxide recovery system 1 according to the fourth embodiment, even when the storage container 115 is used as the counter electrode surrounding member 110 , the same operational effects as those of the above-described embodiments can be obtained by the configuration and operation.

[0136] By placing the electrochemical cell 101 inside the storage container 115 and prohibiting the mixed gas from flowing into the storage container 115 , oxidation of the electroactive auxiliary material and the binder of the counter electrode 106 can be suppressed.

[0137] In addition, the space between the storage container 115 and the electrochemical cell 101 is filled with a gas-impermeable resin 116, thereby reliably preventing the mixed gas from contacting the counter electrode current collector 105 and the counter electrode 106 of the electrochemical cell 101. Therefore, the carbon dioxide recovery system 1 involved in the fourth embodiment can suppress the reduction of the recovery capacity of the recovery target gas in the carbon dioxide recovery system 1.

[0138] In the fourth embodiment, the housing container 115 as the counter electrode surrounding member 110 is made of resin, but the present invention is not limited to this embodiment. The housing container 115 can be made of various materials as long as the material thereof is gas impermeable, and metal may be used, for example.

[0139] In addition, in the fourth embodiment, as the counter electrode surrounding member 110, as a member used together with the storage container 115, a resin 116 filled by resin potting is used, but it is not limited to this method. As long as the inflow and outflow of the mixed gas relative to the inside of the storage container 115 can be suppressed, various members and methods can be used. For example, a gas-impermeable membrane member 111 can also be configured to seal the opening edge of the storage container 115 and the electrochemical cell 101 to suppress the inflow and outflow of the mixed gas relative to the space generated between the counter electrode 106 and the inside of the storage container 115.

[0140] (Fifth Embodiment)

[0141] Next, refer to Fig.10 A fifth embodiment different from the above-mentioned embodiment will be described. In the fifth embodiment, a counter-electrode surrounding member 110 different from that in the above-mentioned embodiment is adopted. The other basic structures and the like are the same as those in the above-mentioned embodiment, and thus repeated descriptions thereof will be omitted.

[0142] In the carbon dioxide recovery system 1 according to the fifth embodiment, the electrochemical cell 101 is constructed by stacking a working electrode current collecting material 103, a working electrode 104, a separator 107, a counter electrode 106, and a counter electrode current collecting material 105 in this order, similarly to the above-mentioned embodiments.

[0143] like Fig.10As shown, in the carbon dioxide recovery system 1 according to the fifth embodiment, a resin 116 is used as the counter electrode surrounding member 110. The resin 116 in the fifth embodiment is arranged on the electrochemical cell 101 by molding.

[0144] Specifically, an example of a step of placing the resin 116 on the electrochemical cell 101 by molding is described. First, a metal mold having a space large enough to accommodate the electrochemical cell 101 is prepared. Next, the electrochemical cell 101 is placed inside the space formed in the metal mold with the counter electrode side facing downward.

[0145] The resin 116 as the counter electrode surrounding member 110 is injected into the metal mold in which the electrochemical cell 101 is arranged. The resin 116 has thermoplasticity and gas impermeability, and is injected into the space in a fluid state. The amount of the resin 116 injected into the space is determined to cover the surface of the counter electrode 106 and the counter electrode current collector 105 and keep the working electrode 104 exposed from the resin 116.

[0146] After a predetermined amount of resin 116 is injected into the space of the metal mold, the metal mold is cooled to solidify the resin 116 in the space. Fig.10 As shown, the electrochemical cell 101 provided with the resin 116 is taken out from the metal mold, and the molding process is completed.

[0147] Furthermore, the molding process of the resin 116 with respect to the electrochemical cell 101 is preferably performed under a reduced pressure environment or an inert gas environment.

[0148] In the fifth embodiment, by implementing the above-mentioned molding process, it is possible to obtain an electrochemical cell 101 in which the resin 116 is arranged as the counter electrode surrounding member 110. The resin 116 covers at least the counter electrode current collector 105 and the counter electrode 106, thereby preventing the mixed gas from contacting the counter electrode 106. Therefore, the carbon dioxide recovery system 1 involved in the fifth embodiment can suppress oxidation of the electroactive auxiliary material and the binder of the counter electrode 106, and suppress the reduction of the recovery capacity of the recovery target gas in the carbon dioxide recovery system 1.

[0149] The following points can be cited as the material or characteristics required for the resin 116 used for molding. First, in order to simultaneously seal the working electrode 104 and the counter electrode 106, the resin 116 can be listed as having electrical insulation. In addition, in order to achieve molding, the resin 116 can be listed as having fluidity and curability.

[0150] Furthermore, in order to prevent the mixed gas from contacting the counter electrode 106, the resin 116 may be gas impermeable (i.e., gas barrier). In addition, in order to maintain the electrochemical cell 101 inside the molded resin 116, the resin 116 may have a certain mechanical strength. An example of the resin 116 that meets these conditions is an epoxy resin mixed with a silica filler.

[0151] As described above, according to the carbon dioxide recovery system 1 of the fifth embodiment, even when the molded resin 116 is used as the counter electrode surrounding member 110 , the same operational effects as those of the above-described embodiments can be obtained by the structure and operation.

[0152] The present disclosure is not limited to the above-described embodiment, and various modifications as described below are possible without departing from the gist of the present disclosure.

[0153] In the above-mentioned embodiment, an example of applying the gas recovery system involved in the present disclosure to a carbon dioxide recovery system 1 for recovering carbon dioxide from a mixed gas is described, but the application of the gas recovery system involved in the present disclosure is not limited to this. The gas recovery system involved in the present disclosure can also be applied to a system for recovering a specific type of gas other than carbon dioxide from a mixed gas. For example, nitrogen oxide gas (NOx) and sulfur oxide gas (SOx) can also be used as the recovery target gas in the gas recovery system.

[0154] In the third embodiment, the opening 112a of the working electrode side film 112 is a single opening having the same size as the working electrode 104, but the present invention is not limited to this. The opening 112a may be a plurality of openings as long as the working electrode 104 is exposed to the mixed gas.

[0155] When a plurality of openings are arranged in the same range as the working electrode 104, a frame portion constituting the opening edges of the plurality of openings is arranged in the same range as the working electrode 104. The frame portion can exert pressure in a direction that presses the constituent materials of the electrochemical cell 101 in the stacking direction within the range of the working electrode 104. That is, the opening portion 112a of the working electrode side film 112 is constituted by a plurality of openings, so that the adhesion of the constituent materials in the electrochemical cell 101 can be improved.

[0156] The present disclosure is described based on the embodiments, but it should be understood that the present disclosure is not limited to the embodiments and structures. The present disclosure also includes various modifications and modifications within the equivalent range. Among them, various combinations and methods, further including only one element, more than one, or less than one other combinations and methods are also included in the scope and scope of thought of the present disclosure.

Claims

1. A gas recovery system for recovering a target gas from a mixed gas by an electrochemical reaction, wherein: The gas recovery system comprises: An electrochemical cell (101) is composed of a working electrode (104) that adsorbs the gas to be recovered, a counter electrode (106) that transmits and receives electrons to and from the working electrode, an insulator (107) that is arranged between the working electrode and the counter electrode to prevent physical contact between the working electrode and the counter electrode and suppress electrical short circuit, a working electrode collector material (103) that abuts against the working electrode to electrically connect the working electrode and the counter electrode, and a counter electrode collector material (105) that abuts against the counter electrode to electrically connect the working electrode and the counter electrode. The counter electrode surrounding member (110) is configured to cover the counter electrode and the counter electrode current collecting material for the electrochemical cell and inhibit contact between the mixed gas and the counter electrode.

2. The gas recovery system according to claim 1, wherein: The counter electrode surrounding member (110) is composed of membrane members (111, 112, 113), and the membrane members (111, 112, 113) are formed of a material that is impermeable to the mixed gas. The film member is arranged to cover the counter electrode and the counter electrode current collecting material and is bonded to the counter electrode in a state of including at least the outer edge of the separator.

3. The gas recovery system according to claim 1, wherein: The counter electrode surrounding member (110) includes a housing container (115) formed of a material impermeable to the mixed gas and housing the electrochemical cell, and is configured to prevent the mixed gas from flowing into the interior of the housing container.

4. The gas recovery system according to claim 3, wherein: The space between the inner surface of the storage container and the counter electrode current collecting material and the counter electrode of the electrochemical cell is filled with a resin (116) that is impermeable to the mixed gas, and the filled resin prohibits the mixed gas from contacting the counter electrode current collecting material and the counter electrode.

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