Flowing electrolytic tank for efficient photo-assisted electrochemical reaction

Abstract

The utility model belongs to the technical field of flowing electrolytic tank devices, and relates to a flowing electrolytic tank for efficient photo-assisted electrochemical reaction, which comprises a flowing electrolytic tank and a photo-assisted component, the flowing electrolytic tank comprises an anode tank and a cathode tank, the cathode tank comprises a cathode liquid chamber and a cathode gas chamber, and the photo-assisted component is arranged in the cathode liquid chamber. The cathode catalyst layer is hermetically clamped between the anode tank and the cathode tank; the anode tank comprises an anolyte chamber and an ion exchange membrane; the ion exchange membrane is arranged between the catholyte chamber and the anolyte chamber and is perpendicular to the cathode catalyst layer; the photo-assisted assembly comprises a liquid chamber sealing cover and a quartz glass sheet, and the quartz glass sheet is installed on the cathode liquid chamber in a sealed mode through the liquid chamber sealing cover. Compared with the prior art, according to the utility model, reconstruction design is carried out aiming at a traditional flowing electrolytic tank, a light field is introduced in an electro-catalytic reaction, and the product selectivity is further improved, so that the working voltage of the whole battery is lower, and the energy utilization efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to flow electrolytic cell device technical field relates to a kind of for the flow electrolytic cell of high-efficiency light-assisted electrochemical reaction. BACKGROUND

[0002] In the electrochemical reaction based on renewable power driving, the target product needs to be generated with high selectivity and stability, and the current method is to use a flow electrolytic cell to improve the diffusion of reactants and eliminate the influence of electrolyte structure, thereby increasing the production rate by 1-2 orders of magnitude, but the selectivity is still limited, and the selectivity of single product is difficult to further optimize. Therefore, a device is needed that can be based on the structure of a flow electrolytic cell to improve the selectivity of products through an external light field.

[0003] Chinese patent CN217149332U provides a reactor suitable for various electrochemical reactions, which has three chambers: a gas chamber, a cathode chamber and an anode chamber. The reactor can flow the gas to be converted through the gas chamber, and flow the electrolyte through the cathode chamber and the anode chamber, so as to convert the gas to be converted into reaction products with high added value through electrochemical reaction. The reactor of the patent can be used to continuously produce target products, but due to the limited selectivity of product generation under pure electricity, multiple fields are needed to further improve the selectivity of single product. SUMMARY

[0004] The utility model aims at overcoming the defects of the prior art and provides a flow electrolytic cell for high-efficiency light-assisted electrochemical reaction. The utility model introduces a light field in the electrocatalytic reaction, improves the selectivity of electrocatalytic reaction products through external illumination, and can monitor the reaction temperature in real time through a thermocouple during the reaction. The utility model is suitable for a reactor for various light-assisted electrochemical reactions.

[0005] The purpose of the utility model can be achieved by the following technical solutions:

[0006] The utility model provides a flow electrolytic cell for high-efficiency light-assisted electrochemical reaction, which comprises a flow electrolytic cell and a light-assisted assembly. The flow electrolytic cell comprises an anode cell and a cathode cell. The cathode cell comprises a cathode liquid chamber and a cathode gas chamber, and a cathode catalyst layer is sealingly arranged between the two. The anode cell comprises an anode liquid chamber and an ion exchange membrane. The ion exchange membrane is arranged between the cathode liquid chamber and the anode liquid chamber and is perpendicular to the cathode catalyst layer.

[0007] The light-assisted assembly comprises a liquid chamber sealing cover and a quartz glass sheet. The quartz glass sheet is sealingly installed on the cathode liquid chamber through the liquid chamber sealing cover.

[0008] Further, the light-assisted assembly further comprises a light source. Light passes through the quartz glass sheet, irradiates the cathode catalyst layer, and assists the electrochemical reaction.

[0009] Further, the two sides of the cathode catalyst layer are respectively provided with a first cathode sealing ring and a second cathode sealing ring, and the sealing ring can be made of silica gel or polytetrafluoroethylene.

[0010] Further, the first cathode sealing ring and the second cathode sealing ring are respectively provided with a through hole at the same position, and light passes through the through hole of the first cathode sealing ring to irradiate the cathode catalyst layer, thereby assisting the electrochemical reaction.

[0011] Further, the cathode liquid chamber is provided with a cathode electrolyte inlet and a cathode electrolyte outlet, and a channel for the flow of the cathode electrolyte and the liquid product.

[0012] Further, the cathode liquid chamber is further provided with a temperature measuring thermocouple and a reference electrode.

[0013] Further, the cathode gas chamber is provided with a reaction gas inlet and a reaction gas outlet, and a channel for the flow of the reaction gas, and the reaction gas enters the side of the cathode catalyst layer through the channel to perform the electrochemical reaction under the light assistance.

[0014] Further, the two sides of the ion exchange membrane are respectively provided with a first anode sealing ring and a second anode sealing ring, and the sealing ring can be made of silica gel or polytetrafluoroethylene.

[0015] Further, the ion exchange membrane is provided with an anode catalyst layer on one side.

[0016] Further, the anode liquid chamber is further provided with an anode electrolyte inlet and an anode electrolyte outlet, and a channel for the flow of the anode electrolyte.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] (1) The utility model provides a flow electrolytic cell for high -efficient light assisted electrochemical reaction, including flow electrolytic cell and light assisted assembly, the flow electrolytic cell includes anode pool and cathode pool, cathode pool includes cathode liquid chamber and cathode gas chamber, and the cathode catalyst layer of sealing clamping between both, anode pool includes anode liquid chamber and ion exchange membrane, ion exchange membrane sets up between cathode liquid chamber and anode liquid chamber, and with cathode catalyst layer each other vertical, the light assisted assembly includes liquid chamber sealing cover and quartz glass sheet, and the quartz glass sheet is sealed installation on cathode liquid chamber through liquid chamber sealing cover, wherein, cathode gas chamber has with the gas pipeline and the gas pipeline of export of outside communication, for the gas that flows to be converted and gas product, cathode liquid chamber has with the cathode liquid pipeline of export of outside communication, for flowing cathode electrolyte and liquid product, anode liquid chamber has with the anode liquid pipeline of export of outside communication, for flowing anode electrolyte, through the flow electrolytic cell structure design above, in the electrocatalytic reaction through the design quartz glass sheet introduction light field, auxiliary electrochemical reaction.

[0019] (2) The utility model discloses a cathode liquid chamber is equipped with temperature measurement thermocouple, in situ monitoring catalyst layer upper portion temperature, be applicable to a variety of light field auxiliary electrochemical reaction's reaction device.

[0020] (3) The utility model discloses a cathode liquid chamber still is equipped with reference electrode, and the distance between reference electrode and working electrode is shortened, reduces solution resistance, and energy utilization efficiency is improved.

[0021] (4) The utility model reconstructs design to traditional flow electrolytic cell, introduces light field in the electrocatalytic reaction, further improves product selectivity, makes full cell working voltage lower, and energy utilization efficiency is improved. DRAWINGS

[0022] Figure 1 It is the structural schematic diagram of the utility model flow electrolytic cell;

[0023] Figure 2 It is the structural exploded view of the utility model flow electrolytic cell.

[0024] Mark explanation in drawing:

[0025] 1-cathode liquid chamber, 2-anode liquid chamber, 3-liquid chamber sealing cover, 4-quartz glass sheet, 5-first cathode seal ring, 6-cathode catalyst layer, 7-second cathode seal ring, 8-cathode gas chamber, 9-first anode seal ring, 10-ion exchange membrane, 11-second anode seal ring, 12-temperature measurement thermocouple passageway, 13-reference electrode fixed hole. Specific implementation

[0026] The utility model will be described in detail below in combination with the drawings and specific embodiments. The embodiments are implemented on the premise of the technical scheme of the utility model, and detailed implementation modes and specific operation processes are given, but the protection scope of the utility model is not limited to the following embodiments.

[0027] In the description of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model. The terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0028] In the description of the utility model, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0029] In the following embodiments or examples, if there is no special description of the function parts or structures, it is indicated that they are all conventional parts or conventional structures adopted in the field to realize the corresponding functions.

[0030] The above embodiments will be described in more detail below in combination with specific embodiments.

[0031] Embodiment 1

[0032] The embodiment provides a flow electrolytic cell for efficient light-assisted electrochemical reaction, as shown in Figure 1 、 Figure 2 The flow electrolytic cell includes an anode cell and a cathode cell, the cathode cell includes a cathode liquid chamber 1 and a cathode gas chamber 8, and a cathode catalyst layer 6 is sealingly arranged between the two; the anode cell includes an anode liquid chamber 2 and an ion exchange membrane 10; the ion exchange membrane 10 is arranged between the cathode liquid chamber 1 and the anode liquid chamber 2 and is perpendicular to the cathode catalyst layer 6.

[0033] The light-assisted assembly includes a liquid chamber sealing cover 3 and a quartz glass sheet 4, and the quartz glass sheet 4 is sealingly arranged on the cathode liquid chamber 1 through the liquid chamber sealing cover 3.

[0034] In this embodiment, the light-assisted assembly further comprises a light source, and the light passes through the quartz glass sheet 4 to irradiate the cathode catalyst layer 6, thereby assisting the electrochemical reaction.

[0035] In this embodiment, the cathode catalyst layer 6 is provided with a first cathode sealing ring 5 and a second cathode sealing ring 7 on both sides, respectively, and the sealing rings are made of silica gel.

[0036] In this embodiment, the first cathode sealing ring 5 and the second cathode sealing ring 7 are both provided with through holes at the same positions, and the light passes through the through holes on the first cathode sealing ring 5 to irradiate the cathode catalyst layer 6, thereby assisting the electrochemical reaction.

[0037] In this embodiment, the cathode liquid chamber 1 is provided with a cathode electrolyte inlet and a cathode electrolyte outlet, as well as a channel for the flow of cathode electrolyte and liquid product.

[0038] In this embodiment, the cathode liquid chamber 1 is also provided with a temperature measuring thermocouple and a reference electrode. More specifically, the cathode liquid chamber 1 is provided with a temperature measuring thermocouple channel 12 and a reference electrode fixing hole 13; the temperature measuring thermocouple channel 12 is used for inserting a thermocouple for temperature measurement, and the reference electrode fixing hole 13 is used for fixing a reference electrode.

[0039] In this embodiment, the cathode gas chamber 8 is provided with a reaction gas inlet and a reaction gas outlet, as well as a channel for the flow of reaction gas, and the reaction gas enters one side of the cathode catalyst layer 6 through the channel to perform electrochemical reaction under the assistance of light.

[0040] In this embodiment, the ion exchange membrane 10 is provided with a first anode sealing ring 9 and a second anode sealing ring 11 on both sides, respectively, and the sealing rings are made of silica gel.

[0041] In this embodiment, one side of the ion exchange membrane 10 is provided with an anode catalyst layer.

[0042] In this embodiment, the anode liquid chamber 2 is also provided with an anode electrolyte inlet and an anode electrolyte outlet, as well as a channel for the flow of anode electrolyte.

[0043] The working process of the flow electrolysis cell for efficient light-assisted electrochemical reaction in this embodiment is as follows:

[0044] The specific structure of the efficient light-assisted electrochemical flow electrolysis cell is shown in Figure 1 、 Figure 2 , which comprises a flow electrolysis cell and a light-assisted assembly, the flow electrolysis cell comprises an anode pool and a cathode pool, and the light-assisted assembly comprises a liquid chamber sealing cover 3 and a quartz glass sheet 4.

[0045] The cathode tank includes a cathode liquid chamber 1 and a cathode gas chamber 8, and a cathode catalyst layer 6 is sealed between the two. The two sides of the cathode catalyst layer 6 are respectively provided with a first cathode sealing ring 5 and a second cathode sealing ring 7, which seal the cathode catalyst layer 6 between the cathode liquid chamber 1 and the cathode gas chamber 8, preventing the cathode electrolyte and liquid products from entering the cathode gas chamber 8. The cathode liquid chamber 1 is also provided with a cathode electrolyte inlet, a cathode electrolyte outlet, a channel for the flow of cathode electrolyte and liquid products, and a reference electrode.

[0046] A through hole for installing a quartz glass sheet 4 is provided at the center of the cathode liquid chamber 1, and the quartz glass sheet 4 is sealed and installed on the cathode liquid chamber 1 by a liquid chamber sealing cover 3. The light-assisted assembly also includes a light source. The upper part of the cathode catalyst layer 6 is sealed by a quartz glass assembly (quartz glass sheet 4 and liquid chamber sealing cover 3), which ensures good light transmission and sealing: light passes through the quartz glass sheet 4, irradiates the cathode catalyst layer 6, and assists the electrochemical reaction. More specifically, the same position of the first cathode sealing ring 5 and the second cathode sealing ring 7 on both sides of the cathode catalyst layer 6 is provided with a through hole to ensure that visible light can penetrate. After the light passes through the through hole on the quartz glass sheet 4 and the first cathode sealing ring 5, it irradiates the cathode catalyst layer 6 and assists the electrochemical reaction. The light source is a single-wavelength LED light source, which is used to irradiate visible light during the electrocatalytic reaction. The photoelectrocatalytic conditions include: constant current test, current density is 1000 mA / cm 2 , the reaction area of the cathode catalyst 14 is 0.2 cm 2 , the light power density is 3.5 W / cm 2 , and the wavelength is 532 nm.

[0047] The anode tank includes an anode liquid chamber 2 and an ion exchange membrane 10, and the ion exchange membrane 10 is provided with an anode catalyst layer on one side. The ion exchange membrane 10 is arranged between the cathode liquid chamber 1 and the anode liquid chamber 2, and is perpendicular to the cathode catalyst layer 6. The anode liquid chamber 2 is also provided with an anode electrolyte inlet and an anode electrolyte outlet, and a channel for the flow of anode electrolyte.

[0048] The flow electrolysis cell described above can be used in scenarios where a flow electrolysis cell is used for electrocatalytic reaction. For example, carbon monoxide electrocatalytic reaction to convert into acetic acid, carbon dioxide electrocatalytic reaction to convert into ethylene, ethanol, nitrate electrocatalytic reaction to convert into ammonia, nitrogen electrocatalytic reaction to convert into ammonia, alkane electrocatalytic reaction to convert into olefin, etc.

[0049] The following describes the use of the flow electrolytic cell using the above high-efficiency light-assisted electrochemical reaction as an experimental platform to promote the directional conversion of carbon monoxide into acetic acid. The specific reaction formula is as follows:

[0050] Cathode reaction: 2CO + 3H2O + 4e － → CH3COO － + 3OH －

[0051] Anode reaction: 2OH － → O2 + 2H + + 4e －

[0052] After the light passes through the through hole on the quartz glass sheet 4 and the first cathode sealing ring 5, it irradiates the cathode catalyst layer 6 to assist the electrochemical reaction. The anode electrolyte is 1M KOH, the electrolyte enters the anode liquid chamber 2 from the anode electrolyte inlet, the anode catalyst layer is electrolyzed by the anode liquid chamber 2, the electrolyte flow rate is 10 mL / min, and the electrolyte is discharged from the anode electrolyte outlet after electrolysis; the cathode electrolyte is also 1M KOH, the electrolyte enters the cathode liquid chamber 1 from the cathode electrolyte inlet, the cathode catalyst layer 6 is electrolyzed by the cathode liquid chamber 1 and the cathode gas chamber 8, the electrolyte flow rate is 10 mL / min, and the electrolyte is discharged from the cathode electrolyte outlet after electrolysis; the cathode gas chamber 8 is connected to the carbon monoxide, i.e. CO gas enters from the reaction gas inlet in the cathode gas chamber 8, the gas flow rate is 10 mL / min, and the CO enters the side of the cathode catalyst layer 6 along the gas channel on the cathode gas chamber 8 at a pressure of 1 bar, the reaction generates acetic acid, and the reacted gas is discharged from the reaction gas outlet on the cathode gas chamber 8.

[0053] Compared with the electrocatalytic reaction without the assistance of a light source, i.e. without the light-assisted assembly, the flow electrolytic cell of the present embodiment uses a light source to promote the directional conversion of carbon monoxide into acetic acid, and under the same current density of 1000 mA / cm 2 The selectivity of acetic acid is as high as 90%, the cell voltage is reduced by 180 mV, and the acetic acid faradic efficiency is increased by 36%, which is a remarkable effect.

[0054] The above description of the embodiments is for the convenience of those of ordinary skill in the art to understand and use the utility model. Those skilled in the art can easily make various modifications to these embodiments, and apply the general principles described herein to other embodiments without creative labor. Therefore, the utility model is not limited to the above embodiments, and those skilled in the art can make improvements and modifications within the scope of the utility model without departing from the scope of the utility model.

Claims

1. A flow electrolysis cell for efficient light assisted electrochemical reactions, characterized in that, The application relates to a flow electrolytic cell and a light-assisted assembly. The flow electrolytic cell comprises an anode cell and a cathode cell. The cathode cell comprises a cathode liquid chamber (1) and a cathode gas chamber (8), and a cathode catalyst layer (6) sealed between the two chambers. The anode cell comprises an anode liquid chamber (2) and an ion exchange membrane (10); the ion exchange membrane (10) is arranged between the cathode liquid chamber (1) and the anode liquid chamber (2) and is perpendicular to the cathode catalyst layer (6). The light-assisted assembly comprises a liquid chamber sealing cover (3) and a quartz glass sheet (4); the quartz glass sheet (4) is sealed on the cathode liquid chamber (1) through the liquid chamber sealing cover (3).

2. A flow electrolysis cell for efficient light assisted electrochemical reactions according to claim 1, characterized in that, The light-assisted assembly further comprises a light source, and light passes through the quartz glass sheet (4) to irradiate the cathode catalyst layer (6) and assist the electrochemical reaction.

3. The flow electrolysis cell for efficient photo-assisted electrochemical reactions according to claim 1, characterized in that, The cathode catalyst layer (6) is provided with a first cathode sealing ring (5) and a second cathode sealing ring (7) on two sides respectively.

4. A flow electrolysis cell for efficient light assisted electrochemical reactions according to claim 3, characterized in that, The first cathode sealing ring (5) and the second cathode sealing ring (7) are provided with through holes at the same positions, and light passes through the through holes on the first cathode sealing ring (5) to irradiate the cathode catalyst layer (6) and assist the electrochemical reaction.

5. The flow electrolysis cell for efficient photo-assisted electrochemical reactions according to claim 1, characterized in that, The cathode liquid chamber (1) is provided with a cathode electrolyte inlet and a cathode electrolyte outlet and a channel for the flow of cathode electrolyte and liquid product.

6. The flow electrolysis cell for efficient photo-assisted electrochemical reactions according to claim 1, characterized in that, The cathode liquid chamber (1) is further provided with a temperature measuring thermocouple and a reference electrode.

7. The flow electrolysis cell for efficient photo-assisted electrochemical reactions according to claim 1, characterized in that, The cathode gas chamber (8) is provided with a reaction gas inlet and a reaction gas outlet and a channel for the flow of reaction gas, and the reaction gas enters one side of the cathode catalyst layer (6) through the channel and performs electrochemical reaction under the assistance of light.

8. The flow electrolysis cell for efficient photo-assisted electrochemical reactions according to claim 1, characterized in that, The ion exchange membrane (10) is provided with a first anode sealing ring (9) and a second anode sealing ring (11) on two sides respectively.

9. The flow electrolysis cell for efficient photo-assisted electrochemical reactions according to claim 1, characterized in that, The ion exchange membrane (10) is provided with an anode catalyst layer on one side.

10. The flow electrolysis cell for efficient photo-assisted electrochemical reactions according to claim 1, characterized in that, The anode liquid chamber (2) is further provided with an anode electrolyte inlet and an anode electrolyte outlet and a channel for the flow of anode electrolyte.

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