Conductive plate, preparation method and application thereof, three-dimensional structure and application thereof

Abstract

The present invention belongs to the technical field of sewage treatment, and specifically relates to a conductive plate, a preparation method and application thereof, a three-dimensional structure and application thereof. The present invention provides a conductive plate, comprising a modified vinyl ester resin substrate and a conductive coating arranged on the surface of the modified vinyl ester resin substrate; the modified vinyl ester resin substrate comprises a vinyl ester resin and nanofibers filled in the vinyl ester resin. The conductive plate provided by the present invention has excellent mechanical properties, can meet the application requirements of various environmental scenarios and has no structural damage; at the same time, the conductive plate obtained by the present invention has good electrical conductivity, and as the anode of a microbial electrochemical system, it can further improve the output performance of the system and has a higher output power density.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and in particular relates to a conductive plate and a preparation method and application thereof, a three-dimensional structure and application thereof. Background Art

[0002] Microbial electrochemical systems are currently widely used in wastewater treatment. They can convert chemical energy stored in organic matter into electrical energy through the catalytic action of microorganisms. However, several major obstacles remain in the practical application of microbial electrochemical systems, such as the high cost of electrode materials, complex material modification processes, poor mechanical strength of electrode materials, poor enrichment of functional microorganisms, and low system output power. These obstacles significantly limit the development and practical application of microbial electrochemical systems.

[0003] The main components of a microbial electrochemical system include an anode, a cathode, and an ion exchange membrane. The anode's primary function is to serve as a carrier for the growth of electroactive microorganisms, receiving extracellular electrons generated by the oxidation and metabolism of organic matter by microorganisms and providing them to the cathode to complete the entire reaction process and output electrical energy. Therefore, it is a key factor affecting the performance of microbial electrochemical systems. To date, traditional carbon-based materials such as carbon cloth, carbon paper, and carbon felt have been commonly used as anode materials for microbial electrochemical systems. However, these materials still suffer from poor mechanical strength, poor enrichment of functional microorganisms, and low output power density. Summary of the Invention

[0004] The purpose of the present invention is to provide a conductive plate and its preparation method and application, a three-dimensional structure and its application. The conductive plate provided by the present invention has high mechanical strength, can effectively enrich functional microorganisms and has a high output power density.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention provides a conductive plate, comprising a modified vinyl ester resin substrate and a conductive coating disposed on the surface of the modified vinyl ester resin substrate;

[0007] The modified vinyl ester resin substrate includes a vinyl ester resin and nanofibers filled in the vinyl ester resin.

[0008] Preferably, the thickness of the conductive coating is 10 to 200 μm;

[0009] The thickness of the conductive plate is 0.5-3.0 mm.

[0010] Preferably, the nanofibers include polyester nanofibers and / or polyamide nanofibers;

[0011] The mass ratio of the vinyl ester resin to the nanofiber is 1 to 10:1.

[0012] Preferably, the modified vinyl ester resin further comprises a conductive filler;

[0013] The conductive filler includes one or more of carbon nanotubes, graphene, biochar and conductive activated carbon;

[0014] The mass of the conductive filler is 0 to 50% of the total mass of the vinyl ester resin and the nanofiber, and is not 0.

[0015] The present invention also provides a method for preparing the conductive plate described in the above technical solution, comprising the following steps:

[0016] The vinyl ester resin and the nanofiber material are mixed and melt-extruded to obtain a modified vinyl ester resin substrate;

[0017] Conductive coating is coated on the surface of the vinyl ester resin substrate to obtain the conductive plate.

[0018] Preferably, the mixed raw materials further include conductive fillers.

[0019] Preferably, the temperature of the melt extrusion is 180-250°C.

[0020] The present invention also provides a three-dimensional structure, comprising several three-dimensional structural units, each of which is composed of n conductive plates connected together, where the value of n ranges from 3 to 8; the conductive plates are the conductive plates described in the above technical solution or the conductive plates prepared by the preparation method described in the above technical solution.

[0021] Preferably, the side length of the conductive plate is 1 cm to 80 cm; the height is 1 cm to 30 cm.

[0022] The present invention also provides the use of the conductive plate described in the above technical solution, the conductive plate prepared by the preparation method described in the above technical solution, or the three-dimensional structure described in the above technical solution as an anode of a microbial electrochemical system.

[0023] The present invention provides a conductive plate comprising a modified vinyl ester resin substrate and a conductive coating disposed on the surface of the modified vinyl ester resin substrate; the modified vinyl ester resin substrate comprises a vinyl ester resin and nanofibers filled within the vinyl ester resin. The conductive plate provided by the present invention has excellent mechanical properties, suitable for various environmental applications without structural damage. Furthermore, the conductive plate obtained by the present invention has good electrical conductivity and a rough surface that facilitates the accumulation of electrogenic bacteria. As the anode of a microbial electrochemical system, it can further enhance the system's output performance and achieve a high output power density. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1Schematic diagram of the microbial electrochemical system used in Examples 1 and 2 of the present invention, wherein 1-anode, 2-cathode, 3-cation exchange membrane, 4-external resistor, 5-external circuit;

[0025] Figure 2 This is a schematic structural diagram of the three-dimensional structure provided in Example 3 (n=4);

[0026] Figure 3 is a tensile curve diagram of the modified vinyl ester resin substrate obtained in Example 1;

[0027] Figure 4 This is a SEM image of the conductive plate obtained in Example 1;

[0028] Figure 5 This is the SEM image of the conductive plate after operation in Application Example 1;

[0029] Figure 6 This is the output voltage curve of the microbial electrochemical system in Application Example 1;

[0030] Figure 7 This is the output power density curve of the microbial electrochemical system in Application Example 1;

[0031] Figure 8 This is the SEM image of the conductive plate obtained in Example 2;

[0032] Figure 9 This is the SEM image of the conductive plate after operation in Application Example 2;

[0033] Figure 10 is the output voltage curve of the microbial electrochemical system in Application Example 2;

[0034] Figure 11 This is the output power density curve of the microbial electrochemical system in Application Example 2;

[0035] Figure 12 Schematic diagram of the microbial electrochemical system used in Example 3 of the present invention, wherein 1-anode, 2-cathode, 3-external resistor, 4-external circuit;

[0036] Figure 13 is the output voltage curve of the microbial electrochemical system in Application Example 3;

[0037] Figure 14 This is the output power density curve of the microbial electrochemical system in Application Example 3;

[0038] Figure 15 is the output voltage curve of the microbial electrochemical system in Application Example 4;

[0039] Figure 16This is the output power density curve of the microbial electrochemical system in Application Example 4. DETAILED DESCRIPTION

[0040] The present invention provides a conductive plate, comprising a modified vinyl ester resin substrate and a conductive coating disposed on the surface of the modified vinyl ester resin substrate;

[0041] The modified vinyl ester resin substrate includes a vinyl ester resin and nanofibers filled in the vinyl ester resin.

[0042] In the present invention, the vinyl ester resin preferably includes polyethylene resin and / or polypropylene resin. In the present invention, the nanofiber preferably includes polyester nanofiber and / or polyamide nanofiber.

[0043] In the present invention, the mass ratio of the vinyl ester resin to the nanofibers is preferably 1 to 10:1, more preferably 3 to 8:1, and even more preferably 5 to 6:1.

[0044] In the present invention, the modified vinyl ester resin substrate preferably further comprises a conductive filler; the conductive filler preferably comprises one or more of carbon nanotubes, graphene, biochar and conductive activated carbon.

[0045] In the present invention, the mass of the conductive filler is preferably 0 to 50% of the total mass of the vinyl ester resin and the nanofibers, and is not 0, more preferably 10 to 40%, and even more preferably 20 to 30%.

[0046] In the present invention, the conductive material in the conductive coating preferably includes one or more of carbon nanotubes, graphene, activated carbon, biochar, conductive polymers, copper, silver and nickel.

[0047] In the present invention, the thickness of the conductive coating is preferably 10-200 μm, more preferably 50-150 μm, and more preferably 100-120 μm. In the present invention, the thickness of the conductive plate is preferably 0.5-3.0 mm, more preferably 1.0-2.5 mm, and more preferably 1.5-2.0 mm.

[0048] The present invention also provides a method for preparing the conductive plate described in the above technical solution, comprising the following steps:

[0049] The vinyl ester resin and the nanofibers are mixed and melt-extruded to obtain a modified vinyl ester resin substrate;

[0050] Conductive coating is coated on the surface of the vinyl ester resin substrate to obtain the conductive plate.

[0051] In the present invention, unless otherwise specified, all raw materials are commercially available products well known to those skilled in the art.

[0052] The present invention mixes vinyl ester resin and nanofibers, and obtains a modified vinyl ester resin substrate by melt extrusion.

[0053] In the present invention, the mixed raw materials preferably further include a conductive filler; the type of the conductive filler is consistent with the type of the conductive filler defined in the above technical solution, and will not be described in detail here.

[0054] The present invention has no particular limitation on the mixing process, and any method known to those skilled in the art may be used.

[0055] In the present invention, the temperature of the melt extrusion is preferably 180 to 250° C., more preferably 190 to 240° C., and even more preferably 200 to 230° C. In the present invention, the melt extrusion is preferably performed in a twin-screw extruder.

[0056] After obtaining the modified vinyl ester resin substrate, the present invention coats a conductive coating on the surface of the vinyl ester resin substrate to obtain the conductive plate.

[0057] In the present invention, the resistivity of the conductive coating is preferably 0.1 to 5 mΩ·cm. In the present invention, the conductive coating preferably includes one or more of carbon nanotube conductive coating, graphene conductive coating, activated carbon conductive coating, biochar conductive coating, conductive polymer coating, conductive copper paste, conductive silver paste and conductive nickel paste. In the present invention, the carbon nanotube conductive coating is preferably the carbon nanotube conductive coating with model No. XFEC01 produced by Jiangsu Xianfeng Nano Technology Co., Ltd., and the resistivity of the carbon nanotube conductive coating is preferably 0.1 to 0.2 Ω·cm; the graphene conductive coating is preferably the graphene conductive coating with model No. TF-18031 produced by Suzhou Tanfeng Graphene Technology Co., Ltd., and the resistivity of the graphene conductive coating is preferably 2 to 3 Ω·cm.

[0058] Prior to coating, the present invention preferably further comprises diluting the conductive coating. The present invention does not specifically limit the dilution process; the conductive coating can be simply mixed with water. In a specific embodiment of the present invention, the dilution process preferably involves diluting 20 mL of the conductive coating with water to 50 mL.

[0059] The present invention does not particularly limit the coating method, and any method known to those skilled in the art can be used. In the present invention, the coating is preferably performed on both sides of the modified vinyl ester resin substrate. In a specific embodiment of the present invention, the coating preferably includes spraying, brushing, or dipping.

[0060] After the coating, the present invention preferably further comprises drying the obtained wet film; the drying conditions are preferably: drying at 60° C. for 2 hours.

[0061] The present invention also provides a three-dimensional structure, comprising several three-dimensional structural units, each of which is composed of n conductive plates connected together, where the value of n ranges from 3 to 8; the conductive plates are the conductive plates described in the above technical solution or the conductive plates prepared by the preparation method described in the above technical solution.

[0062] In the present invention, the value range of n is 3 to 8, more preferably 4 to 6. In the present invention, the side length of the conductive plate is preferably 1 cm to 80 cm; the height is preferably 1 cm to 30 cm.

[0063] In the present invention, the method for preparing the three-dimensional structure preferably includes: welding the conductive plate using a plastic welding machine; or after obtaining the modified vinyl resin substrate, welding the modified vinyl resin substrate using a plastic welding machine, and finally coating the conductive coating.

[0064] The present invention has no special limitation on the welding process, and any method known to those skilled in the art may be used.

[0065] The present invention also provides the use of the conductive plate described in the above technical solution, the conductive plate prepared by the preparation method described in the above technical solution, or the three-dimensional structure described in the above technical solution as an anode of a microbial electrochemical system.

[0066] In the present invention, the conductive plate can be directly used as the anode of the microbial electrochemical system, or the conductive plate can be prepared into a three-dimensional structure and applied as an electrode to the microbial electrochemical system.

[0067] In the present invention, the three-dimensional structure has more excellent structural advantages in practical applications compared to a single conductive plate. For example, when used in the sediment of polluted water bodies, by setting specific three-dimensional structure units and placing the three-dimensional structure electrodes in the sediment, the three-dimensional structure not only has better structural stability but also can fix the sediment and prevent soil erosion or water turbidity caused by sediment disturbance, which is more conducive to practical applications.

[0068] In order to further illustrate the present invention, a conductive plate provided by the present invention, its preparation method and application, three-dimensional structure and application are described in detail below in combination with the drawings and embodiments, but they should not be understood as limiting the scope of protection of the present invention.

[0069] Example 1

[0070] The polyamide nanofibers and polyethylene resin were mixed in a mass ratio of 1:1, 50% by mass of carbon nanotubes were added to the resulting mixture, and then the mixture was melt-blended and extruded in a twin-screw extruder at a temperature of 200° C. to obtain a modified vinyl ester resin substrate;

[0071] 20 mL of carbon nanotube conductive coating (purchased from Jiangsu Xianfeng Nanomaterial Technology Co., Ltd., model No. XFEC01, resistivity of 0.1-0.2 Ω·cm) was diluted to 50 mL with deionized water and added to a spray gun container. The coating was evenly sprayed on both sides of the modified vinyl ester resin substrate using an electric spray gun. The spraying was repeated 3 times, and then dried at 60° C. for 2 h to obtain a conductive plate (wherein the thickness of the conductive plate was 1 mm and the thickness of the conductive coating was 10 μm);

[0072] The obtained conductive plate was cut into squares with a size of 1 cm*1 cm as electrodes.

[0073] Example 2

[0074] The polyamide nanofibers and polyethylene resin were mixed in a mass ratio of 1:1, 50% by mass of carbon nanotubes were added to the resulting mixture, and then the mixture was melt-blended and extruded in a twin-screw extruder at a temperature of 200° C. to obtain a modified vinyl ester resin substrate;

[0075] 20 mL of graphene conductive coating (purchased from Suzhou Carbon Graphene Technology Co., Ltd., model No. TF-18031, with a resistivity of 2-3 Ω·cm) was diluted to 50 mL with deionized water and added to an electric spray gun container. The coating was evenly sprayed on both sides of the modified vinyl ester resin substrate using an electric spray gun. The spraying was repeated 3 times and then dried at 60° C. for 2 h to obtain a conductive plate (wherein the thickness of the conductive plate was 1 mm and the thickness of the conductive coating was 10 μm);

[0076] The obtained conductive plate was cut into squares with a size of 1 cm*1 cm as electrodes.

[0077] Example 3

[0078] The polyamide nanofibers and polyethylene resin were mixed in a mass ratio of 1:1, 50% by mass of carbon nanotubes were added to the resulting mixture, and then the mixture was melt-blended and extruded in a twin-screw extruder at a temperature of 200° C. to obtain a modified vinyl ester resin substrate;

[0079] The obtained modified vinyl ester resin substrate was cut into plates with a size of 40 cm*15 cm, and 25 plates were welded using a plastic welding machine to obtain a modified vinyl ester resin substrate with a three-dimensional structure;

[0080] 20 mL of graphene conductive coating (purchased from Suzhou Carbon Graphene Technology Co., Ltd., model No. TF-18031, resistivity of 2-3 Ω·cm) was diluted to 50 mL with deionized water and added to the container tank of the electric spray gun. The coating was evenly sprayed on both sides of the modified vinyl ester resin substrate with a three-dimensional structure using an electric spray gun. The spraying was repeated 3 times and then dried at 60°C for 2 h to obtain a three-dimensional structure (wherein the thickness of the conductive plate was 1 mm and the thickness of the conductive coating was 10 μm).

[0081] The schematic structural diagram of the three-dimensional structure provided in this embodiment is as follows Figure 2 As shown (n=4).

[0082] Example 4

[0083] The polyamide nanofibers and polyethylene resin were mixed in a mass ratio of 1:1, and then placed in a twin-screw extruder and melt-blended and extruded at a temperature of 200° C. to obtain a modified vinyl ester resin substrate;

[0084] 20 mL of graphene conductive coating (purchased from Suzhou Carbon Graphene Technology Co., Ltd., model No. TF-18031, with a resistivity of 2-3 Ω·cm) was diluted to 50 mL with deionized water and added to an electric spray gun container. The coating was evenly sprayed on both sides of the modified vinyl ester resin substrate using an electric spray gun. The spraying was repeated 3 times and then dried at 60° C. for 2 h to obtain a conductive plate (wherein the thickness of the conductive plate was 1 mm and the thickness of the conductive coating was 10 μm);

[0085] The obtained conductive plate was cut into squares with a size of 1 cm*1 cm as electrodes.

[0086] Application Example 1

[0087] A microbial electrochemical system was constructed using the electrode obtained in Example 1 as the anode;

[0088] Two cubic organic glass chambers were used as the anode and cathode chambers of the system. The dimensions of a single cubic organic glass chamber were: length = 7 cm; width = 3 cm; height = 7 cm; the effective volume was 28 mL. The two chambers were separated by a cation exchange membrane.

[0089] The electrode obtained in Example 1 was used as the anode material of the system, and a carbon fiber brush was used as the cathode material of the system (the brush had a diameter of 2 cm and a length of 3 cm);

[0090] A 1000Ω external resistor was used to connect the anode and cathode;

[0091] The anolyte in the anode chamber is a phosphate buffer solution containing 1 g / L of sodium acetate (the phosphate buffer solution contains 0.31 g / L of NH4Cl, 0.13 g / L of KCl, 3.36 g / L of NaH2PO4·2H2O, 13.32 g / L of Na2HPO4·12H2O, 1 mL / L of trace elements, and 1 mL / L of vitamins);

[0092] The catholyte in the cathode compartment consisted of 50 mM KCl and 50 mM potassium ferrocyanide;

[0093] The system output voltage is collected in real time by a data acquisition device. When the system output voltage is lower than 50mV, the system cathode liquid and anode liquid are replaced.

[0094] Schematic diagram of the device structure of the microbial electrochemical system Figure 1 As shown, 1 is the anode, 2 is the cathode, 3 is the cation exchange membrane, 4 is the external resistor, and 5 is the external circuit.

[0095] Application Example 2

[0096] A microbial electrochemical system was constructed using the electrode obtained in Example 2 as the anode;

[0097] Two cubic organic glass chambers were used as the anode and cathode chambers of the system. The dimensions of a single cubic organic glass chamber were: length = 7 cm; width = 3 cm; height = 7 cm; the effective volume was 28 mL. The two chambers were separated by a cation exchange membrane.

[0098] The electrode obtained in Example 2 was used as the anode material of the system, and a carbon fiber brush was used as the cathode material of the system (the brush had a diameter of 2 cm and a length of 3 cm);

[0099] A 1000Ω external resistor was used to connect the anode and cathode;

[0100] The anolyte in the anode chamber is a phosphate buffer solution containing 1 g / L of sodium acetate (the phosphate buffer solution contains 0.31 g / L of NH4Cl, 0.13 g / L of KCl, 3.36 g / L of NaH2PO4·2H2O, 13.32 g / L of Na2HPO4·12H2O, 1 mL / L of trace elements, and 1 mL / L of vitamins);

[0101] The catholyte in the cathode compartment consisted of 50 mM KCl and 50 mM potassium ferrocyanide;

[0102] The system output voltage is collected in real time by a data acquisition device. When the system output voltage is lower than 50mV, the system cathode liquid and anode liquid are replaced.

[0103] Application Example 3

[0104] A microbial electrochemical system was constructed using the three-dimensional structure obtained in Example 3 as the anode;

[0105] The electrode obtained in Example 3 was used as the anode material of the system (the total area of ​​the three-dimensional structure electrode obtained by welding after unfolding is 3m 2 ), using air cathode as the system cathode material (the air cathode area is 0.6m 2 );

[0106] A 120Ω external resistor is used to connect the anode and cathode;

[0107] The anode is placed in the bottom mud and the cathode is placed on the overlying water surface, with a distance of 30 cm between the two electrodes;

[0108] Schematic diagram of the device structure of the microbial electrochemical system Figure 12 As shown, 1 is the anode, 2 is the cathode, 3 is the external resistor, and 4 is the external circuit;

[0109] The system output voltage is collected in real time through a data acquisition device.

[0110] Application Example 4

[0111] A microbial electrochemical system was constructed using the electrode obtained in Example 4 as the anode;

[0112] Two cubic organic glass chambers were used as the anode and cathode chambers of the system. The dimensions of a single cubic organic glass chamber were: length = 7 cm; width = 3 cm; height = 7 cm; the effective volume was 28 mL. The two chambers were separated by a cation exchange membrane.

[0113] The electrode obtained in Example 4 was used as the anode material of the system, and a carbon fiber brush was used as the cathode material of the system (the brush had a diameter of 2 cm and a length of 3 cm);

[0114] A 1000Ω external resistor was used to connect the anode and cathode;

[0115] The anolyte in the anode chamber is a phosphate buffer solution containing 1 g / L of sodium acetate (the phosphate buffer solution contains 0.31 g / L of NH4Cl, 0.13 g / L of KCl, 3.36 g / L of NaH2PO4·2H2O, 13.32 g / L of Na2HPO4·12H2O, 1 mL / L of trace elements, and 1 mL / L of vitamins);

[0116] The catholyte in the cathode compartment consisted of 50 mM KCl and 50 mM potassium ferrocyanide;

[0117] The system output voltage is collected in real time by a data acquisition device. When the system output voltage is lower than 50mV, the system cathode liquid and anode liquid are replaced.

[0118] Performance Testing

[0119] Test Example 1

[0120] The modified vinyl ester resin substrate obtained in Example 1 was tested for tensile strength. The test method was carried out in accordance with the test standard GB / T 1040.1-2018 for the determination of tensile properties of plastics. The tensile curve obtained was as follows: Figure 3 As shown, from Figure 3 It can be seen that the modified vinyl ester resin substrate provided by the present invention has excellent mechanical properties, the tensile strength can reach 14.96 MPa, and the material is broken before and after stretching.

[0121] Test Example 2

[0122] The conductive plate obtained in Example 1 was subjected to scanning electron microscopy testing, and the obtained SEM image is as follows: Figure 4 As shown, from Figure 4 It can be seen that the rough surface of the conductive plate is conducive to the enrichment and growth of electroactive microorganisms;

[0123] The conductive plate after the system operation in the corresponding use case 1 was tested by scanning electron microscope, and the obtained SEM image is as follows Figure 5 As shown, from Figure 5 It can be seen that after the system is run, a large number of microorganisms are enriched on the surface of the electrode.

[0124] Test Example 3

[0125] The electrochemical performance of the electrode obtained in Example 1 was tested using the microbial electrochemical system constructed in Application Example 1. The output voltage curve obtained is as follows: Figure 6 As shown, the output power density curve is as follows Figure 7 As shown;

[0126] from Figures 6-7 It can be seen that the output voltage can reach 600mV when the system is running stably, and the power density test results show that the maximum power density of the system can reach 1700mW / m 2 .

[0127] Test Example 4

[0128] The conductive plate obtained in Example 2 was subjected to scanning electron microscopy testing, and the obtained SEM image is as follows: Figure 8 As shown, from Figure 8 It can be seen that the rough surface of the conductive plate is conducive to the enrichment and growth of electroactive microorganisms;

[0129] The conductive plate in the corresponding use case 2 was tested by scanning electron microscope after the system was run, and the SEM image obtained is as follows Figure 9 As shown, from Figure 9 It can be seen that after the system is run, a large number of microorganisms are enriched on the surface of the electrode.

[0130] Test Example 5

[0131] The electrochemical performance of the electrode obtained in Example 2 was tested using the microbial electrochemical system constructed in Application Example 2. The output voltage curve obtained is as follows: Figure 10 As shown, the output power density curve is as follows Figure 11 As shown;

[0132] from Figures 10-11 It can be seen that the output voltage can reach 550mV when the system is running stably, and the power density test results show that the maximum power density of the system can reach 1084mW / m 2 .

[0133] Test Example 6

[0134] The electrochemical performance of the three-dimensional structure obtained in Example 3 was tested using the microbial electrochemical system constructed in Application Example 3. The output voltage curve obtained is as follows: Figure 13 As shown, the output power density curve is as follows Figure 14 As shown;

[0135] from Figure 13 It can be seen that the output voltage can reach 80~120mV when the system operates stably.

[0136] from Figure 14 It can be seen that the output power can reach about 23mW / m when the system is running stably. 2 .

[0137] Test Example 7

[0138] The electrochemical performance of the electrode obtained in Example 4 was tested using the microbial electrochemical system constructed in Application Example 4. The output voltage curve obtained is as follows: Figure 15 As shown, the output power density curve is as follows Figure 16 As shown;

[0139] from Figures 15-16 It can be seen that the output voltage can reach 450mV when the system is running stably, and the power density test results show that the maximum power density of the system can reach 940mW / m 2 .

[0140] Although the above embodiment provides a detailed description of the present invention, it is only a part of the embodiments of the present invention, not all of the embodiments. Other embodiments can be obtained based on this embodiment without creativity, and these embodiments all fall within the scope of protection of the present invention.

Claims

1. Application of a conductive plate as an anode in a microbial electrochemical system, characterized in that: The conductive plate comprises a modified vinyl ester resin substrate and a conductive coating disposed on the surface of the modified vinyl ester resin substrate; the thickness of the conductive plate is 1 mm, and the thickness of the conductive coating is 10 μm; the conductive material in the conductive coating is carbon nanotubes; The modified vinyl ester resin substrate comprises a vinyl ester resin and nanofibers filled in the vinyl ester resin; the vinyl ester resin is a polyethylene resin; the nanofibers are polyamide nanofibers; and the mass ratio of the polyethylene resin to the polyamide nanofibers is 1:1; The modified vinyl ester resin further comprises a conductive filler, which is a carbon nanotube; the mass of the carbon nanotube is 50% of the total mass of the vinyl ester resin and the nanofiber.

2. The use according to claim 1, characterized in that The method for preparing the conductive plate comprises the following steps: The vinyl ester resin, the conductive filler and the nanofiber are mixed and melt-extruded to obtain a modified vinyl ester resin substrate; Conductive coating is coated on the surface of the vinyl ester resin substrate to obtain the conductive plate.

3. The use according to claim 2, characterized in that The temperature of the melt extrusion is 180-250°C.

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