CN214782177U - Experimental electrochemical reactor with gas diffusion electrode - Google Patents
Experimental electrochemical reactor with gas diffusion electrode Download PDFInfo
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- CN214782177U CN214782177U CN202023143820.6U CN202023143820U CN214782177U CN 214782177 U CN214782177 U CN 214782177U CN 202023143820 U CN202023143820 U CN 202023143820U CN 214782177 U CN214782177 U CN 214782177U
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Abstract
An experimental electrochemical reactor with a gas diffusion electrode comprises a gas cavity and two liquid cavities, wherein the two liquid cavities are divided into a working chamber cavity and an auxiliary chamber cavity, the gas cavity and the working chamber cavity are transparent cavities, and the volumes of the gas cavity and the working chamber cavity are 10-1000 mL; the upper part of the gas chamber is provided with a gas outlet nozzle and a gas inlet pipe; the gas diffusion electrode assembly is hermetically clamped between the gas chamber and the working chamber; the top of the working chamber cavity and the top of the auxiliary chamber cavity are both opened, and a reference electrode assembly and a counter electrode are sequentially placed; the reference electrode assembly comprises a reference electrode, a luggin capillary tube and/or a salt bridge; in addition, a stirring rotor is arranged at the bottom in the working chamber cavity and used for stirring the electrolyte in the working chamber cavity. The utility model has the advantages of simple structure, the dismouting is simple and convenient, can survey in real time during the experiment, control the experiment process to and stir its mass transfer process of electrolyte reinforcing.
Description
Technical Field
The utility model relates to an electrochemical reactor for experiments with gas diffusion electrode.
Background
The gas diffusion electrode is a porous membrane electrode having a special structure, and generally consists of a current collector layer, a gas diffusion layer and a catalyst layer, and allows gas to reach the inside of the electrode very easily compared to a general solid electrode. During experiment, reaction gas enters the catalyst layer through the hydrophobic porous gas diffusion layer and reacts with liquid reactant particles penetrating the catalyst layer to generate electro-catalytic reaction of a gas-liquid-electrode (catalyst) three-phase interface under the action of an external circuit potential.
The electrochemical electrode reaction process involves two liquid-phase mass transfer processes of conveying reaction particles in a liquid phase to the surface of an electrode and separating reaction product particles from the surface of the electrode, and in many cases, the liquid-phase mass transfer process can be a control step of the electrode reaction process, and the liquid-phase mass transfer process comprises three modes of electromigration, convection and diffusion. The convective mass transfer effect of the electrolyte is generally changed by adjusting the flow rate of the electrolyte, for example, the effect of enhancing forced convection is achieved by performing rapid stirring, which is often used as one of the control variable factors for changing the mass transfer effect of the liquid phase. Patent CN 105316700A discloses electrochemical reduction of CO2The reaction is carried out by an electrolytic cell. The utility model discloses an electrolytic cell comprises cathode chamber, anode chamber and vapour and liquid separator triplex, and the cathode chamber is as CO2The reduction reaction chamber is divided into an upper cavity and a lower cavity, the gas diffusion electrode is positioned between the upper cavity and the lower cavity, and CO is introduced into the upper cavity and the lower cavity2The gas reaches the interior of the gas diffusion electrode from the lower cavity, and the reference electrode and the Rough capillary are arranged at the position close to the gas diffusion electrode in the upper cavity. The electrolyte in the cathode chamber of the electrolytic cell is inconvenient to carry out stirring operation to accelerate the liquid movement rate during experimental operation, and other means are required to be considered to enhance the liquid mass transfer action process.
Characteristic features of gas diffusion electrodeThe development and utilization of new energy and new materials and the sustainable development concepts of green chemistry and chemical industry and circulation are closely attached, and the method has wide application prospect, such as electrochemical reduction of CO by using a gas diffusion electrode2Technical, electrochemical reduction of O2Preparation H2O2And electrochemical reduction of N2Synthesis of NH3And the like. Therefore, the research and development of the electrochemical reactor using the gas diffusion electrode are beneficial to deepening the understanding of the basic theoretical system of the gas diffusion electrode and are more beneficial to guiding the industrial application by using the gas diffusion electrode in the future.
Disclosure of Invention
In order to overcome the weak point that above-mentioned technique exists, the utility model provides an electrochemical reactor to laboratory research use gas diffusion electrode, its simple structure, dismouting are simple and convenient, can survey in real time during the experiment, control experiment process, and the accessible reaches the purpose of strengthening the liquid mass transfer to the rapid mixing of the interior electrolyte of studio.
The utility model relates to an experimental electrochemical reactor with a gas diffusion electrode, which is characterized by comprising a reaction chamber cavity and an electrode component,
the reactor cavity comprises a gas cavity and two liquid cavities, and the two liquid cavities are divided into a working chamber cavity and an auxiliary chamber cavity; the gas chamber, the working chamber and the auxiliary chamber are sequentially connected together through a connecting port on the side surface; the gas chamber and the working chamber are transparent chambers; the upper part of the gas chamber is provided with a gas outlet nozzle and a gas inlet pipe; the top of the working chamber cavity and the top of the auxiliary chamber cavity are both open;
the electrode assembly comprises a gas diffusion electrode and a counter electrode, and the gas diffusion electrode is hermetically clamped between a gas cavity and a connecting port of the working chamber cavity; the counter electrode is inserted into the auxiliary chamber from an opening at the top of the auxiliary chamber; the gas diffusion electrode and the counter electrode are electrically connected with a working electrode and a counter electrode wiring port of the electrochemical workstation in sequence.
The two-side chamber of the gas diffusion electrode is made of transparent materials, such as silicate glass, quartz glass, transparent Polyethylene (PE), organic glass (PMMA), transparent Polycarbonate (PC), transparent polyethylene terephthalate (PET), transparent polyvinyl chloride (PVC), transparent polypropylene (PP) and transparent Polystyrene (PS), and the preferred transparent material is one of silicate glass and quartz glass.
The center of the counter electrode, the tail end of the reference electrode and the geometric center of the gas diffusion electrode are positioned at the same horizontal height and are opposite to the surface of the gas diffusion electrode.
The tail end of a gas inlet pipe of the gas chamber extends to the position 5-20 mm away from the surface of the gas diffusion electrode.
A reference electrode assembly is inserted into an opening of the working chamber cavity, the reference electrode assembly comprises a reference electrode, a Rujin capillary tube and/or a salt bridge, the reference electrode can be directly inserted into the working chamber cavity from the opening at the top of the working chamber cavity or extend into the Rujin capillary tube or the salt bridge for use, and the reference electrode is electrically connected with a reference electrode wiring port of the electrochemical workstation; the lujin capillary tube and/or the salt bridge are/is inserted into the working chamber from the opening at the top of the working chamber, and the distance between the tail end of the lujin capillary tube and the salt bridge is 0.5-10 mm from the surface of the gas diffusion electrode.
The distance between the tail end of the Lujin capillary tube and/or the tail end of the salt bridge and the surface of the gas diffusion electrode is 1-5 mm.
The optimal size of the gas chamber and the optimal size of the two liquid chambers are determined according to an experimental scheme, and the optimal size of the gas chamber and the optimal size of the two liquid chambers are 10-1000 mL, and more preferably 50-100 mL.
Preferably, the electrochemical reactor for experiments further comprises a diaphragm which is hermetically clamped between the connecting ports of the working chamber cavity and the auxiliary chamber cavity, and the diaphragm is preferably one of an ion exchange membrane, a microporous diaphragm, an asbestos diaphragm and porous ceramic.
The surface of the gas diffusion electrode is coated with a conductive collector sheet, and the conductive collector sheet can be arranged between the gas diffusion electrode and the gas chamber or between the gas diffusion electrode and the working chamber; the conductive current collecting plate is of an annular structure with a round hole in the middle, and is made of conductive metal, conductive nonmetal or alloy sheets thereof, such as stainless steel, titanium, platinum, gold, copper, aluminum, zinc and graphite, and preferably one of titanium, platinum and gold.
The devices in the reactor are connected with each other by a sealing gasket for ensuring the sealing of the reactor, namely, two side planes of the gas diffusion electrode assembly are respectively provided with a sealing gasket, so that the gas diffusion electrode assembly is sealed and clamped between the gas chamber and the working chamber; two sides of the diaphragm are also respectively provided with a sealing gasket, so that the diaphragm is sealed and clamped between the working chamber cavity and the auxiliary chamber cavity; the sealing gasket material does not have chemical action with liquid and gas in the electrochemical reactor, has certain thickness and elastic deformation, can play a sealing role, prevents the leakage of gas and liquid, such as a silica gel sheet, a fluororubber sheet, a polytetrafluoroethylene sheet and an ethylene propylene diene monomer sheet, and is preferably made of an expanded polytetrafluoroethylene sheet.
And a stirring rotor is arranged in the bottom of the working chamber and is used for stirring the electrolyte in the working chamber so as to enhance the liquid mass transfer.
Preferably, the electrolyte passage area of the auxiliary chamber and the working chamber on two sides of the diaphragm is equal to or larger than the gas diffusion electrode passage area.
The counter electrode is made of materials, appearance and appearance, such as a solid flat plate, a net, a plurality of holes, a metal in a foam state, a nonmetal and a modified electrode thereof, according to an experimental system and a scheme, the area of the counter electrode can be large or small, the counter electrode is in a parallel and face-to-face position relation with the gas diffusion electrode, and preferably, the area of the counter electrode is larger than or equal to the effective area of the gas diffusion electrode, so that an electric field is uniformly distributed.
The utility model has the advantages that: the chambers on the two sides of the gas diffusion electrode are made of transparent materials, so that the experimental process can be observed and monitored in real time, and the real conditions of the experimental process, such as whether the gas diffusion electrode leaks liquid, whether the catalyst falls off and the like, can be fed back and mastered in time; for an experimental system with liquid phase mass transfer controlled by diffusion, a stirring rotor can be placed in the working chamber to quickly stir liquid, so that the liquid phase mass transfer process of the liquid is enhanced, and the reaction rate is accelerated; in the constructed electrochemical reactor, the gas diffusion electrode and the diaphragm are disassembled or replaced, so that the electrochemical reactor has the characteristics of simplicity and convenience in disassembly and assembly, rapidness and high efficiency, the preparation time of a gas diffusion electrode research experiment is shortened, the experiment operation difficulty of the gas diffusion electrode is reduced, and the electrochemical reactor has the application value of popularization and use.
Drawings
FIG. 1 is a schematic view of the structure (arrows indicate gas flow direction, WE indicates gas diffusion electrode; RE indicates counter electrode; CE indicates reference electrode).
The labels shown in FIG. 1 are as follows: 1-a gas chamber; 2-a working chamber; 3-an auxiliary chamber; 4-manually adjusting the chain type hoop; 5-gas leading-out nozzle; 6-gas inlet pipe; 7-a sealing gasket; 8-a conductive current collector; 9-a gas diffusion electrode; 10-lujin capillary; 11-a reference electrode; 12-sand core glass tube; 13-a stirring rotor; 14-a membrane; 15-counter electrode; 16-working chamber sealing cover; 17-a working chamber cavity air outlet pipe connector; 18-a gas inlet tube; 19-auxiliary chamber sealing cover; 20-air outlet pipe connector of auxiliary chamber cavity.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
With reference to the accompanying drawings:
example 1 an experimental electrochemical reactor with a gas diffusion electrode according to the present invention comprises a reaction chamber and an electrode assembly,
the reactor cavity comprises a gas chamber 1 and two liquid chambers, and the two liquid chambers are divided into a working chamber 2 and an auxiliary chamber 3; the gas chamber 1, the working chamber 2 and the auxiliary chamber 3 are sequentially connected together through a connecting port on the side surface; the gas chamber 1 and the working chamber 2 are transparent chambers; the upper part of the gas chamber 1 is provided with a gas outlet nozzle 5 and a gas inlet pipe 6; the top of the working chamber cavity and the top of the auxiliary chamber cavity are both open;
the electrode assembly comprises a gas diffusion electrode and a counter electrode, and the gas diffusion electrode 9 is hermetically clamped between the connecting ports of the gas chamber 1 and the working chamber 2; the counter electrode 15 is inserted into the auxiliary chamber from an opening at the top of the auxiliary chamber; the gas diffusion electrode 9 and the counter electrode 15 are electrically connected with a working electrode and a counter electrode wiring port of an electrochemical workstation in sequence.
The chambers on both sides of the gas diffusion electrode 9 are made of transparent materials, such as silicate glass, quartz glass, transparent Polyethylene (PE), organic glass (PMMA), transparent Polycarbonate (PC), transparent polyethylene terephthalate (PET), transparent polyvinyl chloride (PVC), transparent polypropylene (PP), and transparent Polystyrene (PS), and the preferred transparent material is one of silicate glass and quartz glass.
The tail end of a gas inlet pipe of the gas chamber extends to a position 5-20 mm near the gas diffusion electrode.
The optimal size of the gas chamber and the optimal size of the two liquid chambers are determined according to an experimental scheme, and the optimal size of the gas chamber and the optimal size of the two liquid chambers are 10-1000 mL, and more preferably 50-100 mL.
The conductive current collecting plate 8 is an annular structure with a circular hole in the middle, and is made of a conductive metal, a conductive nonmetal or an alloy sheet thereof, such as stainless steel, titanium, platinum, gold, copper, aluminum, zinc, graphite, preferably one of titanium, platinum and gold.
The devices in the reactor are connected with each other through sealing gaskets 7 and are used for ensuring the sealing of the reactor, namely, two sealing gaskets are respectively assembled on the planes on the two sides of the gas diffusion electrode assembly, so that the gas diffusion electrode assembly is clamped between the gas chamber and the working chamber in a sealing manner; two sides of the diaphragm are also respectively provided with a sealing gasket, so that the diaphragm is sealed and clamped between the working chamber cavity and the auxiliary chamber cavity; the sealing gasket material does not have a chemical action with liquid in the electrochemical reactor, has a certain thickness and elastic deformation, can play a sealing role, and prevents leakage of gas and liquid, such as a silica gel sheet, a fluororubber sheet, a polytetrafluoroethylene sheet and an ethylene propylene diene monomer sheet, and the preferable material is an expanded polytetrafluoroethylene sheet.
The reactor chamber may be placed horizontally and a stirring rotor 13 is placed in the bottom of the working chamber for stirring the electrolyte therein to enhance liquid mass transfer.
The counter electrode 15 is made of a material and has appearance and appearance determined according to an experimental system and scheme, such as a solid flat plate, a mesh, a plurality of holes and a metal in a foam state, a nonmetal and a modified electrode thereof, and the area of the counter electrode can be large or small and is in a parallel and face-to-face position relation with the gas diffusion electrode.
Example 2 this example differs from example 1 in that: the working chamber cavity and the diaphragm blocked at the interface is arranged between the auxiliary chamber cavities, the diaphragm 14 is one of an ion exchange membrane, a microporous diaphragm, an asbestos diaphragm and a porous ceramic layer, and the electrolyte passage areas of the auxiliary chamber cavities 3 and the working chamber cavities 2 on the two sides of the diaphragm 14 are equal to or larger than the gas diffusion electrode passage area.
The remaining components are the same as in example 1.
Example 3 this example differs from example 1 in that: a reference electrode assembly is inserted into an opening of the working chamber cavity, the reference electrode assembly comprises a reference electrode 11, a Ruggin capillary tube 10 and/or a salt bridge, the reference electrode can be directly inserted into the working chamber cavity from the opening at the top of the working chamber cavity or extend into the Ruggin capillary tube or the salt bridge for use, and the reference electrode is electrically connected with a reference electrode wiring port of the electrochemical workstation; the lujin capillary tube and/or the salt bridge are/is inserted into the working chamber from the opening at the top of the working chamber, and the distance between the tail end of the lujin capillary tube and the salt bridge is 0.5-10 mm from the surface of the gas diffusion electrode.
The distance between the tail end of the Lujin capillary tube 10 and/or the tail end of the salt bridge and the surface of the gas diffusion electrode is 1-5 mm.
The center of the counter electrode 15, the tail end of the reference electrode and the geometric center of the gas diffusion electrode are positioned at the same horizontal height and are opposite to the surface of the gas diffusion electrode.
The remaining components are the same as in example 1.
Example 4 this example differs from example 1 in that: the side surfaces of the gas chamber 1, the working chamber 2 and the auxiliary chamber 3 are provided with connectors which are all flange structures in the horizontal direction, so that the gas chamber, the working chamber and the auxiliary chamber are sequentially connected together through the corresponding flange structures. The remaining components are the same as in example 1.
Example 5 this example differs from example 4 in that: a working chamber cavity sealing cover 16 is assembled at the opening at the top of the working chamber cavity, an air outlet pipe connector 17 for leading out air and an air inlet pipe 18 for leading in air into the working chamber cavity are arranged on the working chamber cavity sealing cover 16, and the air inlet pipe 18 extends into the working chamber cavity; the top opening of the auxiliary chamber 3 is provided with an auxiliary chamber sealing cover 19, and an air outlet port 20 is arranged on the auxiliary chamber sealing cover 19. The remaining components are the same as in example 3.
Example 6 this example differs from example 4 in that: a reference electrode assembly is inserted into an opening of the working chamber cavity, the reference electrode assembly comprises a reference electrode, a Rujin capillary tube and/or a salt bridge, the reference electrode can be directly inserted into the working chamber cavity from the opening at the top of the working chamber cavity or extend into the Rujin capillary tube or the salt bridge for use, and the reference electrode is electrically connected with a reference electrode wiring port of the electrochemical workstation; the lujin capillary tube and/or the salt bridge are/is inserted into the working chamber from the opening at the top of the working chamber, and the distance between the tail end of the lujin capillary tube and the salt bridge is 0.5-10 mm from the surface of the gas diffusion electrode.
The distance between the tail end of the Lujin capillary tube and/or the tail end of the salt bridge and the surface of the gas diffusion electrode is 1-5 mm.
The counter electrode 15 is inserted into the auxiliary chamber sealing cover 19, and the center thereof is positioned at the same horizontal height with the tail end of the reference electrode 11 and the geometric center of the gas diffusion electrode 9 and is opposite to the surface of the gas diffusion electrode.
The remaining components are the same as in example 3.
Embodiment 7 the electrochemical reactor with gas diffusion electrode for experiments described in this embodiment includes a reactor cavity, an electrode assembly, and a diaphragm, where the reactor cavity is provided with a gas chamber 1 and two liquid chambers, which are both made of silicate glass, connectors of the three chambers in the horizontal direction are all in a flange structure, the size of the central aperture of the flange structure is 25mm, and the respective volume size is 50-100 mL, and the liquid chambers are divided into a working chamber 2 and an auxiliary chamber 3; the electrode assembly comprises a gas diffusion electrode assembly, a reference electrode, and a counter electrode;
the gas chamber 1 is provided with a gas outlet nozzle 5 and a gas inlet pipe 6 at the upper opening part, the tail end of the gas inlet pipe 6 extends to a position 5-20 mm near the gas diffusion electrode, during experiment, gas for reaction is conveyed to the surface of the gas diffusion electrode through the inlet pipe, and gas products which do not participate in reaction overflow the gas chamber through the outlet nozzle;
the gas diffusion electrode comprises a gas diffusion electrode and a conductive collector, wherein the conductive collector is a pure titanium foil, and the gas diffusion electrode is positioned between the gas chamber and the working chamber, is connected with the flange plates of the two chambers through an O-shaped sealing gasket 7 made of expanded polytetrafluoroethylene, and is locked by a hand-adjusted chain type hoop 4; the conductive current collecting sheet is positioned between the gas chamber 1 and the gas diffusion electrode 9, is in direct physical contact with the gas diffusion electrode for conducting, is in an annular shape with a central circular hole, and is provided with a protruding lug at the outer edge for connecting a direct current lead;
a working chamber sealing cover 16 is arranged above the opening part at the top end of the working chamber 2, so that the inside of the working chamber can be sealed and isolated from the external environment; the working chamber cavity sealing cover 16 is distributed and inserted with a Rujin capillary 10, a reference electrode 11, a sampling sealing plug, a gas inlet pipe 18 and a gas outlet pipe connector 17, wherein the tail end of the gas inlet 18 is a porous glass sand core pipe 12, the glass sand core pipe 12 is immersed in electrolyte, and N is introduced through the gas inlet pipe2Excess of N2From the aboveThe gas outlet pipe connector 17 overflows, the reference electrode 11 is arranged in the Lujin capillary tube 10, and the distance between the tail end of the Lujin capillary tube 10 and the surface of the gas diffusion electrode 9 is 1-5 mm;
a stirring rotor 13 is arranged at the bottom of the working chamber 2, and the electrolyte in the working chamber 2 can be quickly stirred under the driving of a magnetic stirrer;
an auxiliary chamber sealing cover 19 is assembled at the upper opening of the auxiliary chamber cavity 3, a solid sheet platinum counter electrode is fixedly placed at the center of the auxiliary chamber sealing cover 19, the size of a platinum sheet of the counter electrode 15 is 2 x 2cm, the center of the platinum sheet is positioned at the same horizontal height with the tail end of the reference electrode and the geometric center of the gas diffusion electrode, and the platinum sheet and the gas diffusion electrode are placed in parallel and face to face;
the diaphragm 14 is an ion exchange membrane and is positioned between the working chamber cavity 2 and the auxiliary chamber cavity 3, and the flange plate structures of the two are connected with an O-shaped sealing gasket 7 made of expanded polytetrafluoroethylene and are wrapped and locked by a hand-adjusting chain type hoop 4.
The conductive current collecting piece 8, the auxiliary electrode plunger and the reference electrode plunger are sequentially connected with a working electrode, a counter electrode and a reference electrode wiring port of an electrochemical workstation to carry out an electrochemical test experiment.
Example 8 electrochemical reduction of O in a laboratory Using a gas diffusion electrode, a schematic of the structure shown in FIG. 12Preparation H2O2Electrochemical reactor of (2), O in a steel cylinder2Enters the gas chamber 1 through the first gas inlet pipe 6, carbon paper is used as a gas diffusion electrode 9, the surface of the hydrophilic side of the carbon paper is coated with a carbon black catalyst, a conductive current collecting sheet 8 of the carbon paper is a pure titanium foil with the thickness of 0.1mm, the lug end of the titanium foil is connected with the negative electrode output end of a constant-current stabilized power supply and is in direct physical contact with the carbon paper to enable the carbon paper to conduct electricity, the working chamber 2 is screwed by a first sealing cover 16 to keep a sealing and sealing state, and 80mL of 0.05mol/L Na is placed in the working chamber 22SO4The water solution is rapidly stirred by a magnetic stirring rotor 13, and the liquid is sampled and analyzed at intervals of 30min during the experiment to determine H2O2In addition, the working chamber 2, auxiliaryThe chamber chambers 3 are separated by Nafion 117 proton exchange membrane, and 0.1mol/L H is placed in the auxiliary chamber 32SO4An aqueous solution, a 2 x 2cm platinum sheet electrode connected with the positive output end of a constant-current stabilized power supply and controlling the current density to be 80mA/cm2And after 2.5H of electrolysis, measuring the H in the working chamber by using an ultraviolet spectroscopy method for developing the color of titanium potassium oxalate2O2The concentration of (2) was 36 g/L.
Comparative example: an electrolytic cell disclosed in patent CN 105316700A is used as a comparison reactor, a gas diffusion electrode is fixedly arranged between an upper cavity and a lower cavity of a working chamber, electrolyte is poured into the upper cavity, and O is introduced into the lower cavity2The other operation and experimental control conditions were the same as in example 1. At a current density of 80mA/cm2After 2.5H of electrolysis, H in the working chamber2O2The concentration of (2) was 13.5 g/L. The electrochemical reactor provided by the utility model can accelerate the reaction rate by stirring the electrolyte, and is favorable for promoting the electroreduction of O2Preparation H2O2The reaction of (3) proceeds.
The embodiments described in this specification are merely illustrative of implementations of the inventive concepts, and the scope of the invention should not be considered limited to the specific forms set forth in the embodiments, but rather the scope of the invention includes equivalent technical means that can be conceived by those skilled in the art based on the inventive concepts.
Claims (10)
1. An experimental electrochemical reactor with a gas diffusion electrode is characterized by comprising a reaction chamber cavity and an electrode assembly,
the reactor comprises a gas chamber and two liquid chambers, wherein the two liquid chambers are divided into a working chamber and an auxiliary chamber; the gas chamber, the working chamber and the auxiliary chamber are sequentially connected together through a connecting port on the side surface; the gas chamber and the working chamber are transparent chambers; the upper part of the gas chamber is provided with a gas outlet nozzle and a gas inlet pipe; the top of the working chamber cavity and the top of the auxiliary chamber cavity are both open;
the electrode assembly comprises a gas diffusion electrode and a counter electrode, the gas diffusion electrode is clamped between a gas chamber and a connecting port of a working chamber cavity in a sealing mode, and the counter electrode is inserted into the auxiliary cavity from an opening in the top of the auxiliary cavity.
2. An experimental electrochemical reactor with a gas diffusion electrode according to claim 1, characterized in that: the tail end of a gas inlet pipe of the gas chamber extends to the position 5-20 mm away from the surface of the gas diffusion electrode.
3. An experimental electrochemical reactor with a gas diffusion electrode according to claim 1, characterized in that: a reference electrode assembly is inserted into an opening of the working chamber cavity, the reference electrode assembly comprises a reference electrode, a Rujin capillary tube and/or a salt bridge, the reference electrode is inserted into the Rujin capillary tube or the salt bridge from the opening at the top of the working chamber cavity, and the reference electrode is electrically connected with a reference electrode wiring port of the electrochemical workstation; the lujin capillary tube and/or the salt bridge are/is inserted into the working chamber from the opening at the top of the working chamber, and the distance between the tail end of the lujin capillary tube and the salt bridge is 0.5-10 mm from the surface of the gas diffusion electrode.
4. An experimental electrochemical reactor with a gas diffusion electrode according to claim 3, characterized in that: and the distance between the tail end of the Lujin capillary tube and/or the tail end of the salt bridge and the surface of the gas diffusion electrode is 1-5 mm.
5. An experimental electrochemical reactor with a gas diffusion electrode according to claim 1, characterized in that: the volume of each of the gas chamber and the two liquid chambers is 10-1000 mL.
6. An experimental electrochemical reactor with a gas diffusion electrode according to claim 1, characterized in that: the electrochemical reactor for experiments further comprises a diaphragm which is clamped between connecting ports of the working chamber cavity and the auxiliary chamber cavity in a sealing mode, and the diaphragm is one of an ion exchange membrane, a microporous diaphragm, an asbestos diaphragm and porous ceramic.
7. An experimental electrochemical reactor with a gas diffusion electrode according to claim 1, characterized in that: the surface of the gas diffusion electrode is coated with a conductive current collecting sheet; the conductive current collector is of an annular structure and is made of conductive metal, conductive nonmetal or alloy sheets thereof.
8. An experimental electrochemical reactor with a gas diffusion electrode according to claim 1, characterized in that: and all devices in the reactor cavity are connected with each other by sealing gaskets for ensuring the sealing of the reactor.
9. An experimental electrochemical reactor with a gas diffusion electrode according to claim 1, characterized in that: and a stirring rotor is arranged at the bottom in the working chamber and used for stirring the electrolyte in the working chamber so as to enhance liquid mass transfer.
10. An experimental electrochemical reactor with a gas diffusion electrode according to claim 6, characterized in that: the electrolyte passage area of the liquid chambers on the two sides of the diaphragm is equal to or larger than the passage area of the gas diffusion electrode.
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| CN202023143820.6U CN214782177U (en) | 2020-12-23 | 2020-12-23 | Experimental electrochemical reactor with gas diffusion electrode |
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| CN202023143820.6U CN214782177U (en) | 2020-12-23 | 2020-12-23 | Experimental electrochemical reactor with gas diffusion electrode |
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| CN214782177U true CN214782177U (en) | 2021-11-19 |
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