Gas phase diffusion electrode, preparation method, and application for electrocatalyzing co2 to reduce and produce co

Abstract

The preparation method of a gas phase diffusion electrode for electrocatalyzing CO 2 to reduce and produce CO provided by the present application comprises: mixing a conductive polymer monomer solution with a molar ratio of 100:1˜1:100 with a metal salt solution, and adding a dispersant to form a mixed solution; transferring the mixed solution to a substrate and reacting at a temperature of −30° C.-50° C. for 1-48 hours to obtain a gas phase diffusion electrode. By the method of using metal ions to self-initiate in-situ growth of conductive polymer monomers, the present application forms a metal-conductive polymer gas phase diffusion electrode. Due to the characteristics of the conductive polymer, the gas phase diffusion electrode can provide more nucleation sites, achieving similar catalytic effect while reducing use amount of metal.

What is claimed is: 
     
         1 . A preparation method of a gas phase diffusion electrode for electrocatalyzing CO 2  to reduce and produce CO, comprising the following steps:
 mixing a conductive polymer monomer solution with a molar ratio of 100:1˜1:100 with a metal salt solution, and adding a dispersant to form a mixed solution;   transferring the mixed solution to a substrate and reacting at a temperature of −30° C.-50° C. for 1-48 hours to obtain a metal-conductive polymer composite gas phase diffusion electrode for electrocatalyzing CO 2  to reduce and produce CO.   
     
     
         2 . The preparation method of a gas phase diffusion electrode for electrocatalyzing CO 2  to reduce and produce CO according to  claim 1 , wherein before performing the step of mixing a conductive polymer monomer solution with a metal salt solution and adding a dispersant to form a mixed solution, the method further comprises the following step: performing pre-constant temperature treatment on the conductive polymer monomer solution and the metal salt solution at 30° C. to −18° C. 
     
     
         3 . The preparation method of a gas phase diffusion electrode for electrocatalyzing CO 2  to reduce and produce CO according to  claim 1 , wherein the conductive polymer monomer solution is prepared by the following method: adding conductive polymer monomer to an acidic solution, and mixing evenly to obtain the conductive polymer monomer solution, wherein the molar ratio of the conductive polymer monomer to the acidic solution is 50:1-1:50. 
     
     
         4 . The preparation method of a gas phase diffusion electrode for electrocatalyzing CO 2  to reduce and produce CO according to  claim 3 , wherein the conductive polymer monomer is one or more of aniline, pyrrole, thiophene, indole, pyridine, carbazole, dopamine, and p-phenylacetylene monomers. 
     
     
         5 . The preparation method of a gas phase diffusion electrode for electrocatalyzing CO 2  to reduce and produce CO according to  claim 3 , wherein the solute of the acidic solution comprises one or more of hydrochloric acid, sulfuric acid, nitric acid, formic acid, acetic acid, dodecylbenzenesulfonic acid, p-toluenesulfonic acid, and camphor sulfonic acid; the solvent of the acidic solution is one or more of water, methanol, ethanol, isopropanol, acetonitrile, ethyl acetate, chloroform, dichloromethane, acetone, N-methylpyrrolidone, dimethylformamide, and dimethyl sulfoxide. 
     
     
         6 . The preparation method of a gas phase diffusion electrode for electrocatalyzing CO 2  to reduce and produce CO according to  claim 1 , wherein the metal salt comprises one or more of silver nitrate, silver hypochlorite, silver chlorate, silver perchlorate, silver fluoride, silver acetate, silver trifluoroacetate, silver trifluoromethanesulfonate, silver methanesulfonate, silver p-toluenesulfonate, chloroauric acid, zinc nitrate, zinc hypochlorite, zinc chlorate, zinc perchlorate, palladium nitrate, palladium hypochlorite, palladium chlorate, palladium perchlorate, and gallium nitrate. 
     
     
         7 . The preparation method of a gas phase diffusion electrode for electrocatalyzing CO 2  to reduce and produce CO according to  claim 1 , wherein the dispersant is one or more of isopropanol, methanol, ethanol, ethyl acetate, acetonitrile, N-methylpyrrolidone, and dimethylformamide. 
     
     
         8 . The preparation method of a gas phase diffusion electrode for electrocatalyzing CO 2  to reduce and produce CO according to  claim 1 , wherein before performing the step of transferring the mixed solution to a substrate and reacting at a temperature of −30-50° C. for 1-48 hours to obtain a metal-conductive polymer composite gas phase diffusion electrode for electrocatalyzing CO 2  to reduce and produce CO, the method further comprises the following step: performing cleaning treatment on a surface of the substrate using a hydrated organic solvent. 
     
     
         9 . The preparation method of a gas phase diffusion electrode for electrocatalyzing CO 2  to reduce and produce CO according to  claim 8 , wherein the step of performing cleaning treatment on a surface of the substrate using a hydrated organic solvent specifically comprises: coating an ionic polymer solution to the surface of the substrate, and drying in natural air; wherein a dosage of the ionic polymer is 0-1 mg/cm 2 . 
     
     
         10 . The preparation method of a gas phase diffusion electrode for electrocatalyzing CO 2  to reduce and produce CO according to  claim 1 , wherein the substrate comprises polytetrafluoroethylene film, polyvinylidene fluoride film, polytetrafluoroethylene carbon film, polyethylene film, non-woven fabric, cellulose membrane film, and modified substrate materials thereof. 
     
     
         11 . The preparation method of a gas phase diffusion electrode for electrocatalyzing CO 2  to reduce and produce CO according to  claim 1 , wherein in the step of transferring the mixed solution to a hydrophobic film substrate and reacting at a temperature of −30-50° C. for 1-48 hours to obtain a metal-conductive polymer composite gas phase diffusion electrode for electrocatalyzing CO 2  to reduce and produce CO, the transferring comprises one of droplet coating, spraying coating, scraping coating, and spin coating. 
     
     
         12 . A gas phase diffusion electrode for electrocatalyzing CO 2  to reduce and produce CO obtained by preparation by the preparation method according to  claim 1 . 
     
     
         13 . An application of a gas phase diffusion electrode for electrocatalyzing CO 2  to reduce and produce CO according to  claim 12  in electrocatalyzing and reduction reaction of CO 2 .