ELECTRODE CATALYST, ELECTROCHEMICAL REACTION APPARATUS, AND METHOD FOR PRODUCING ELECTRODE CATALYST
An object of the present invention is to provide: an electrode catalyst capable of achieving a significantly higher generation efficiency of a C2 compound than that of a C1 compound; an electrochemical reaction apparatus including the electrode catalyst; and a method for producing the electrode catalyst, and the present invention provides: an electrode catalyst ( 10 ) for electrochemically reducing carbon dioxide and/or carbon monoxide, the electrode catalyst ( 10 ) including a gas diffusion layer ( 11 ), a catalyst ( 12 ) present on a surface of the gas diffusion layer ( 11 ), and a coating layer ( 13 ) covering at least part of a surface of the catalyst ( 12 ), wherein the catalyst ( 12 ) contains a Cu element, and wherein the coating layer ( 13 ) contains a fluororesin; an electrochemical reaction apparatus including the electrode catalyst; and a method for producing the electrode catalyst.
1 . An electrode catalyst for electrochemically reducing carbon dioxide and/or carbon monoxide,
the electrode catalyst comprising: a gas diffusion layer; a catalyst present on a surface of the gas diffusion layer; and a coating layer covering at least part of a surface of the catalyst,
wherein the catalyst comprises a Cu element, and
wherein the coating layer comprises a fluororesin.
2 . The electrode catalyst according to claim 1 , wherein the catalyst is in the form of a catalyst layer.
3 . The electrode catalyst according to claim 2 , wherein a thickness of the catalyst layer falls within ±10% of an average thickness of the catalyst layer.
4 . The electrode catalyst according to claim 3 , wherein the average thickness of the catalyst layer is 5 nm or more and 1000 nm or less.
5 . The electrode catalyst according to claim 1 , wherein a mass percentage of a fluorine element in the coating layer based on a mass of the electrode catalyst is 0.2% by mass or more and 15.0% by mass or less.
6 . The electrode catalyst according to claim 1 , wherein the catalyst is metal Cu.
7 . The electrode catalyst according to claim 1 , wherein the fluororesin comprises polytetrafluoroethylene.
8 . An electrochemical reaction apparatus for electrochemically reducing carbon dioxide and/or carbon monoxide,
the apparatus comprising: a cathode; an anode; an anion exchange membrane provided between the cathode and the anode; a liquid flow path which is provided between the cathode and the anion exchange membrane and through which a cathode side electrolytic solution flows; and a liquid flow path which is provided between the anode and the anion exchange membrane and through which an anode side electrolytic solution flows,
wherein the cathode comprises the electrode catalyst according to claim 1 .
9 . A method for producing an electrode catalyst for electrochemically reducing carbon dioxide and/or carbon monoxide,
the method comprising the following steps of:
(a) forming a catalyst layer comprising a Cu element, on a surface of a gas diffusion layer; and
(b) forming a coating layer comprising a fluororesin, on at least part of a surface of the catalyst layer.
10 . The method according to claim 9 , wherein, in step (b), the coating layer is formed by spray-coating at least part of the surface of the catalyst layer with a fluororesin-containing solution or dispersion liquid.