Electrochemical reaction device and method of manufacturing anode for electrochemical reaction device

Abstract

An anode of an electrochemical reaction device includes: a stack having a conductive substrate and an oxide layer on the conductive substrate, the conductive substrate containing nickel or iron, and the oxide layer containing a nickel oxide or an iron oxide; and an oxidation catalyst layer disposed on the stack and containing an oxidation catalyst to oxidize water. A Raman spectrum of the oxide layer measured by a Raman spectroscopic analysis has a peak at a Raman shift of 500 cm−1 or more and 600 cm−1 or less or at a Raman shift of 1270 cm−1 or more and 1370 cm−1 or less.

What is claimed is: 
     
         1 . An electrochemical reaction device, comprising:
 an electrolytic solution tank including a first room to store a first electrolytic solution containing carbon dioxide and a second room to store a second electrolytic solution containing water;   a cathode disposed inside the first room and configured to produce a carbon compound by a reduction reaction of the carbon dioxide;   an anode disposed inside the second room and configured to produce oxygen by an oxidation reaction of the water; and   a power supply connected to the cathode and the anode,   wherein the anode includes:   a stack selected from the group consisting of a first stack and a second stack, the first stack having a first conductive substrate and a first oxide layer on the first conductive substrate, the first conductive substrate containing nickel, the first oxide layer containing a nickel oxide, the second stack having a second conductive substrate and a second oxide layer on the second conductive substrate, the second conductive substrate containing iron, and the second oxide layer containing an iron oxide; and   an oxidation catalyst layer disposed on the stack and containing an oxidation catalyst to oxidize the water,   a Raman spectrum of the first oxide layer measured by a Raman spectroscopic analysis has a first peak at a Raman shift of 500 cm −1  or more and 600 cm −1  or less, or a Raman spectrum of the second oxide layer measured by the Raman spectroscopic analysis has a second peak at a Raman shift of 1270 cm −1  or more and 1370 cm −1  or less.   
     
     
         2 . The device according to  claim 1 ,
 wherein the second electrolytic solution further contains at least one selected from the group consisting of carbon dioxide, hydrogen carbonate ions, and carbonate ions.   
     
     
         3 . The device according to  claim 1 ,
 wherein a thickness of the first oxide layer or the second oxide layer is 2 μm or less.   
     
     
         4 . The device according to  claim 1 , wherein the oxidation catalyst contains a metal containing at least one element selected from the group consisting of Co, Fe, Ni, Mn, Ru, and Ir, a metal oxide, a metal hydroxide, or a metal nitride. 
     
     
         5 . The device according to  claim 1 ,
 wherein the first oxide layer is a thermal oxidization film of the first conductive substrate, and   the second oxide layer is a thermal oxidization film of the second conductive substrate.   
     
     
         6 . A method of manufacturing an anode for an electrochemical reaction device, comprising:
 heating a first conductive substrate containing nickle under an atmosphere containing oxygen to form a first oxide layer containing a nickel oxide on the first conductive substrate, or heating a second conductive substrate containing iron under an atmosphere containing oxygen to form a second oxide layer containing an iron oxide on the second conductive substrate; and   forming an oxidation catalyst layer on the first oxide layer or the second oxide layer, the oxidation catalyst layer containing an oxidation catalyst to oxidize water.   
     
     
         7 . A method of manufacturing an anode for an electrochemical reaction device, comprising:
 depositing a precursor of a nickel oxide on a first conductive substrate containing nickel, or depositing a precursor of an iron oxide on a second conductive substrate containing iron;   heating the precursor of the nickel oxide under an atmosphere containing oxygen to form a first oxide layer containing the nickel oxide, or heating the precursor of the iron oxide under an atmosphere containing oxygen to form a second oxide layer containing the iron oxide; and   forming an oxidation catalyst layer on the first or second oxide layer, the oxidation catalyst layer containing an oxidation catalyst to oxidize water.