Atomic Indium‐Doped Copper‐Based Catalysts for Electrochemical CO2 Reduction to C2+ Products

Abstract The electrochemical carbon dioxide reduction reaction (CO 2 RR) holds substantial promise for producing high‐value chemicals and fuels, drawing significant attention from both academia and industry. This work proposes an in‐situ electrodeposition method to prepare indium‐doped copper (Cu)‐based catalysts on carbon paper (Cu 100 In x −CP, x=3.9, 4.5, 4.8, 5.1, and 7.6, denoting the molar ratio of In to Cu in the catalyst.). The catalysts Cu 100 In x −CP were used for CO 2 RR to produce multi‐carbon (C 2+ ) products. Characterization results showed that In was highly dispersed in the Cu particles at x<5.1. The Cu 100 In 5.1 −CP (containing 0.95 wt % In based on Cu) was very efficient for electrocatalytic CO 2 RR. The in‐situ Raman spectroscopy showed that Cu 100 In 5.1 −CP enhanced *CO intermediate adsorption and promoted the production of C 2+ products due to the synergistic effect between In and Cu. In doping could suppress HER, enhanced *CO intermediate adsorption, and C−C coupling for the production of C 2+ products in CO 2 RR.