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

The electrochemical carbon dioxide reduction reaction (CO2RR) holds substantial promise for producing high‐value chemicals and fuels, drawing significant attention from both academia and industry. This work proposes an in‐situelectrodeposition method to prepare indium‐doped copper (Cu)‐based catalysts on carbon paper (Cu100Inx‐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 Cu100Inx‐CP were used for CO2RR to produce multi‐carbon (C2+) products. Characterization results showed that In was highly dispersed in the Cu particles at x<5.1. The Cu100In5.1‐CP (containing 0.95 wt% In based on Cu) was very efficient for electrocatalytic CO2RR. The in‐situ Raman spectroscopy showed that Cu100In5.1‐CP enhanced *CO intermediate adsorption and promoted the production of C2+ 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 C2+ products in CO2RR.