Low‐Crystalline AuCuIn Catalyst for Gaseous CO 2 Electrolyzer

Despite its importance for the establishment of a carbon‐neutral society, the electrochemical reduction of CO 2  to value‐added products has not been commercialized yet because of its sluggish kinetics and low selectivity. The present work reports the fabrication of a low‐crystalline trimetallic (AuCuIn) CO 2  electroreduction catalyst and demonstrates its high performance in a gaseous CO 2  electrolyzer. The high Faradaic efficiency (FE) of CO formation observed at a low overpotential in a half‐cell test is ascribed to the controlled crystallinity and composition of this catalyst as well as to its faster charge transfer, downshifted d‐band center, and low oxophilicity. The gaseous CO 2  electrolyzer with the optimal catalyst as the cathode exhibits superior cell performance with a high CO FE and production rate, outperforming state‐of‐the‐art analogs. Thus, the obtained results pave the way to the commercialization of CO 2  electrolyzers and promote the establishment of a greener society.