Structure‐Tunable Copper–Indium Catalysts for Highly Selective CO2 Electroreduction to CO or HCOOH

Abstract Selectively approaching chemicals with one composition‐tunable catalyst is attractive for practical manufacturing. Bimetallic copper–indium (Cu–In) catalysts have been synthesized by using a coprecipitation method and found to be among the best reported In‐based catalysts for electrochemical CO 2 reduction to CO or HCOOH. By varying the metal ratio, the catalyst can be tuned from a core–shell structure that selectively produces CO to a well‐mixed structure that prefers HCOOH production. The distinct selectivities depend on the structure‐sensitive binding strength of key reactive intermediates. These findings can benefit the development of a broader range of selectivity‐tunable catalysts.