Selective Electrochemical CO 2 Reduction to Ethylene or Ethanol via Tuning *OH Adsorption

Abstract Selective electrocatalytic reduction of carbon dioxide (CO 2 RR) into ethylene (C 2 H 4 ) or ethanol (C 2 H 5 OH) is a high challenge. In this study, the rational manipulation of Cu defect sites was realized for the selective formation of C 2 H 5 OH and C 2 H 4 . Low‐coordination amorphous and medium‐coordination grain‐boundary Cu defect sites with different *OH affinity were found to play a decisive role in the selective protonation of CH 2 CHO*. In particular, grain‐boundary‐rich Cu (denoted as Cu‐1) that weakly adsorbed *OH and CH 2 CHO* favored the protonation on β‐C of CH 2 CHO*, leading to the selective production of C 2 H 5 OH. In contrast, amorphous Cu defect sites (denoted as Cu‐3) showed…

• NN
  National Natural Science Foundation of China

  Awards: 22308246, 22478278