Cu7S4 nanosheets enriched with Cu–S bond for highly active and selective CO2 electroreduction to formate

Cu 7 S 4 nanosheets enriched with Cu–S bond can facilitate the kinetics of CO 2 electroreduction to HCOO − and suppress the formation of *CO as a result of the high FE of HCOO − (82.7%) and high partial current density (456 mA cm −2 ).