Highly efficient and stable indium single-atom catalysts for electrocatalytic reduction of CO 2 to formate.

Indium single-atom catalysts display a large total current density (38.94 to 81.08 mA cm -2 ) over an extensive potential window (-0.91 to -1.41 V vs. RHE) for electrocatalytic CO 2 reduction to formate with high selectivity (85.2% faradaic efficiency at -1.31 V).