Selective CO2 conversion to formate in water using a CZTS photocathode modified with a ruthenium complex polymer

Highly selective photoelectrochemical CO2 reduction (> 80% selectivity) in water was successfully achieved by combining Cu2ZnSnS4 (CZTS) with a metal-complex electrocatalyst. CZTS, a sulfide semiconductor that possesses a narrow band gap and consists of earth-abundant elements, is demonstrated to be a candidate photoabsorber for a CO2 reduction hybrid photocatalyst.