Remarkable decrease in overpotential of oxalate formation in electrochemical CO ₂ reduction by a metal–sulfide cluster

Triangular metal–sulfide clusters, [{Ir(C5Me5)}3(µ3-S)2]2+ and [{Co(C5H4Me)}3(µ3-S)2]2+, catalyse the electrochemical CO2 reduction to selectively produce oxalate at –1.30 and –0.70 V (vs. Ag/AgCl), respectively, in MeCN.