A Non-Macrocycle Thiolate-Based Cobalt Catalyst for Selective O₂ Reduction into H₂O

The reduction of dioxygen to produce selectively H2O2 or H2O is crucial in various fields. While platinum-based materials excel in 4H(+)/4e(-) oxygen reduction reaction (ORR) catalysis, cost and resource limitations drive the search for cost-effective and abundant transition metal catalysts. It is thus of great importance to understand how the selectivity and efficiency of 3d-metal ORR catalysts can be tuned. In this context, we report on a Co complex supported by a bisthiolate N2S2-donor ligand acting as a homogeneous ORR catalyst in acetonitrile solutions both in the presence of a one-electron reducing agent (selectivity for H2O of 93 % and TOFi=3 000 h(-1)) and under electrochemically-assisted conditions (0.81 V 更多