This timely and comprehensive review mainly summarizes advances in heterogeneous electroreduction of CO2: from fundamentals to value-added products.

A novel OER electrocatalyst, namely oxygen-incorporated amorphous cobalt sulfide porous nanocubes (A-CoS O PNCs), show advantages over the benchmark RuO catalyst in alkaline/neutral medium. Experiments combining with calculation demonstrate that the desirable O* adsorption energy, associated with the distorted CoS O octahedron structure and the oxygen doping, contribute synergistically to the outstanding electrocatalytic activity.