Synergistic doping and tailoring: Realizing in depth modulation on valence state of CoFe spinel oxide for high-efficiency water oxidation

Modifying the valence of metal active center to the favorable configuration offers a promising strategy to promote the electrocatalytic performance of water splitting. For example, Co2+ is reported to show better performance of water oxidation than Co3+ in the Co-based spinel oxide, but its adjustment degree is small due to the geometrical occupation and the uniform synthetic environment. In this work, on the basis of chemical tailoring for the...