LAUSR

Herein, vanadium-doped cobalt carbonate hydroxide, V-CoCH, for efficient water splitting were synthesized. V species were partially dissoluted easily in the early stage of OER, inducing the catalyst surface self-etching, which was helpful to the catalyst surface reconstruction and resulted in more plentiful active sites and oxygen vacancies. Synergy of V-doping and oxygen vacancies was quite favor of improvement of the activity. V-CoCH shown an exceptional OER catalytic performance with an overpotential (183 mV at 10 mA·cm-2). The water splitting cell composed of V-CoCH only acquired 1.52 V to reach 10 mA·cm-2. Theoretical calculations revealed that V of V-CoCH played an important role in electron regulation of active sites. Oxygen vacancies induced had an important effect on improvement of the OER performance via not only the exposure of more active sites but also modulation of electronic structures. This work provides an effective strategy for constructing high-performance electrocatalysts.