LAUSR

Herein, a transition metal dissolution-oxygen vacancy strategy, based on dissolution of highly oxidized transition metal species in alkaline electrolyte, was suggested to construct high-performance amorphous Co(OH) 2 /WO x (a-CoW) catalyst for OER. The surface reconstruction of a-CoW and its evolution were described by regulating oxygen vacancies. As shown, with continuous dissolution of W species, oxygen vacancies on the surface were generated rapidly, and the surface reconstruction was promoted, and the OER performance was improved significantly. During the surface reconstruction, W species also played a role in electronic modulation for Co. Due to its rapid surface reconstruction, a-CoW exhibited the excellent OER performance in alkaline electrolyte with an overpotential of 208 mV at 10 mA·cm -2 and had the long-term stability for at least 120 h. This work shows that the transition metal dissolution-oxygen vacancy strategy is effective for preparation of high-performance catalysts.