LAUSR

Abstract It is essential that the development of efficient and excellent stability electrocatalysts for water oxidation, which could covert effectively renewable electricity to chemical energy. Herein, it is fabricated firstly in situ that a novel Au–Bi anode oxygen-evolving catalyst with an outstanding catalytic performance for water splitting by electrolytic deposition from dilute AuCl4− solutions in potassium tetraborate electrolyte at pH 11. The H2 generated for water splitting rate of the Au–Bi is 116.38 μmol cm−2 h−1 and the Faradaic efficiency reaches 90.43% in 0.1 M tripotassium phosphate solution. Moreover, the main active component of the Au–Bi is gold oxide (Au2O3). What is more, this work expands the research on Au-based oxygen-evolving catalysts and provides increased insight into water splitting.