Superior Water Oxidation Performance over CoMoO 4 with High Stability: Synergistic Effect of Oxygen Vacancies and Morphology

Abstract It is utmost significant to exploit environmentally friendly, low‐cost and robust electrocatalysts because of the slow kinetics involved in production of hydrogen through water electrolysis on a large scale. The bimetallic CoMoO 4 materials were in situ grown on Ni foam by simple hydrothermal synthesis method. The as‐prepared CoMoO 4 materials with oxygen vacancy display superior electrocatalytic performance compared to the pristine CoMoO 4 electrodes, demanding a small OER overpotential of 340 mV to obtain 40 mA cm −2 . The superior electrocatalytic performance of the CoMoO 4 material was ascribed to the presence of more oxygen deficiency, optimal water adsorption energy and more exposure to active sites. The work provides a novel thought and method for the exploitation of environmentally friendly, robust and low‐cost water splitting electrocatalysts.