Interface Engineering of Flower-like Co 2 P/WO 3-x /Carbon Cloth Catalysts with Oxygen Vacancies for Efficient Oxygen Evolution Reaction

The Constructing an efficient and low-cost oxygen evolution reaction (OER) electrocatalyst is critical for improving the performance of electrolysis in alkaline water. In this study, a self-supported electrocatalyst of flower-like cobalt phosphide and tungsten oxide (Co P/WO /CC) was prepared on carbon cloth (CC) surface by hydrothermal reaction with solution immersion etching and phosphorization annealing under H /Ar atmosphere. This strategy can generate oxygen vacancies (O ), improving the speed of charge transfer between cobalt phosphide (Co P) and tungsten oxide (WO ) components. The catalyst greatly increases the electrochemical active surface area, which is beneficial for efficient oxygen evolution. Electrochemical testing studies show that in 1.0 M KOH solution, Co P-WO /CC catalyst exhibits good OER activity, with a low overpotential of 254 mV at 10 mA cm , a small Tafel slope of 58.32 mV dec . The synergistic effect of oxygen vacancies and Co P with WO can regulate electronic structures, expose more active sites, and cooperatively enhancing the OER activity. This study provides a workable strategy for preparing efficient non-noble metal OER electrocatalysts on engineered interfaces and O .