Constructing Double-Layer CoP/CeO<sub>2</sub>–FeO<sub><i>x</i></sub>H Hybrid Catalysts for Alkaline and Neutral Water Splitting
Ya Tan, Qijun Che, Qing Li
Abstract
There is a great challenge in designing bifunctional electrocatalysts with low-cost and high-efficiency for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline and neutral electrolytes. In this work, a double-layer CoP/CeO2–FeOxH mixed catalyst is successfully prepared by a two-step electrodeposition process as a bifunctional electrocatalyst in alkaline and neutral solutions. The CoP/CeO2–FeOxH catalytic electrode in alkaline and neutral solutions exhibits overpotentials of 37 for HER and 248 for OER at 10 mA cm–2. The cell voltages of the whole electrolyzed water in alkaline and neutral media are 1.53 and 1.82 V at the current density of 10 mA cm–2, respectively. Moreover, this catalyst also shows a significant balance between catalytic activity and stability. This work not only provides a new strategy for the preparation of double-layer composite materials but also provides an experimental reference for the industrial development of electrolyzed water in alkaline or neutral solutions.