Interface engineering of oxygen-vacancy-rich CoP/CeO2 heterostructure boosts oxygen evolution reaction

By Meng Li, Xingchi Pan, Mengqi Jiang, Yifang Zhang, Yawen Tang, G. Fu. Chemical Engineering Journal, 2020

229 citations recorded by the source corpus.

Abstract Exploring cost-effective and high-efficiency electrocatalyst for the oxygen evolution reaction (OER) is critical for renewable energy conversion and storage. Herein, we report a novel and high-efficiency OER catalyst by simply interface engineering of CoP nanosheets and CeO2 nanoparticles. Such interface-regulated strategy triggers the generation of abundant oxygen vacancies and more catalytically active sites on the surface of CoP/CeO2 heterostructure; while regulates the electronic structure of CoP and CeO2 resulting in fast charge-transfer capacity. For the OER, the CoP/CeO2 heterostructure exhibits an extremely low overpotential of about 224 mV at 10 mA cm−2, which is superior to that of CoP (380 mV), CeO2 (628 mV) and RuO2 (355 mV) counterparts. Furthermore, a high-power rechargeable Zn-air battery with impressive long-life cycling stability (over 500 cycles) is demonstrated based on CoP/CeO2 + Pt/C as the air–cathode. The present findings not only place CoP/CeO2 heterostructure as an outstanding electrocatalyst for the OER, but also offer a promising interface-regulated strategy for the development of high-performance electrocatalyts.

Subfields: Electrical and Electronic Engineering, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/91b9e1a649267b37fbed6f623ebfbf9175e59b4c