Interface engineering of oxygen-vacancy-rich CoP/CeO2 heterostructure boosts oxygen evolution reaction
Li, M (Li, Meng)[ 1 ] ; Pan, XC (Pan, Xingchi)[ 1 ] ; Jiang, MQ (Jiang, Mengqi)[ 1 ] ; Zhang, YF (Zhang, Yifan)[ 1 ] ; Tang, YW (Tang, Yawen)[ 1 ]*（唐亚文） ; Fu, GT (Fu, Gengtao)[ 2,3 ]*

[ 1 ]Nanjing Normal Univ, Jiangsu Collaborat Innovat Ctr Biomed Funct Mat, Sch Chem & Mat Sci, Jiangsu Key Lab New Power Batteries, Nanjing 210023, Peoples R China
[ 2 ]Univ Texas Austin, Mat Sci & Engn Program, Austin, TX 78712 USA
[ 3 ]Univ Texas Austin, Texas Mat Inst, Austin, TX 78712 USA

CHEMICAL ENGINEERING JOURNAL，202009,395， 125160

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.

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