Journal
CHEMICAL ENGINEERING JOURNAL
Volume 395, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.125160
Keywords
CoP/CeO2 heterostructure; Interface engineering; Oxygen vacancies; Oxygen evolution reaction; Zn-air battery
Categories
Funding
- National Natural Science Foundation of China [21875112]
- National and Local Joint Engineering Research Center of Biomedical Functional Materials
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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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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