Affiliation:
1. State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 P. R. China
2. College of Chemistry and Chemical Engineering Central South University Changsha 410083 P. R. China
3. Institute of Industrial Catalysis State Key Laboratory Breeding Base of Green‐Chemical Synthesis Technology College of Chemical Engineering Zhejiang University of Technology Hangzhou 310032 P. R. China
4. Chemistry and Chemical Engineering of Guangdong Laboratory Shantou 515063 P. R. China
Abstract
AbstractThe rational design and construction of efficient and inexpensive bifunctional oxygen electrocatalysts are highly desirable for the development of rechargeable Zn–air batteries (ZABs). Although single‐atom Fe sites anchored on N‐doped carbon catalysts (Fe1/NC) ensure high oxygen reduction reaction activity, their unitary atomically dispersed active center faces difficult condition in catalyzing oxygen evolution reaction simultaneously. Herein, a composite catalyst containing heterointerface between Fe1/NC and selenides ((Fe,Co)Se2) is constructed. The obtained (Fe,Co)Se2@Fe1/NC exhibits extremely narrow potential gap of 0.616 V and remarkable stability in alkaline media, outperforming the benchmark catalysts (Pt/C+RuO2: 0.720 V). Experimental results and density functional theory calculations reveal that heterointerface between Fe1/NC and (Fe,Co)Se2 accelerates the electron transfer and provides more moderate adsorption sites, which endow (Fe,Co)Se2@Fe1/NC with extremely high bifunctional oxygen catalytic activity. This study not only provides a superior bifunctional catalyst for ZABs, but also enriches the application of single‐atom catalysts in multifunctional energy storage and conversion devices.
Funder
National Natural Science Foundation of China
State Key Laboratory of Powder Metallurgy
Subject
Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials
Cited by
40 articles.
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