期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 813, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.152192
关键词
Metal-organic frameworks; Nanoflower; Core@shell structure; Metal-carbon composite; Oxygen evolution reaction; Electrocatalysis
资金
- National Natural Science Foundation of China [51602301, 51672251]
- Fundamental Research Funds of Zhejiang Sci-Tech University [2019Q007]
Developing high-performance and cost-effective electrocatalysts for oxygen evolution reaction (OER) is crucial to renewable energy conversion and storage technologies. Herein, bimetallic N-doped carbon electrocatalysts with various morphologies are derived from Hofmann-type metal-organic frameworks by carbonization and oxidization. Notably, the flower-like nano-catalyst FeNi@OCNF exhibits core@shell structure, hierarchical pore network and large specific surface area (331.3 m(2) g(-1)), leading to tunable electronic structure, efficient mass transfer as well as abundant exposed active sites. Moreover, the formative FeCx, NiO and FeNi bimetal mutually optimize electronic structure of graphitic layer, conducing to high property. FeNi@OCNF demonstrates an excellent OER performance with a low overpotential of 281 mV at 10 mA cm(-2), signally outperforming the other catalyst CoNi@OCNP (373 mV) and commercial IrO2 (308 mV), and also owns long-term stability. The result may inspire more design of MOF-derived catalysts with multiscale structures and multi-components for various electrochemical energy conversion devices. (C) 2019 Elsevier B.V. All rights reserved.
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