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Ultrasmall FeNi3N particles with exposed active (110) surface anchored on nitrogen-doped graphene for multifunctional electrocatalysts

Abstract

High-performance multifunctional catalysts are very important to various energy conversion and storage devices. FeNi bimetal electrocatalysts have been reported to have good activities toward oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), but negligible oxygen reduction reaction (ORR) activity. Herein, we report an advanced multifunctional electrocatalyst based on 7.6 nm FeNi3N nanoparticle anchored on N-doped graphene (FeNi3N/NG). The as-prepared FeNi3N/NG exhibits not only excellent OER and HER activities, but also unprecedented ORR activity in alkaline media. The density functional theory (DFT) calculations demonstrate that FeNi3N with active (110) surface has stronger capability for O2 adsorption and cleavage of O-O band than Ni4N, leading to significantly enhanced ORR activity of the FeNi3N nanoparticles. As a result, the specific capacity of primary FeNi3N/NG-based Zn-air battery is as high as 785.2 mAh g-1 at 10 mA cm-2, higher than that assembled with benchmarked Pt/C+IrO2 catalyst. Besides, the overall water splitting device with the FeNi3N/NG electrode material drives 20 mA cm-2 at 1.585 V, outperforming electrolyzers assembled with the state-of-the-art bifunctional catalysts. Our results highlight the importance of the fabrication of ultrasmall-sized electrocatalysts with exposed active surface to development of renewable energy conversion and storage devices.

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Publication details

The article was received on 19 Oct 2018, accepted on 01 Dec 2018 and first published on 04 Dec 2018


Article type: Paper
DOI: 10.1039/C8TA10083G
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Ultrasmall FeNi3N particles with exposed active (110) surface anchored on nitrogen-doped graphene for multifunctional electrocatalysts

    L. Liu, F. Yan, K. Li, C. Zhu, Y. Xie, X. Zhang and Y. Chen, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA10083G

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