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Research Article

Ultrastable bimetallic Fe2Mo for efficient oxygen reduction reaction in pH-universal applications

Jue Hu1,§( ), Chengxu Zhang1,§, Mingzi Sun2, Qianglong Qi1, Shanxiong Luo1, Hongchuan Song3, Jingyi Xiao4, Bolong Huang2( ), Michael K. H. Leung4( ), Yingjie Zhang1( )
The Engineering Laboratory of Advanced Battery and Materials of Yunnan Province, Kunming University of Science and Technology, Kunming 650093, China
Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
School of Energy and Environment Science, Yunnan Normal University, Kunming 650500, China
Ability R&D Energy Research Centre, School of Energy and Environment, City University of Hong Kong, Hong Kong, China

§ Jue Hu and Chengxu Zhang contributed equally to this work.

Show Author Information

Graphical Abstract

The earth-abundant elements based electrocatalyst Fe2Mo has been constructed to realize theefficient and ultrastable oxygen reduction reactions in both acidic and alkaline environments. Thiswork will inspire more research works in developing efficient and durable low-cost electrocatalystsfor different applications.

Abstract

Iron-based nanostructures represent an emerging class of catalysts with high electroactivity for oxygen reduction reaction (ORR) in energy storage and conversion technologies. However, current practical applications have been limited by insufficient durability in both alkaline and acidic environments. In particular, limited attention has been paid to stabilizing iron-based catalysts by introducing additional metal by the alloying effect. Herein, we report bimetallic Fe2Mo nanoparticles on N-doped carbon (Fe2Mo/NC) as an efficient and ultra-stable ORR electrocatalyst for the first time. The Fe2Mo/NC catalyst shows high selectivity for a four-electron pathway of ORR and remarkable electrocatalytic activity with high kinetics current density and half-wave potential as well as low Tafel slope in both acidic and alkaline medias. It demonstrates excellent long-term durability with no activity loss even after 10,000 potential cycles. Density functional theory (DFT) calculations have confirmed the modulated electronic structure of formed Fe2Mo, which supports the electron-rich structure for the ORR process. Meanwhile, the mutual protection between Fe and Mo sites guarantees efficient electron transfer and long-term stability, especially under the alkaline environment. This work has supplied an effective strategy to solve the dilemma between high electroactivity and long-term durability for the Fe-based electrocatalysts, which opens a new direction of developing novel electrocatalyst systems for future research.

Keywords

oxygen reduction reactionFe2Mo bimetallic nanoparticles zeolitic imidazolate frameworks (ZIFs)ultralong stabilitysuperior oxygen reduction reaction (ORR) performance

Electronic Supplementary Material

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Nano Research
Volume 15 Issue 6,
June 2022
Pages 4950-4957
DOI: 10.1007/s12274-022-4112-1
Cite this article:
Hu J, Zhang C, Sun M, et al. Ultrastable bimetallic Fe2Mo for efficient oxygen reduction reaction in pH-universal applications. Nano Research, 2022, 15(6): 4950-4957. https://doi.org/10.1007/s12274-022-4112-1
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Received: 27 November 2021
Revised: 22 December 2021
Accepted: 22 December 2021
Published: 10 March 2022
© Tsinghua University Press 2022
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