Inducing Fe 3d Electron Delocalization and Spin-State Transition of FeN4 Species Boosts Oxygen Reduction Reaction for Wearable Zinc–Air Battery

Shengmei Chen; Xiongyi Liang; Sixia Hu; Xinliang Li; Guobin Zhang; Shuyun Wang; Longtao Ma; Chi-Man Lawrence Wu; Chunyi Zhi; Juan Antonio Zapien

doi:10.1007/s40820-023-01014-8

Nano-Micro Letters (Feb 2023)

Inducing Fe 3d Electron Delocalization and Spin-State Transition of FeN4 Species Boosts Oxygen Reduction Reaction for Wearable Zinc–Air Battery

Shengmei Chen,
Xiongyi Liang,
Sixia Hu,
Xinliang Li,
Guobin Zhang,
Shuyun Wang,
Longtao Ma,
Chi-Man Lawrence Wu,
Chunyi Zhi,
Juan Antonio Zapien

Affiliations

Shengmei Chen: Department of Materials Science and Engineering, City University of Hong Kong
Xiongyi Liang: Department of Materials Science and Engineering, City University of Hong Kong
Sixia Hu: Sustech Core Research Facilities, Southern University of Science and Technology
Xinliang Li: Department of Materials Science and Engineering, City University of Hong Kong
Guobin Zhang: Tsinghua Shenzhen International Graduate School, Tsinghua University
Shuyun Wang: Department of Materials Science and Engineering, City University of Hong Kong
Longtao Ma: Frontiers Science Center for Flexible Electronics, Institute of Flexible Electronics, Northwestern Polytechnical University
Chi-Man Lawrence Wu: Department of Materials Science and Engineering, City University of Hong Kong
Chunyi Zhi: Department of Materials Science and Engineering, City University of Hong Kong
Juan Antonio Zapien: Department of Materials Science and Engineering, City University of Hong Kong

DOI: https://doi.org/10.1007/s40820-023-01014-8
Journal volume & issue: Vol. 15, no. 1
pp. 1 – 17

Abstract

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Highlights The strong interaction between Ti3C2Sx and FeN4 species induces the central metal Fe(II) in FeN4 species with intermediate spin state transferred to high spin state, in which the latter is favorable to initiate the reduction of oxygen. This strong interaction induces a remarkable Fe 3d electron delocalization with d band center upshift, boosting oxygen-containing groups adsorption on FeN4 species and oxygen reduction reaction kinetics. The resulting FeN4–Ti3C2S x with FeN4 moieties in high spin state exhibits high half-wave potential of 0.89 V vs. RHE and high limiting current density of 6.5 mA cm−2, enabling wearable zinc–air battery showing a good discharge performance with a maximum power density of 133.6 mW cm−2.

Published in Nano-Micro Letters

ISSN: 2311-6706 (Print); 2150-5551 (Online)
Publisher: SpringerOpen
Country of publisher: Germany
LCC subjects: Technology
Website: http://www.springer.com/40820

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