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It remains challenging to develop economical and bifunctional electrocatalysts toward oxygen/hydrogen evolution reactions (OER/HER). Herein, we construct Co9S8 nanoflakes decorated Co3O4 nanoarrays with enriched heterogeneous interface zones on Ni foam (Co9S8@Co3O4/NF) via a novel step-wise approach. The Co9S8@Co3O4/NF hybrid manifests excellent performance with low overpotentials of 130 mV for HER (10 mA·cm–2) and 331 mV for OER (100 mA·cm–2), delivering a small voltage of 1.52 V for water splitting at 10 mA·cm–2 as well as outstanding catalytic durability, which surpasses precious metals and previously reported earth-abundant nanocatalysts. Further experimental and theoretical investigations demonstrate that the excellent performance is attributed to the followings: (ⅰ) Highly conductive Ni facilitates the efficient charge transfer; (ⅱ) porous core-shell nanoarchitecture benefits the infiltration and transportation of gases/ions; (ⅲ) heterogeneous interface zones synergistically lower the chemisorption energy of hydrogen/oxygen intermediates. This work will shed light on the controllable synthesis and engineering of heterostructure nanomaterials for clean energy storage and conversion technologies.

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Publication history

Received: 30 March 2021
Revised: 27 May 2021
Accepted: 30 May 2021
Published: 19 August 2021
Issue date: February 2022

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© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2021

Acknowledgements

This work was supported by the National Natural Science Foundation of China (51972224).

This work was supported by the National Natural Science Foundation of China (51972224).

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Reprints and Permission requests may be sought directly from editorial office.
Email: nanores@tup.tsinghua.edu.cn

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