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Engineering cobalt sulfide/oxide heterostructure with atomically mixed interfaces for synergistic electrocatalytic water splitting

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Abstract

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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Acknowledgements

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

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  1. Xiaoyang Wang and Yu He contributed equally to this work.

Authors and Affiliations

  1. School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin, 300072, China

    Xiaoyang Wang, Yu He, Xiaopeng Han, Jun Zhao, Jinfeng Zhang, Cheng Zhong, Yida Deng & Wenbin Hu

  2. School of Materials Science and Engineering, Hebei University of Technology, Tianjin, 300130, China

    Lanlan Li

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  1. Xiaoyang Wang
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Engineering cobalt sulfide/oxide heterostructure with atomically mixed interfaces for synergistic electrocatalytic water splitting

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Wang, X., He, Y., Han, X. et al. Engineering cobalt sulfide/oxide heterostructure with atomically mixed interfaces for synergistic electrocatalytic water splitting. Nano Res. 15, 1246–1253 (2022). https://doi.org/10.1007/s12274-021-3632-4

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