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Ni3S2 nanocrystals in-situ grown on Ni foam as highly efficient electrocatalysts for alkaline hydrogen evolution

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Abstract

The exploitation of cost-efficient electrocatalysts is critical to develop the hydrogen evolution reaction (HER) for hydrogen production. Herein, Ni3S2/NF-x h (x = 12, 16 and 20, reaction time) nanocrystals in-situ grown on Ni foam (NF) were prepared via a facile hydrothermal method. The results demonstrate that the reaction time plays key roles in the morphology, the hydrogen evolution performance of the samples, and the hydrogen brittleness of NF substrate. Interestingly, the Ni3S2/NF-16 h displays outstanding catalytic activity for HER in alkaline solution and avoids the hydrogen brittleness of the NF skeletons simultaneously. To afford a catalytic current of 20 mA·cm−2, Ni3S2/NF-16 h presents ultra-low overpotential of 48 mV for hydrogen evolution and sufficient stability for 40 h. Moreover, the density functional theory (DFT) calculations revealed that the excellent electrocatalytic HER activity of Ni3S2 could be attributed to its exposed (015) plane, which exhibited good capability for water adsorption and dissociation in an alkaline electrolyte, leading to the optimal free energy for H* adsorption. The present work offers a novel strategy to design, synthesize and develop highly efficient electrocatalysts for HER.

Graphical abstract

摘要

开发低成本、高效益的电催化剂是发展析氢反应制氢的关键。在此基础上，采用水热法原位制备了Ni3S2/NF-x h (x = 12,16和20)纳米晶体。结果表明，反应时间对样品的形貌、析氢性能和泡沫镍基底的氢脆性有重要影响。有趣的是，Ni3S2/NF-16 h在碱性溶液中表现出优异的析氢催化活性，同时避免了泡沫镍骨架的氢脆性。在20 mAcm-2的电流密度下，Ni3S2/NF-16 h展示了48 mV的超低析氢过电位和超过40 h的优异稳定性。此外，密度泛函理论计算表明，Ni3S2优异的电催化析氢反应活性主要可归因于(015)晶面，在碱性电解质中表现出良好的水吸附和解离能力，从而获得最佳的H*吸附自由能。本工作为设计、合成和开发高效的析氢反应催化剂提供了一种新的策略。

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Acknowledgements

This study was financially supported by the Project of Talent Recruitment of Guangdong University of Petrochemical Technology (Nos. 2019rc052 and 2019rc054).

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  1. Rui Sun and Zhan-Hua Su have contributed equally to this work.

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  1. College of Chemistry, Guangdong University of Petrochemical Technology, Maoming, 525000, China

    Rui Sun, Zhan-Hua Su, Zhi-Feng Zhao & Tian-Sheng Li

  2. College of Chemistry and Chemical Engineering, Harbin Normal University, Harbin, 150025, China

    Rui Sun, Mei-Qi Yang, Tian-Sheng Li, Jing-Xiang Zhao & Yong-Chen Shang

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Sun, R., Su, ZH., Zhao, ZF. et al. Ni3S2 nanocrystals in-situ grown on Ni foam as highly efficient electrocatalysts for alkaline hydrogen evolution. Rare Met. 42, 3420–3429 (2023). https://doi.org/10.1007/s12598-023-02337-6

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