Crystalline and amorphous phases combined Ni3S2/NF promotes water electrolysis under alkaline fluctuating power supply

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-10-06 DOI:10.1016/j.jallcom.2025.184210

Jiayun Zeng, Zhaotian Chen, Juan Wang, Gaofeng Zeng, Qin Zhong

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Abstract

Direct coupling of renewable energy sources with water electrolysis for hydrogen production is critical to further reduce hydrogen costs and advance low-carbon development. To this end, a nickel foam-supported Ni₃S₂-2.0/NF electrocatalyst featuring amorphous-crystalline heterostructure is proposed. Ni₃S₂-2.0/NF demonstrates exceptional hydrogen evolution reaction (HER) performance, achieving ultralow overpotentials of 49 mV at 10 mA cm^-2 with 140 h stability. Under simulated renewable energy fluctuations (50 h accelerated degradation testing), Ni₃S₂-2.0/NF exhibits superior fluctuation resilience, showing the lowest 4.2% HER current density decay. Further investigation reveals that increasing the fluctuation frequency exacerbates current density decay. Critically, a two-electrode electrolyzer assembled with Ni₃S₂-2.0/NF enables direct solar-driven hydrogen production without power converters.

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Ni3S2/NF复合晶相和非晶相促进碱性波动电源下的水电解

可再生能源与水电解直接耦合制氢对于进一步降低氢成本和推进低碳发展至关重要。为此，提出了一种具有非晶异质结构的泡沫镍负载Ni3S2-2.0/NF电催化剂。Ni3S2-2.0/NF表现出优异的析氢反应（HER）性能，在10 mA cm-2下实现了49 mV的超低过电位，稳定性为140 h。在模拟可再生能源波动（50 h加速降解测试）下，Ni3S2-2.0/NF表现出优异的波动弹性，其电流密度衰减最小，为4.2%。进一步的研究表明，波动频率的增加加剧了电流密度的衰减。关键是，由Ni3S2-2.0/NF组装的双电极电解槽可以在没有电源转换器的情况下直接由太阳能驱动制氢。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.