Fe, Mo co-doping enhances the OER performance of nickel sulfide nanoflakes for seawater electrolysis

IF 5.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2024-11-10 DOI:10.1016/j.jallcom.2024.177480

Yunjuan Tao, Zhikun Xu, Rui Yan, Yujing Sun, Shuangyan Lin

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Abstract

Development of efficient and corrosion-resistant catalysts for oxygen evolution reaction (OER) offers great promise for seawater electrolysis but remains a challenge. Herein, Fe, Mo-co-doped NiS/Ni₃S₂ (FeMo-NiS_y) rough nanoflakes array on Ni foam has been developed as a high-efficiency OER electrocatalyst for seawater electrolysis. The optimal electrode Fe_0.05Mo-NiS_y only requires an overpotential of 289 mV to drive 100 mA cm^-2 for seawater oxidation, which is 194 mV lower than that of NiS_y (483 mV). Based on the experiments and density functional theory (DFT) calculations, the significantly enhanced OER activity can be attributed to the modified electronic structure and the reduced free energy of the potential-limiting step after co-doping of Fe and Mo. Importantly, the Fe_0.05Mo-NiS_y electrode presents great durability in simulated seawater and natural seawater due to the good corrosion resistance. This study provides new insight into bimetallic co-doping sulfides for seawater oxidation.

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铁、钼共掺杂增强了用于海水电解的硫化镍纳米片的 OER 性能

开发高效、耐腐蚀的氧进化反应（OER）催化剂为海水电解带来了巨大前景，但仍是一项挑战。在此，我们在镍泡沫上开发了铁钼共掺杂的 NiS/Ni3S2（FeMo-NiSy）粗糙纳米片阵列，作为用于海水电解的高效 OER 电催化剂。最佳电极 Fe0.05Mo-NiSy 只需要 289 mV 的过电位就能驱动 100 mA cm-2 的海水氧化，比 NiSy（483 mV）低 194 mV。根据实验和密度泛函理论（DFT）计算，OER 活性的显著增强可归因于铁和钼共掺杂后电子结构的改变和限势步骤自由能的降低。重要的是，由于具有良好的耐腐蚀性，Fe0.05Mo-NiSy 电极在模拟海水和天然海水中具有很好的耐久性。这项研究为双金属共掺硫化物用于海水氧化提供了新的见解。

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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.