Improving MoS2 hydrogen evolution performance in anion exchange membrane water electrolysis by using LaNi5 alloy as a co-catalyst

IF 5.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-04-14 DOI:10.1016/j.jallcom.2025.180420

Hao Shang , Hang Shi , Haoliang Yu , Xiaohong Hu , Yan Xia

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引用次数: 0

Abstract

To develop high-performance non-precious metal hydrogen evolution reaction HER catalysts for anion exchange membrane water electrolysis (AEMWE) and address the issue of the rate of Volmer step in HER being limited by H₂O dissociation in alkaline media, we propose a strategy where LaNi₅ alloy is used as a co-catalyst for the adsorption and activation of H*, thereby accelerating the rate of the HER. We find that LaNi₅ has a significant HER synergistic effect with MoS₂. The overpotential at 10 mA·cm⁻¹ for HER catalyzed by the LaNi₅-MoS₂ composite catalyst is only 143 mV in 1.0 M KOH solution, and the AEMWE using LaNi₅-MoS₂ as cathode catalyst reaches 1.966 V at 1.0 A·cm⁻² and shows a low degradation. Mechanism studies suggest that LaNi₅ plays the role of adsorbing and activating H*, and the enriched H* from LaNi₅ overflows to MoS₂, which has good H₂ desorption sites, resulting in improved HER kinetics of LaNi₅-MoS₂.

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为了开发用于阴离子交换膜电解水（AEMWE）的高性能非贵金属氢进化反应 HER 催化剂，并解决 HER 中 Volmer 步骤的速率受限于碱性介质中 H2O 解离的问题，我们提出了一种策略，即使用 LaNi5 合金作为吸附和活化 H* 的辅助催化剂，从而加快 HER 的速率。我们发现 LaNi5 与 MoS2 具有显著的 HER 协同效应。在 1.0 M KOH 溶液中，LaNi5-MoS2 复合催化剂催化的 HER 在 10 mA-cm-1 时的过电位仅为 143 mV，而使用 LaNi5-MoS2 作为阴极催化剂的 AEMWE 在 1.0 A-cm-² 时达到 1.966 V，降解率很低。机理研究表明，LaNi5 起着吸附和活化 H* 的作用，LaNi5 中富集的 H* 溢出到具有良好 H2 解吸位点的 MoS2 上，从而改善了 LaNi5-MoS2 的 HER 动力学。

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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.