碳支撑镍钴铁铜镁高熵合金纳米催化剂对 MgH2 储氢性能的催化效应

IF 15.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys Pub Date : 2025-03-01 DOI:10.1016/j.jma.2024.04.031

Yafei Liu, Mengyuan Yue, Yusang Guo, Yaru Jiang, Yu Sun, Lizhuang Feng, Yijing Wang

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引用次数: 0

摘要

高熵合金（HEA）基材料以其独特的性能作为储氢催化剂得到了广泛的研究。在此，我们展示了一种相对温和的合成策略，利用多金属金属有机框架（MOFs）作为前体构建碳负载的NiCoFeCuMg HEA （NiCoFeCuMg@C）纳米催化剂。将制备好的催化剂掺入MgH2中，大大提高了储氢性能：MgH2+NiCoFeCuMg@C复合材料在325℃下可以快速解吸6.01 wt%的H2，初始脱氢温度降至167.2℃，比纯MgH2低近163.8℃。此外，该复合材料具有相当稳定的可逆容量，经过20次循环后容量保持率为97%。最重要的是，非原位结构表征揭示了Mg2Ni(Cu)/Mg2Ni(Cu)H4的“氢泵”作用和Co3Fe7的“氢门户”作用的协同效应，以及碳材料优异的分散功能，是MgH2+NiCoFeCuMg@C复合材料具有优异储氢性能的原因。本研究为碳负载HEA催化剂在MgH2改性中的性能改善提供了有价值的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Catalytic effect of carbon-supported NiCoFeCuMg high-entropy alloy nanocatalysts on hydrogen storage properties of MgH2

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Catalytic effect of carbon-supported NiCoFeCuMg high-entropy alloy nanocatalysts on hydrogen storage properties of MgH2

High entropy alloy (HEA) based materials have been extensively investigated as viable catalysts in hydrogen storage for their unique properties. Herein, we demonstrate a relatively mild synthesis strategy for constructing carbon-supported by NiCoFeCuMg HEA (NiCoFeCuMg@C) nanocatalysts by utilizing polymetallic metal-organic frameworks (MOFs) as precursors. The incorporation of prepared catalysts into MgH₂ greatly improved the hydrogen storage performance: the MgH₂+NiCoFeCuMg@C composite can rapidly desorb 6.01 wt% H₂ at 325 °C, and the initial dehydrogenation temperature decreased to 167.2 °C, nearly 163.8 °C lower than that of the pure MgH₂. Besides, the composite exhibits a fairly stable reversible capacity with 97% capacity retention after 20 cycles. Most importantly, ex-situ structural characterization reveals that the synergistic effects of the “hydrogen pump” role of Mg₂Ni(Cu)/Mg₂Ni(Cu)H₄ and “hydrogen gateway” role of Co₃Fe₇, as well as the excellent dispersion function of carbon material, contribute to the outstanding hydrogen storage properties of the MgH₂+NiCoFeCuMg@C composite. This study provides valuable insights into the performance improvement of carbon-supported HEA catalysts in modification of MgH₂.

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来源期刊

Journal of Magnesium and Alloys Engineering-Mechanics of Materials

CiteScore

20.20

自引率

14.80%

发文量

审稿时长

59 days

期刊介绍： The Journal of Magnesium and Alloys serves as a global platform for both theoretical and experimental studies in magnesium science and engineering. It welcomes submissions investigating various scientific and engineering factors impacting the metallurgy, processing, microstructure, properties, and applications of magnesium and alloys. The journal covers all aspects of magnesium and alloy research, including raw materials, alloy casting, extrusion and deformation, corrosion and surface treatment, joining and machining, simulation and modeling, microstructure evolution and mechanical properties, new alloy development, magnesium-based composites, bio-materials and energy materials, applications, and recycling.