NiCoFeCu medium-entropy alloy nanoparticles encapsulated in carbon nanotubes as catalysts for enhancing the hydrogen desorption of MgH2

IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Rare Metals Pub Date : 2024-08-01 DOI:10.1007/s12598-024-02936-x

Ya-Fei Liu, Yi-Ke Huang, Yu-Sang Guo, Meng-Yuan Yue, Hua-Xu Shao, Yi-Jing Wang

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Abstract

Recently, high/medium-entropy alloys (HEAs/MEAs) have been considered attractive catalysts due to their unique physicochemical properties. However, the synthesis of nano-sized HEAs/MEAs catalysts with desirable morphology presents significant challenges. Herein, we report the synthesis of NiCoFeCu MEA nanoparticles encapsulated in nitrogen-doped carbon nanotubes (NCTs) via a straightforward one-step pyrolysis method. The unique structure of NiCoFeCu/NCTs and the nano-sized MEA catalysts contributes to the improved hydrogen desorption kinetics of MgH₂. The onset dehydrogenation temperature of the MgH₂-NiCoFeCu/NCTs composite decreased to 173.4 °C, a reduction of 117.4 °C compared to pure MgH₂. The MgH₂-NiCoFeCu/NCTs composite could release 6.50 wt% H₂ within 30 min at 325 °C. Furthermore, an activation energy of 116.3 kJ·mol⁻¹ for the MgH₂-NiCoFeCu/NCTs composite has been obtained, much lower than pure milled MgH₂, demonstrating an enhanced hydrogen desorption kinetics. Moreover, the exceptional dispersion capability of the carbon material contributes to outstanding cyclic stability without any loss of capacity even after 10 cycles of de/hydrogenation at 300 °C.

Graphical Abstract

Abstract Image

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封装在碳纳米管中的镍钴铁铜中熵合金纳米粒子作为催化剂增强 MgH2 的氢解吸作用

最近，高/中熵合金（HEAs/MEAs）因其独特的物理化学特性而被认为是具有吸引力的催化剂。然而，合成具有理想形态的纳米级 HEAs/MEAs 催化剂面临着巨大挑战。在此，我们报告了通过简单的一步热解法合成掺氮碳纳米管 (NCT) 中封装的 NiCoFeCu MEA 纳米颗粒。NiCoFeCu/NCTs 的独特结构和纳米尺寸的 MEA 催化剂有助于改善 MgH2 的氢解吸动力学。MgH2-NiCoFeCu/NCTs 复合材料的起始脱氢温度降至 173.4 ℃，与纯 MgH2 相比降低了 117.4 ℃。MgH2-NiCoFeCu/NCTs 复合材料可在 325 °C 下的 30 分钟内释放出 6.50 wt% 的 H2。此外，MgH2-NiCoFeCu/NCTs 复合材料的活化能为 116.3 kJ-mol-1，远低于纯研磨 MgH2，这表明氢气解吸动力学得到了增强。此外，碳材料优异的分散能力还有助于获得出色的循环稳定性，即使在 300 °C 下进行 10 次脱氢/加氢循环后，容量也不会有任何损失。

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来源期刊

Rare Metals 工程技术-材料科学：综合

CiteScore

12.10

自引率

12.50%

发文量

2919

审稿时长

2.7 months

期刊介绍： Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.