Enhancing hydrogen storage properties of MgH2 by core-shell CoNi@C
Enhancing hydrogen storage properties of MgH2 by core-shell CoNi@C
复制标题
核壳CoNi@C增强MgH2储氢性能
DOI：
10.1016/j.jallcom.2020.158004
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发表时间：
2021-03-02
影响因子：
6.2
通讯作者：
Li, Liquan
中科院分区：
文献类型：
--
作者：
Zhao, Yingyan;Zhu, Yunfeng;Li, Liquan
多组分纳米粒子的引入可显著改善MgH 2的脱氢/加氢动力学性能。本工作采用水热法和煅烧还原法合成了具有核壳结构的CoNi@C纳米粒子。MgH 2 - 8wt%CoNi@C在173 ℃开始分解，275 ℃下1800 s内的脱氢量为5.83wt%。此外，该复合材料在100 ℃下在1800 s内吸收4.83 wt%的H-2，在低温下具有突出的优势。MgH 2储氢性能的显著提高归因于Mg 2Co/Mg 2CoH 5和Mg 2Ni/Mg 2NiH 4的可逆相变以及碳壳的良好导热性和约束效应。脱氢反应的表观活化能降低到78.5kJ/mol。本工作拓展了具有特殊微观结构的纳米储氢材料的应用范围，提高了金属纳米储氢材料的储氢性能。(C)2020爱思唯尔B. V.保留所有权利。
Introducing multicomponent nanoparticles can improve remarkably de/hydrogenation kinetic properties of MgH2. In this work, the original core-shell CoNi@C bimetallic nanoparticles were obtained via hydrothermal and calcination reduction technology. MgH2-8 wt% CoNi@C starts to dehydrogenate at 173 degrees C with the dehydrogenation capacity of 5.83 wt% within 1800 s at 275 degrees C. Moreover, the composite absorbs 4.83 wt% H-2 within 1800 s at 100 degrees C with prominent advantage at low temperature. The notable improvement of hydrogen storage properties of MgH2 is attributed to the reversible phase transitions of Mg2Co/Mg2CoH5 and Mg2Ni/Mg2NiH4, and the excellent thermal conductivity and confinement effect of the carbon shell. As a result, the apparent activation energy of dehydrogenation reaction reduces to 78.5 kJ/mol. This work extends the horizon of bimetallic nanoparticles with especial microstructure for enhancing the hydrogen storage properties of metal hydrides. (C) 2020 Elsevier B.V. All rights reserved.