基于镍基固溶体催化的氢化镁储氢性能 |
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引用本文: | 张健,何柳,姚远,周小杰,蒋礼坤,彭平. 基于镍基固溶体催化的氢化镁储氢性能[J]. 中国有色金属学会会刊, 2022, 32(2): 604-617. DOI: 10.1016/S1003-6326(22)65819-9 |
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作者姓名: | 张健 何柳 姚远 周小杰 蒋礼坤 彭平 |
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摘 要: | 采用高能球磨制备Ni?25%X(X=Fe,Co,Cu,摩尔分数)固溶体,然后将其掺杂于MgH2体系中.与球磨纯MgH2相比,MgH2/Ni?25%X复合体系初始放氢温度降低近90℃,其中,Ni?25%Co固溶体呈最佳催化效果.球磨MgH2/Ni?25%Co复合体系在300℃、10 min内可释放5.19%(质量分数)氢...
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关 键 词: | MgH2 镍基固溶体 催化效果 储氢性能 第一性原理计算 |
收稿时间: | 2021-03-14 |
Hydrogen storage properties of magnesium hydride catalyzed by Ni-based solid solutions |
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Affiliation: | 1. Hunan Provincial Key Laboratory of Intelligent Manufacturing Technology for High-performance Mechanical Equipment, Changsha University of Science and Technology, Changsha 410114, China;2. Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, Changsha University of Science and Technology, Changsha 410114, China;3. College of Materials Science and Engineering, Hunan University, Changsha 410082, China |
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Abstract: | The Ni–25%X (X=Fe, Co, Cu, molar fraction) solid solutions were prepared and then doped into MgH2 through high-energy ball milling. The initial dehydrogenation temperatures of MgH2/Ni–25%X composites are all decreased by about 90 °C relative to the as-milled pristine MgH2. The Ni–25%Co solid solution exhibits the most excellent catalytic effect, and the milled MgH2/Ni–25%Co composite can release 5.19 wt.% hydrogen within 10 min at 300 °C, while the as-milled pristine MgH2 can only release 1.78 wt.% hydrogen. More importantly, the dehydrogenated MgH2/Ni–25%Co composite can absorb 5.39 wt.% hydrogen at 275 °C within 3 min. The superior hydrogen sorption kinetics of MgH2/Ni–25%Co can be ascribed to the actual catalytic effect of in-situ formed Mg2Ni(Co) compounds. First-principles calculations show that the hydrogen absorption/desorption energy barriers of Mg/MgH2 systems decrease significantly after doping with transition metal atoms, which interprets well the improved hydrogen sorption properties of MgH2 catalyzed by Ni-based solid solutions. |
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Keywords: | Ni-based solid solutions catalytic effect hydrogen storage properties first-principles calculations |
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