期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 44, 期 21, 页码 10777-10787出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2019.02.218
关键词
Nano-dispersion; Bimetallic Pd-Ni particles; Hydrogen storage; Magnesium hydride
资金
- Jiangsu Key Laboratory for Advanced Metallic Materials [BM2007204]
- Six Talent Peaks Project in Jiangsu Province [2015-XNY-002]
- Fundamental Research Funds for the Central Universities [3212008101]
- Open Fund of the Guangdong Provincial Key Laboratory of Advance Energy Storage Materials [AESM201701]
Bimetallic Pd-Ni nano-particles supported by a mesoporous carbon material CMK-3 (denoted as Pd30Ni70/CMK-3) were synthesized through solution impregnation and hydrogen reduction methods. Among those hierarchical Ni-Pd nano-particles, majorly large ones (>10 nm) are dispersed over the surface of CMK-3, while a litter small ones (<10 nm) are embedded into the pores. It significantly improves the de/re-hydrogenation performances of MgH2 at low temperature. The onset desorption temperature of MgH2-Pd30Ni70/CMK-3 is lowered by 150 K from that of pristine MgH2 (above 593 K). About 6 wt% hydrogen could be released during its decomposition below 561 K. Noticeably, MgH2-Pd30Ni70/CMK-3 is capable of releasing 1.3 wt% H-2 even at 373 K. 4 wt% hydrogen can be absorbed at 343 K under a hydrogen pressure of 3 MPa within 18000 s. Activation energy values of both hydrogen decomposition (65.9 kJ mol(-1)) and absorption (78.9 kJ mol(-1)) for MgH2-Pd30Ni70/CMK-3 are greatly improved from those of as-milled MgH2. Thermal stability of the composite system is remarkably destabilized by 4.3 kJ mol H-2(-1) from pristine MgH2 according to pressure-composition isotherm curves and van't Hoff plots. The enhanced performances can be ascribed to the synergistic effects of both destabilization and catalysis from nano-dispersed Pd and Ni particles, respectively. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据