【作者】 张秋雨； 胥亚楠； 臧磊； 王一菁； 焦丽芳； 袁华堂； 李菁；

【Author】 ZHANG Qiuyu;XU Yanan;ZANG Lei;WANG Yijing;JIAO Lifang;YUAN Huatang;LI Jing;College of Chemistry, Collaborative Innovation Center of Chemical Science and Engineering(Tianjin), Key Laboratory of Advanced Energy Materials Chemistry (MOE), Nankai University;

【机构】 南开大学化学学院天津化学化工协同创新中心先进能源材料教育部重点实验室；

【摘要】 <正>氢化镁是一种非常有前景的储氢材料,具有低成本、高容量、可逆性好等优点。针对其放氢温度高和动力学差的问题,本文采用水热法合成Ni₂P@GNS纳米催化剂并通过球磨法添加到对MgH₂中。MgH₂-Ni₂P@GNS复合体系的放氢性能有显著提高。研究表明,MgH₂-Ni₂P@GNS更多还原

【Abstract】 Magnesium hydride is considered as one of the most promising hydrogen storage materials because of its low cost, outstanding reversibility and high theoretical hydrogen storage capacity. However, the application of MgH₂ is restricted by high dehydrogenation temperature and sluggish sorption kinetics. We have employed hydrothermal technique to synthesize Ni2P@GNS and prepared the MgH₂-Ni₂P@GNS nanocomposite. The Ni₂P@GNS nanohybrids exhibit the enhanced catalytic effects on the dehydrogenation properties of MgH₂. The peak desorption temperature of MgH₂-Ni₂P/GNS composites can be lowered more than 78 ℃ than the pure as-milled MgH₂. And 6.1 wt% H₂ is released within 20 min at 325 ℃ for MgH₂-Ni₂P/GNS composite, in comparison with only 0.5 wt% H₂ for undoped MgH₂. Mg₂Ni 和 Mg₃P₂ generated in the dehydrogenation can prevent the nanoparticles growth and aggregation, and then the composite exhibit an enhanced kinetics and cycling performance.更多还原