Superior catalytic effect of facile synthesized LaNi4.5Mn0.5 submicroparticles on the hydrogen storage properties of MgH2
Superior catalytic effect of facile synthesized LaNi4.5Mn0.5 submicroparticles on the hydrogen storage properties of MgH2
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简易合成的LaNi4.5Mn0.5亚微米颗粒对MgH2储氢性能的优异催化作用
DOI：
10.1016/j.jallcom.2020.156069
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发表时间：
2020
影响因子：
6.2
通讯作者：
Zhu Xinqiao
中科院分区：
文献类型：
--
作者：
Zhang Liuting;Lu Xiong;Sun Ze;Yan Nianhua;Yu Haijie;Lu Zhiyu;Zhu Xinqiao
Catalytic doping is an important strategy for enhancing the hydrogen storage performance of magnesium hydride. Hence, LaNi4.5Mn0.5submicro-particles were successfully prepared via a facile wet chemical ball milling method. To further study the catalytic performance, various amount of as-received LaNi4.5Mn0.5were introduced to MgH2and the submicro-LaNi4.5Mn0.5showed best catalytic effect on MgH2. Specifically, experimental results showed that LaNi4.5Mn0.5submicro-particles modified MgH2started to release hydrogen at 175 °C, about 150 °C lower than that of additive-free MgH2. At 300 °C, the composite could desorb 6.6 wt% H2within 6 min. Moreover, the fully dehydrogenated sample could take up hydrogen at room temperature and 4.1 wt% H2was charged within 10 min at 150 °C. The apparent activation energy of MgH2for hydrogenation after doping submicro-LaNi4.5Mn0.5was greatly reduced from 72.50 ± 2.70 to 16.63 ± 1.40 kJ/mol. Furthermore, a hydrogen capacity of 6.1 wt% was maintained after 10 cycles. The synergetic effects between the in-situ formed Mg2Ni/Mg2NiH4, Mn and LaH3may contribute to the promoted hydrogen dissociation and diffusion along the Mg/MgH2interface, thus reducing the energy barrier and enhancing the hydrogen storage performance of MgH2.
