Enhanced hydrogen desorption kinetics and cycle durability of amorphous TiMgVNi3-doped MgH2
Enhanced hydrogen desorption kinetics and cycle durability of amorphous TiMgVNi3-doped MgH2
复制标题
增强非晶 TiMgVNi3 掺杂 MgH2 的氢解吸动力学和循环耐久性
DOI：
10.1016/j.ijhydene.2021.11.010
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发表时间：
2021-11
影响因子：
7.2
通讯作者：
Qingan Zhang
中科院分区：
文献类型：
--
作者：
Chaodong Hu;Zhiwen Zheng;Tingzhi Si;Qingan Zhang
MgH 2被认为是一种很有前途的车载储氢材料。为了改善MgH 2的储氢性能，采用氢气氛下球磨的方法制备了掺杂MgH 2的TiMgVNi 3非晶合金。结果表明，活化后原位生成了催化剂（Ti，V）H2和Mg 2NiH 4纳米颗粒。结果，非晶TiMgVNi 3掺杂的MgH 2表现出增强的脱氢动力学（脱氢活化能为94.4 kJ mol-1H 2）和上级的循环耐久性（50次循环后容量留存率高达92%）。这些结果表明，从非晶相原位形成高度分散的催化纳米颗粒是提高MgH 2储氢性能的有效途径。
MgH2is considered as a promising hydrogen storage material for on-board applications. In order to improve hydrogen storage properties of MgH2, the amorphous TiMgVNi3-doped MgH2is prepared by ball milling under hydrogen atmosphere. It is found that the catalytic (Ti,V)H2and Mg2NiH4nanoparticles are in situ formed after activation. As a result, the amorphous TiMgVNi3-doped MgH2exhibits enhanced dehydrogenation kinetics (the activation energy for hydrogen desorption is 94.4 kJ mol−1H2) and superior cycle durability (the capacity retention rate is up to 92% after 50 cycles). These results demonstrate that the in situ formation of highly dispersed catalytic nanoparticles from an amorphous phase is an effective pathway to enhance hydrogen storage properties of MgH2.
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