Improvement in the hydrogenation-dehydrogenation performance of a Mg-Al alloy by graphene supported Ni
Improvement in the hydrogenation-dehydrogenation performance of a Mg-Al alloy by graphene supported Ni
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石墨烯负载Ni改善Mg-Al合金的加氢-脱氢性能
DOI：
10.1016/j.ijhydene.2019.10.242
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发表时间：
2020
影响因子：
7.2
通讯作者：
Zhou S. X.
中科院分区：
文献类型：
--
作者：
Huang H. X.;Yuan J. G.;Zhang B.;Zhang J. G.;Zhu Y. F.;Li L. Q.;Wu Y.;Zhou S. X.
镁基材料是非常有前途的储氢材料。本文采用氢化合成法（HS）和机械球磨法（MM）将石墨烯负载Ni引入到Mg 90 Al 10体系中。采用简单的化学还原法合成了80wt%Ni@Gn催化剂。催化剂和复合材料的微观结构表明，Ni纳米粒子在石墨烯表面得到了很好的负载，并均匀地分散在MgH 2颗粒表面。在加热至450 °C并随后在2.0 MPa氢气压力下在340 °C下保持2 h后，所有样品几乎完全氢化。程序升温脱附实验表明，Mg 90 Al 10 -8（80wt%Ni@Gn）复合材料可脱附5.85wt%H2，达到理论储氢量的96%。在523 K下，400 s内吸氢量为5.11 wt%，在573 K下，1800 s内放氢量为5.81 wt%。
Mg-based materials are very promising candidates for hydrogen storage. In this paper, the graphene supported Ni was introduced to the Mg90Al10system by hydrogenation synthesis (HS) and mechanical milling (MM). The 80 wt%Ni@Gn catalyst was synthesized by a facile chemical reduction method. The microstructures of the catalyst and composite show that Ni nanoparticles are well supported on the surface of graphene and they are dispersed uniformly on the surface of MgH2particles. After heating to 450 °C and holding at 340 °C for 2 h subsequently under 2.0 MPa hydrogen pressure, all the samples are almost completely hydrogenated. According to the temperature programmed desorption test, the Mg90Al10-8(80 wt%Ni@Gn) composite could desorb 5.85 wt% H2which comes up to 96% of the theoretical hydrogen storage capacity. Moreover, it shows the optimal hydriding/dehydriding performance, absorbing 5.11 wt% hydrogen within 400 s at 523 K, and desorbing 5.81 wt% hydrogen within 1800 s at 573 K.