Compositionally complex doping for low-V Ti-Cr-V hydrogen storage alloys

被引:17
作者
Zhu, Yongyang [1 ,2 ]
Li, Xubo [2 ]
Yang, Xu-Sheng [1 ]
Chen, Pengyun [2 ]
Tsui, Gary Chi-Pong [1 ]
Xu, Zheng-Long [1 ]
Tang, Renheng [2 ]
Xiao, Fangming [2 ]
Chan, Kangcheung [1 ]
机构
[1] Hong Kong Polytech Univ, Res Inst Adv Mfg, Dept Ind & Syst Engn, Kowloon, Hong Kong, Peoples R China
[2] Guangdong Acad Sci, Inst Resources Utilizat & Rare Earth Dev, State Key Lab Rare Met Separat & Comprehens Utiliz, Guangdong Prov Key Lab Rare Earth Dev & Applicat, Guangzhou 510650, Peoples R China
关键词
Hydrogen storage; Ti-Cr-V alloys; BCC phase; C14 Laves phase; SOLID-SOLUTION PHASE; HIGH ENTROPY ALLOYS; CRYSTAL-STRUCTURE; MN; FE; MICROSTRUCTURE; COST;
D O I
10.1016/j.cej.2023.146970
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Ti-V-based BCC solid solution alloys, represented by Ti-Cr-V alloys, are considered as promising hydrogen storage materials due to their high hydrogen storage capacity (over 4 wt%) at room temperature. However, the difficult activation, low effective hydrogen desorption capacities, poor P-C-T plateau characteristics, and high cost remain significant problems for their practical applications. Herein, we present a new compositionally complex (high-entropy) doping strategy which was used to successfully fabricate a low-cost "Laves phase related BCC solid solution", TiCrV0.7(Nb0.2Fe0.2Co0.2Ni0.2Mn0.2)0.2, that exhibits excellent activation performance and high effective hydrogen desorption capacity (C1atme : 2.21 wt%). The main BCC phase ensures high hydrogen storage capacity, while the minor secondary C14 phase plays a catalytic role and thus improves the hydrogen absorption kinetics. Furthermore, we confirmed that there is a synergistic effect of Nb, Fe, Co, Ni, and Mn elements in improving hydrogen storage performance. The dehydrogenation enthalpy Delta H of the heat-treated TiCrV0.7(Nb0.2Fe0.2Co0.2Ni0.2Mn0.2)0.2 is 37.5 kJ mol- 1, which is significantly lower than previously reported Ti-Cr-V based systems, revealing a significant tendency towards easier dehydrogenation with high-entropy doping. This work offers a new alloying method for improving the hydrogen storage performance of hydrogen storage alloys.
引用
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页数:10
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