Mechanism and microstructural evolution of TiCrVFe hydrogen storage alloys upon de-/hydrogenation

doi:10.1016/j.jallcom.2021.160315

	Mechanism and microstructural evolution of TiCrVFe hydrogen storage alloys upon de-/hydrogenation
	Hu, Huazhou 1,2; Ma, Chuanming 2; Chen, Qingjun 1,2,3
刊名	JOURNAL OF ALLOYS AND COMPOUNDS
	2021-10-05
卷号	877 页码:10
关键词	Hydrogen storage materials TiCrVFe alloy Kinetics Thermodynamics Microstructure
ISSN号	0925-8388
DOI	10.1016/j.jallcom.2021.160315
英文摘要	TiCrVFe alloys have attracted significant attention because of their fast de-/hydrogenation rates and high reversible hydrogen capacities at moderate temperatures, but few studies have reported their de-/hydrogenation kinetics and thermodynamics. In this work, TiCrVFe alloys with different Ti/Cr ratios were prepared by arc melting, and their microstructural evolution and de-/hydrogenation mechanisms were investigated. XRD analysis confirmed that the crystal structure of TiCrVFe alloy transformed from BCC to FCC after hydrogenation, with lattice constants increasing from 3.0327 angstrom to 4.2714 angstrom. Combined the XRD with SEM-EDS analysis of the alloy after de-/hydrogenation tests, the hydrogenation expansion destroyed partial crystal lattice of the alloy and resulted in the generation of numerous defects and dislocations. This explains the slight fading of the cyclic capacity after several cycles. It was found that the hydrogen absorption kinetics of TiCrVFe alloys were controlled by 3D diffusion mechanisms, with an activation energy of -18.41 kJ/mol in the temperature range of 3-65 degrees C. The enthalpy change of the alloy (Ti27Cr27V40Fe6) was determined to be 45.68 kJ/mol upon hydrogenation and 51.33 kJ/mol upon dehydrogenation by the PCT curves and Van't Hoff equation. The enthalpy change of the Ti27Cr27V40Fe6 hydride upon dehydrogenation was consistent with the heat change in its DSC result. The results obtained in this work are useful for the application of TiCrVFe alloys as H-2 storage materials in fuel cell vehicles or devices. (C) 2021 Elsevier B.V. All rights reserved.
资助项目	Innovation Academy for Green Manufacture, Chinese Academy of Sciences[IAGM2020DB08] ; National Natural Science Foundation of China[92061125] ; National Key Projects for Fundamental Research and Development of China[2021YFF0306103] ; Beijing Natural Science Foundation[2202052] ; Beijing Natural Science Foundation[Z200012]
WOS关键词	CR ; PRESSURE ; CAPACITY ; FE ; KINETICS
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000660441400002
资助机构	Innovation Academy for Green Manufacture, Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Key Projects for Fundamental Research and Development of China ; Beijing Natural Science Foundation
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/49190]
专题	中国科学院过程工程研究所
通讯作者	Chen, Qingjun
作者单位	1.Jiangxi Univ Sci & Technol, Fac Mat Met & Chem, Ganzhou 341000, Peoples R China 2.Chinese Acad Sci, Ganjiang Innovat Acad, Ganzhou 341000, Peoples R China 3.Chinese Acad Sci, Innovat Acad Green Manufacture, Inst Proc Engn, Beijing Key Lab Ion Liquids Clean Proc,CAS Key La, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Hu, Huazhou,Ma, Chuanming,Chen, Qingjun. Mechanism and microstructural evolution of TiCrVFe hydrogen storage alloys upon de-/hydrogenation[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2021,877:10.
APA	Hu, Huazhou,Ma, Chuanming,&Chen, Qingjun.(2021).Mechanism and microstructural evolution of TiCrVFe hydrogen storage alloys upon de-/hydrogenation.JOURNAL OF ALLOYS AND COMPOUNDS,877,10.
MLA	Hu, Huazhou,et al."Mechanism and microstructural evolution of TiCrVFe hydrogen storage alloys upon de-/hydrogenation".JOURNAL OF ALLOYS AND COMPOUNDS 877(2021):10.