Enhanced Hydrogen Storage Kinetics and Stability by Synergistic Effects of in Situ Formed CeH2.73 and Ni in CeH2.73-MgH2-Ni Nanocomposites

标题

Enhanced Hydrogen Storage Kinetics and Stability by Synergistic Effects of in Situ Formed CeH2.73 and Ni in CeH2.73-MgH2-Ni Nanocomposites

作者

作者:Ouyang, LZ (Ouyang, L. Z.)^[1,6 ]; Yang, XS (Yang, X. S.)^[1 ]; Zhu, M (Zhu, M.)^[1,7 ]; Liu, JW (Liu, J. W.)^[1,6 ]; Dong, HW (Dong, H. W.)^[1 ]; Sun, DL (Sun, D. L.)^[2 ]; Zou, J (Zou, J.)^[3,4 ]; Yao, XD (Yao, X. D.)^[5,7 ]

期刊信息

摘要

Mg-based materials are promising candidates for high capacity hydrogen storage. However, their poor hydrogenation/dehydrogenation kinetics and high desorption temperature are the main obstacles to their applications. This paper reports a method for in situ formation of cycle stable CeH2.73-MgH2-Ni nanocomposites, from the hydrogenation of as-melt Mg80Ce18Ni2 alloy, with excellent hydrogen storage performance. The nanocomposites demonstrate reversible hydrogen storage capacity of more than 4.0 wt %, at a low desorption temperature with fast kinetics and long cycle life. The temperature for the full hydrogenation/dehydrogenation cycle of the composites is significantly decreased to 505 K, which is about 100 K lower than that for pure Mg. The hydrogen desorption activation energy is 63 +/- 3 kJ/mol H-2 for the composites, which is significantly lower than those of Mg3Ce alloy and pure Mg (104 +/- 7 and 158 +/- 2 kJ/mol H-2, respectively). X-ray diffraction and transmission electron microscopy have been used to reveal the mechanism that delivers this excellent cycle stability and fast hydriding/dehydriding kinetics. It is found that the hydriding/dehydriding process is catalyzed by the combination of in situ formed extremely fine CeH2/CeH2.73 and Ni to Mg/MgH2. In addition, this nanocomposite structure can effectively suppress Mg/MgH2 grain growth and enable the material to maintain its high performance for more than 500 hydrogenation dehydrogenation cycles.

关键词

KeyWords Plus:X-RAY-DIFFRACTION; MAGNESIUM HYDRIDE; ABSORPTION PROPERTIES; SORPTION KINETICS; CRYSTAL-STRUCTURE; MG; DESORPTION; COMPOSITES; MICROSTRUCTURE; SYSTEM

作者信息

作者信息

通讯作者地址:Zhu, M (通讯作者)

S China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510641, Peoples R China.   增强组织信息的名称     South China University of Technology

地址:

	[ 1 ] S China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510641, Peoples R China   增强组织信息的名称     South China University of Technology
	[ 2 ] Fudan Univ, Dept Mat Sci, Shanghai 200433, Peoples R China   增强组织信息的名称     Fudan University
	[ 3 ] Univ Queensland, St Lucia, Qld 4072, Australia   增强组织信息的名称     University of Queensland
	[ 4 ] Univ Queensland, Ctr Microscopy & Microanal, St Lucia, Qld 4072, Australia   增强组织信息的名称     University of Queensland
	[ 5 ] Griffith Univ, Sch Biomol & Phys Sci, Nathan, Qld 4111, Australia   增强组织信息的名称     Griffith University
	[ 6 ] S China Univ Technol, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510641, Peoples R China   增强组织信息的名称     South China University of Technology
	[ 7 ] Griffith Univ, Australia China Joint Lab Energy & Environm Mat, Nathan, Qld 4111, Australia

电子邮件地址:memzhu@scut.edu.cn; x.yao@griffith.edu.au

出版商

AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA

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