Reversible De/hydriding Reactions between Two New Mg-In-Ni Compounds with Improved Thermodynamics and Kinetics

标题

Reversible De/hydriding Reactions between Two New Mg-In-Ni Compounds with Improved Thermodynamics and Kinetics

作者

作者:Lu, YS (Lu, Yanshan)^[1,2 ]; Wang, H (Wang, Hui)^[1,2 ]; Liu, JW (Liu, Jiangwen)^[1,2 ]; Ouyang, LZ (Ouyang, Liuzhang)^[1,2,4 ]; Zhu, LK (Zhu, Liangkui)^[3 ]; Zhang, DL (Zhang, Daliang)^[3 ]; Zhu, M (Zhu, Min)^[1,2,4 ]

期刊信息

摘要

Magnesium-based alloys show great potential for hydrogen storage because of their high capacity, excellent reversibility, and low cost. However, the sluggish hydrogen sorption kinetics and overhigh dehydrogenation temperature hinder their practical application. In this paper, we present the reversible de/hydriding reaction mechanism of two new Mg-In-Ni ternary intermetallic compounds, which shows improved thermodynamics and kinetics in comparison with pure Mg. These two new phases correspond to Mg2InNi and Mg14In3Ni3 stoichiometries, both with orthorhombic structure, as determined by combinational X-ray diffraction and electron diffraction tomography analysis. In the hydriding process, the Mg14In3Ni3 alloy decomposes into a mixture of MgH2 and Mg2InNi, which is fully reversible in the dehydrogenation with hydrogen storage capacity of 1.8 wt %. For the dehydriding of MgH, and Mg2InNi, a decrease of the reaction enthalpy (70.1 kJ moll H-2) is obtained compared with pure MgH2 (72.2 kJ mol(-1) H-2), and the dehydrogenation activation energy is decreased to 78.5 kJ marl from -460 kJ mol(-1) for pure MgH2. Comparatively, the alloy Mg90In5Ni5 containing the Mg14In3Ni3 phase has higher reversible hydrogen storage capacity of 3.3 wt %, and the minimum dehydrogenation temperature is reduced to 220 degrees C. This work demonstrates the potential of exploring new Mg-based interrnetallic compounds for hydrogen storage applications.

关键词

KeyWords Plus:HYDROGEN STORAGE PROPERTIES; SOLID-SOLUTION ALLOYS; MAGNESIUM HYDRIDE; ABSORPTION PROPERTIES; CATALYTIC MECHANISM; ENHANCED KINETICS; SORPTION KINETICS; SYSTEM; DESORPTION; DESTABILIZATION

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, Guangdong, 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, Guangdong, Peoples R China   增强组织信息的名称     South China University of Technology
	[ 2 ] S China Univ Technol, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510641, Guangdong, Peoples R China   增强组织信息的名称     South China University of Technology
	[ 3 ] Jilin Univ, State Key Lab Inorgan Synth & Preparat Chem, Changchun 130012, Peoples R China   增强组织信息的名称     Jilin University
	[ 4 ] S China Univ Technol, China Australia Joint Lab Energy & Environm Mat, Guangzhou 510641, Guangdong, Peoples R China   增强组织信息的名称     South China University of Technology

电子邮件地址:memzhu@scut.edu.cn

出版商

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

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