Hydrogen generation by hydrolysis of Mg-Mg2Si composite and enhanced kinetics performance from introducing of MgCl2 and Si

标题

Hydrogen generation by hydrolysis of Mg-Mg2Si composite and enhanced kinetics performance from introducing of MgCl2 and Si

作者

作者:Tan, ZH (Tan, Zhenhua)^[1 ]; Ouyang, LZ (Ouyang, Liuzhang)^[1,2 ]; Liu, JW (Liu, Jiangwen)^[1 ]; Wang, H (Wang, Hui)^[1 ]; Shao, HY (Shao, Huaiyu)^[3 ]; Zhu, M (Zhu, Min)^[1 ]

期刊信息

摘要

This paper reported the performance and mechanism of hydrogen generation via hydrolysis of ball-milled Mg-Mg2Si composite (5.3 wt % Si-94.7 wt % Mg) in deionized water and in MgCl2 solution. The results showed that the obtained Mg-Mg2Si composite presented relatively higher hydrogen generation performance than pure magnesium. Adoption of 0.5 M MgCl2 solution to replace deionized water sufficiently and vastly enhanced the hydrolysis properties of the Mg-Mg2Si composite. The composite in 0.5 M MgCl2 solution generated 445 mL/g hydrogen in 5 min, 688 mL/g hydrogen in 10 min and 889 mL/g hydrogen (conversion rate 99%) in 40 min at 328 K. This remarkable improvement is due to that the addition of Si element in the composite and the introduction of MgCl2 in solution, as well as the special preparation process of the materials, could decrease the formation of continuous magnesium hydroxide passive layer on the particle surface, directly or indirectly. Moreover, the apparent activation energies for composite hydrolysis in deionized water, in 0.5 and 2.0 M MgCl2 solution were calculated to be 30.1 +/- 0.6, 9.5 +/- 0.1 and 3.7 +/- 0.2 kJ/mol, respectively. This work demonstrates that the hydrogen generation system based on low-cost and high-performance Mg-Mg2Si composite is very applicable and promising; and it may open a new avenue for onsite hydrogen supply. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

关键词

作者关键词:Hydrogen generation; Magnesium chloride; Mg-Mg2Si composite; Hydrolysis

作者信息

作者信息

通讯作者地址:Ouyang, LZ (通讯作者)

South China Univ Technol, Guangdong Prov Key Lab Adv Energy Storage Mat, Sch Mat Sci & Engn, Guangzhou 510641, Guangdong, Peoples R China.   增强组织信息的名称     South China University of Technology

通讯作者地址:Shao, HY (通讯作者)

Univ Macau, IAPME, Taipa, Macao, Peoples R China.   增强组织信息的名称     University of Macau

地址:

	[ 1 ] South China Univ Technol, Guangdong Prov Key Lab Adv Energy Storage Mat, 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 ] Key Lab Fuel Cell Technol Guangdong Prov, China Australia Joint Lab Energy & Environm Mat, Guangzhou 510641, Guangdong, Peoples R China
	[ 3 ] Univ Macau, IAPME, Taipa, Macao, Peoples R China   增强组织信息的名称     University of Macau

电子邮件地址:meouyang@scut.edu.cn; hshao@umac.mo

出版商

PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND

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