UM
Hydrogen generation by hydrolysis of Mg-Mg2Si composite and enhanced kinetics performance from introducing of MgCl2 and Si
Tan, Zhenhua; Ouyang, Liuzhang; Liu, Jiangwen; Wang, Hui; Shao, Huaiyu; Zhu, Min
2018-02
Source PublicationINTERNATIONAL JOURNAL OF HYDROGEN ENERGY
ISSN0360-3199
Volume43Issue:5Pages:2903-2912
AbstractThis 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.
KeywordHydrogen generation Magnesium chloride Mg-Mg2Si composite Hydrolysis
DOI10.1016/j.ijhydene.2017.12.163
URLView the original
Indexed BySCI
Language英语
WOS Research AreaChemistry ; Electrochemistry ; Energy & Fuels
WOS SubjectChemistry, Physical ; Electrochemistry ; Energy & Fuels
WOS IDWOS:000425563200034
PublisherPERGAMON-ELSEVIER SCIENCE LTD
The Source to ArticleWOS
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Cited Times [WOS]:28   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
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GB/T 7714
Tan, Zhenhua,Ouyang, Liuzhang,Liu, Jiangwen,et al. Hydrogen generation by hydrolysis of Mg-Mg2Si composite and enhanced kinetics performance from introducing of MgCl2 and Si[J]. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY,2018,43(5):2903-2912.
APA Tan, Zhenhua,Ouyang, Liuzhang,Liu, Jiangwen,Wang, Hui,Shao, Huaiyu,&Zhu, Min.(2018).Hydrogen generation by hydrolysis of Mg-Mg2Si composite and enhanced kinetics performance from introducing of MgCl2 and Si.INTERNATIONAL JOURNAL OF HYDROGEN ENERGY,43(5),2903-2912.
MLA Tan, Zhenhua,et al."Hydrogen generation by hydrolysis of Mg-Mg2Si composite and enhanced kinetics performance from introducing of MgCl2 and Si".INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 43.5(2018):2903-2912.
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