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Co-Addition of Mg(2)Si and Graphene for Synergistically Improving the Hydrogen Storage Properties of Mg−Li Alloy

Mg−Li alloy possesses a high hydrogen capacity. However, the hydrogenation and dehydrogenation performances are still far from practical application. In this work, Mg(2)Si (MS) and graphene (G) were employed together to synergistically improve the hydrogen storage properties of Mg−Li alloy. The stru...

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Autores principales: Huang, Xiantun, Liu, Haizhen, Duan, Xingqing, Lan, Zhiqiang, Guo, Jin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8548883/
https://www.ncbi.nlm.nih.gov/pubmed/34722466
http://dx.doi.org/10.3389/fchem.2021.775537
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author Huang, Xiantun
Liu, Haizhen
Duan, Xingqing
Lan, Zhiqiang
Guo, Jin
author_facet Huang, Xiantun
Liu, Haizhen
Duan, Xingqing
Lan, Zhiqiang
Guo, Jin
author_sort Huang, Xiantun
collection PubMed
description Mg−Li alloy possesses a high hydrogen capacity. However, the hydrogenation and dehydrogenation performances are still far from practical application. In this work, Mg(2)Si (MS) and graphene (G) were employed together to synergistically improve the hydrogen storage properties of Mg−Li alloy. The structures of the samples were studied by XRD and SEM methods. The hydrogen storage performances of the samples were studied by nonisothermal and isothermal hydrogenation and dehydrogenation, thermal analysis, respectively. It is shown that the onset dehydrogenation temperature of Mg−Li alloy was synergistically reduced from 360°C to 310°C after co-addition of Mg(2)Si and graphene. At a constant temperature of 325°C, the Mg−Li−MS−G composite can release 2.7 wt.% of hydrogen within 2 h, while only 0.2 wt.% of hydrogen is released for the undoped Mg−Li alloy. The hydrogenation activation energy of the Mg−Li−MS−G composite was calculated to be 86.5 kJ mol(−1). Microstructure and hydrogen storage properties studies show that graphene can act as a grinding aid during the ball milling process, which leads to a smaller particle size for the composites. This work demonstrates that coaddition of Mg(2)Si and graphene can synergistically improve the hydrogen storage properties of Mg−Si alloy and offers an insight into the role of graphene in the Mg−Li−MS−G composite.
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spelling pubmed-85488832021-10-28 Co-Addition of Mg(2)Si and Graphene for Synergistically Improving the Hydrogen Storage Properties of Mg−Li Alloy Huang, Xiantun Liu, Haizhen Duan, Xingqing Lan, Zhiqiang Guo, Jin Front Chem Chemistry Mg−Li alloy possesses a high hydrogen capacity. However, the hydrogenation and dehydrogenation performances are still far from practical application. In this work, Mg(2)Si (MS) and graphene (G) were employed together to synergistically improve the hydrogen storage properties of Mg−Li alloy. The structures of the samples were studied by XRD and SEM methods. The hydrogen storage performances of the samples were studied by nonisothermal and isothermal hydrogenation and dehydrogenation, thermal analysis, respectively. It is shown that the onset dehydrogenation temperature of Mg−Li alloy was synergistically reduced from 360°C to 310°C after co-addition of Mg(2)Si and graphene. At a constant temperature of 325°C, the Mg−Li−MS−G composite can release 2.7 wt.% of hydrogen within 2 h, while only 0.2 wt.% of hydrogen is released for the undoped Mg−Li alloy. The hydrogenation activation energy of the Mg−Li−MS−G composite was calculated to be 86.5 kJ mol(−1). Microstructure and hydrogen storage properties studies show that graphene can act as a grinding aid during the ball milling process, which leads to a smaller particle size for the composites. This work demonstrates that coaddition of Mg(2)Si and graphene can synergistically improve the hydrogen storage properties of Mg−Si alloy and offers an insight into the role of graphene in the Mg−Li−MS−G composite. Frontiers Media S.A. 2021-10-13 /pmc/articles/PMC8548883/ /pubmed/34722466 http://dx.doi.org/10.3389/fchem.2021.775537 Text en Copyright © 2021 Huang, Liu, Duan, Lan and Guo. https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Chemistry
Huang, Xiantun
Liu, Haizhen
Duan, Xingqing
Lan, Zhiqiang
Guo, Jin
Co-Addition of Mg(2)Si and Graphene for Synergistically Improving the Hydrogen Storage Properties of Mg−Li Alloy
title Co-Addition of Mg(2)Si and Graphene for Synergistically Improving the Hydrogen Storage Properties of Mg−Li Alloy
title_full Co-Addition of Mg(2)Si and Graphene for Synergistically Improving the Hydrogen Storage Properties of Mg−Li Alloy
title_fullStr Co-Addition of Mg(2)Si and Graphene for Synergistically Improving the Hydrogen Storage Properties of Mg−Li Alloy
title_full_unstemmed Co-Addition of Mg(2)Si and Graphene for Synergistically Improving the Hydrogen Storage Properties of Mg−Li Alloy
title_short Co-Addition of Mg(2)Si and Graphene for Synergistically Improving the Hydrogen Storage Properties of Mg−Li Alloy
title_sort co-addition of mg(2)si and graphene for synergistically improving the hydrogen storage properties of mg−li alloy
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8548883/
https://www.ncbi.nlm.nih.gov/pubmed/34722466
http://dx.doi.org/10.3389/fchem.2021.775537
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