High-pressure phases induce H-vacancy diffusion kinetics in TM-doped MgH<inf>2</inf>: Ab initio study for hydrogen storage improvement

© 2019 Hydrogen Energy Publications LLC The improvement of the hydrogen storage mechanism in TM-doped MgH2 by structural high-pressure effects has been found using ab initio calculation. Phase transition, formation enthalpy and H-vacancy mechanism of α-, β-, and γ-MgH2 with 3.125% of Ni, Pd and Pd d...

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Main Authors: Prayoonsak Pluengphon, T. Bovornratanaraks, Prutthipong Tsuppayakorn-aek, Udomsilp Pinsook, Burapat Inceesungvorn
Format: Journal
Published: 2019
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http://cmuir.cmu.ac.th/jspui/handle/6653943832/65585
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spelling th-cmuir.6653943832-655852019-08-05T04:43:39Z High-pressure phases induce H-vacancy diffusion kinetics in TM-doped MgH<inf>2</inf>: Ab initio study for hydrogen storage improvement Prayoonsak Pluengphon T. Bovornratanaraks Prutthipong Tsuppayakorn-aek Udomsilp Pinsook Burapat Inceesungvorn Energy Physics and Astronomy © 2019 Hydrogen Energy Publications LLC The improvement of the hydrogen storage mechanism in TM-doped MgH2 by structural high-pressure effects has been found using ab initio calculation. Phase transition, formation enthalpy and H-vacancy mechanism of α-, β-, and γ-MgH2 with 3.125% of Ni, Pd and Pd dopants are analyzed under the pressure conditions of 0, 5 and 10 GPa. It is found that the enthalpy of β- and γ-phases based on the α-phase decreases in TM-doped systems, especially for the heavier atomic size of dopants (Pt > Pd > Ni). As a result, the γ-phase has become structural stable at ambient pressure. The occupation enthalpy of TM substitutions in β and γ phases is easier than that in the α phase, which indicates ability of mixing impurities. High pressure induces the occupation of H-vacancy in all compounds. The activation energy curves of MgH2 with Ni, Pd and Pt dopants are also analyzed, and the minimal barriers are significantly dominated in the γ phase. 2019-08-05T04:36:19Z 2019-08-05T04:36:19Z 2019-01-01 Journal 03603199 2-s2.0-85068206905 10.1016/j.ijhydene.2019.06.066 https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85068206905&origin=inward http://cmuir.cmu.ac.th/jspui/handle/6653943832/65585
institution Chiang Mai University
building Chiang Mai University Library
country Thailand
collection CMU Intellectual Repository
topic Energy
Physics and Astronomy
spellingShingle Energy
Physics and Astronomy
Prayoonsak Pluengphon
T. Bovornratanaraks
Prutthipong Tsuppayakorn-aek
Udomsilp Pinsook
Burapat Inceesungvorn
High-pressure phases induce H-vacancy diffusion kinetics in TM-doped MgH<inf>2</inf>: Ab initio study for hydrogen storage improvement
description © 2019 Hydrogen Energy Publications LLC The improvement of the hydrogen storage mechanism in TM-doped MgH2 by structural high-pressure effects has been found using ab initio calculation. Phase transition, formation enthalpy and H-vacancy mechanism of α-, β-, and γ-MgH2 with 3.125% of Ni, Pd and Pd dopants are analyzed under the pressure conditions of 0, 5 and 10 GPa. It is found that the enthalpy of β- and γ-phases based on the α-phase decreases in TM-doped systems, especially for the heavier atomic size of dopants (Pt > Pd > Ni). As a result, the γ-phase has become structural stable at ambient pressure. The occupation enthalpy of TM substitutions in β and γ phases is easier than that in the α phase, which indicates ability of mixing impurities. High pressure induces the occupation of H-vacancy in all compounds. The activation energy curves of MgH2 with Ni, Pd and Pt dopants are also analyzed, and the minimal barriers are significantly dominated in the γ phase.
format Journal
author Prayoonsak Pluengphon
T. Bovornratanaraks
Prutthipong Tsuppayakorn-aek
Udomsilp Pinsook
Burapat Inceesungvorn
author_facet Prayoonsak Pluengphon
T. Bovornratanaraks
Prutthipong Tsuppayakorn-aek
Udomsilp Pinsook
Burapat Inceesungvorn
author_sort Prayoonsak Pluengphon
title High-pressure phases induce H-vacancy diffusion kinetics in TM-doped MgH<inf>2</inf>: Ab initio study for hydrogen storage improvement
title_short High-pressure phases induce H-vacancy diffusion kinetics in TM-doped MgH<inf>2</inf>: Ab initio study for hydrogen storage improvement
title_full High-pressure phases induce H-vacancy diffusion kinetics in TM-doped MgH<inf>2</inf>: Ab initio study for hydrogen storage improvement
title_fullStr High-pressure phases induce H-vacancy diffusion kinetics in TM-doped MgH<inf>2</inf>: Ab initio study for hydrogen storage improvement
title_full_unstemmed High-pressure phases induce H-vacancy diffusion kinetics in TM-doped MgH<inf>2</inf>: Ab initio study for hydrogen storage improvement
title_sort high-pressure phases induce h-vacancy diffusion kinetics in tm-doped mgh<inf>2</inf>: ab initio study for hydrogen storage improvement
publishDate 2019
url https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85068206905&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/65585
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