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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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 |
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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 |
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© 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. |
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Prayoonsak Pluengphon T. Bovornratanaraks Prutthipong Tsuppayakorn-aek Udomsilp Pinsook Burapat Inceesungvorn |
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Prayoonsak Pluengphon T. Bovornratanaraks Prutthipong Tsuppayakorn-aek Udomsilp Pinsook Burapat Inceesungvorn |
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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 |
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2019 |
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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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