Substitution effects on the hydrogen storage behavior of AB2 alloys by first principles
Fen LI , Ji-jun ZHAO , Li-xian SUN
Front. Phys. ›› 2011, Vol. 6 ›› Issue (2) : 214 -219.
The hydrogen storage behavior of the TiCr2 and ZrCr2 alloys substituted with the third components (Zr, V, Fe, Ni) have been studied using first-principles calculations. The change of the hydrogen absorption energies caused by metal doping is arising from the charge transfer among the doped alloys interior. Zr and V atoms devoted abundant electrons, leading to a great enhancement of the H absorption energy, while Fe and Ni atoms always accepted electrons, yielding a remarkable decrease of the H absorption energy. The hydrogen diffusion energy barrier is closely correlated with the geometry effect rather than the electronic structure.
alloy / hydrogen storage / doping / first-principles
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Higher Education Press and Springer-Verlag Berlin Heidelberg
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