Pair distribution function and density functional theory analyses of hydrogen trapping by γ-MnO2
Kévin Galliez1, Philippe Deniard, Christophe Payen
1Institut des Matériaux Jean Rouxel (IMN), CNRS, Université de Nantes , 2 rue de la Houssinière, BP 32229, 44322 Nantes Cedex 03, France.
Abstract:
In the presence of "Ag2O" as a promoter, γ-MnO2 traps dihydrogen in its (2 × 1) and (1 × 1) tunnels. The course of this reaction was examined by analyzing the X-ray diffraction patterns of the HxMnO2/"Ag2O" system (0 ≤ x < 1) on the basis of pair distribution function and density functional theory (DFT) analyses. Hydrogen trapping occurs preferentially in the (2 × 1) tunnels of γ-MnO2, which is then followed by that in the (1 × 1) tunnels. Our DFT analysis shows that this process is thermodynamically favorable.
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