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>Efficient Hydrogen Generation from Ammonia Borane over Ru-Fe/porous CeO2 Induced by Intrinsic Charge State and Self-organized Microstructure
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Efficient Hydrogen Generation from Ammonia Borane over Ru-Fe/porous CeO2 Induced by Intrinsic Charge State and Self-organized Microstructure
In recent years, chemical hydrogen storage systems utilizing compounds with a high hydrogen capacity have attracted significant attention. In the present study, Ru–Fe supported on porous CeO_(2) was prepared for application in hydrogen generation systems using ammonia borane. The catalytic activity of the material for partial oxidation was elucidated. Specifically, the oxidation pathway was evaluated by thermodynamic calculations using the Ru–Fe–O ternary phase diagram. It was determined that the Ru–Fe alloy exhibited enhanced catalytic activity compared to pure Ru particles. In the alloy, the Ru component was self-organized, forming nailed particles in the oxidation films during preferential oxidation of Fe. The exposed nailed Ru particles prevented self-aggregation and coarsening, which was proposed as one of the reasons for the excellent catalytic activity. Moreover, it was speculated that in the exposed Ru–Fe alloy matrices, the density of states in the vicinity of the Fermi level was high due to the charge transfer from Fe to Ru. This meant that the number of molecular levels contributing to the catalytic reaction increased. It was concluded that a synergistic effect of the intrinsic charge state of the Ru–Fe alloy and the self-organized Ru assembly in the oxidation film resulted in remarkable catalytic activity.
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