Abstract
Comprehensive understanding of the hydrogen gas interaction with metal nanoparticles is crucial for the development of multifunctional materials. The hydrogen absorption properties of well-dispersed Pd–Ir nanoalloys on a mesoporous carbon are reported here. The average size of nanoalloys depends on the composition and is comprised between 2.7 and 3.5 nm with decreasing Ir content. Structural analysis evidences a single phase FCC structure for all nanoparticles and a linear variation of the lattice parameter with composition confirming the formation of nanoalloys in this bulk-immiscible system. The hydrogen absorption properties can be tuned by the chemical composition: Pd-rich nanoparticles form hydride phases, whereas Ir-rich phases do not absorb hydrogen under ambient temperature and pressure conditions. The thermodynamic properties of hydride formation in Pd-rich phases are altered relative to the bulk counterparts. Moreover, the hydrogen absorption capacity in Pd-rich nanoalloys is larger as compared to bulk alloys. This might be explained by an important finite size effect that increases the hydrogen absorption capability of Pd–Ir alloys at nanoscale.
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Julie Bourgon is acknowledged for TEM measurements.
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This study was funded by the French National Research Agency (ANR) under GENESIS contract no 13-BS08-0004.
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The authors declare that they have no conflict of interest.
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Malouche, A., Oumellal, Y., Ghimbeu, C.M. et al. Exploring the hydrogen absorption into Pd–Ir nanoalloys supported on carbon. J Nanopart Res 19, 270 (2017). https://doi.org/10.1007/s11051-017-3978-4
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DOI: https://doi.org/10.1007/s11051-017-3978-4