Abstract
Thin film alloys of PdBi have been synthesised using a high throughput physical vapour deposition method to produce compositional gradients of PdBi alloys. XPS indicates that for the non-equilibrated thin films, the surface composition is the same as the bulk, and core level shifts reflect the inter-metallic interaction between the component metals. Hydrogen absorption is hindered in the PdBi alloys, and at a composition of 70 at.% bismuth, the αBi2Pd bulk alloy phase is identified in XRD. This phase exhibits a maximum in the hydrogen evolution reaction (HER) and hydrogen oxidation reaction (HOR) electrocatalytic activity. The increased activity of the alloy can be understood in terms of the Pd d-band density of states, and a concomitant increase in the binding energy of hydrogen. There is a strong correlation between the HER and HOR activity as a function of composition across the complete range of alloys. The potential of using the αBi2Pd bulk inter-metallic phase at the anode of PEM fuel cells is briefly discussed.
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Acknowledgments
This work was supported by European Union funded project, FCANODE NMP3-CT-2007-032175. FAA acknowledges the government of Saudi Arabia for a PhD sponsorship.
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Al-Odail, F.A., Anastasopoulos, A. & Hayden, B.E. Hydrogen Evolution and Hydrogen Oxidation on Palladium Bismuth Alloys. Top Catal 54, 77–82 (2011). https://doi.org/10.1007/s11244-011-9650-9
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DOI: https://doi.org/10.1007/s11244-011-9650-9