Hydrogen evolution and hydrogen oxidation on palladium bismuth alloys
Hydrogen evolution and hydrogen oxidation on palladium bismuth alloys
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 ?Bi2Pd 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 ?Bi2Pd bulk inter-metallic phase at the anode of PEM fuel cells is briefly discussed.
electrocatalysis, alloys, hydrogen evolution reaction, hydrogen oxidation reaction, polymer electrolyte membrane fuel cells
77-82
Al-Odail, Faisal
c040c10b-97bd-4d9d-91a6-18e7db87b7a4
Anastasopoulos, Alexandros
7280a68f-3800-45a0-bbad-0e054707eb3b
Hayden, Brian
aea74f68-2264-4487-9d84-5b12ddbbb331
March 2011
Al-Odail, Faisal
c040c10b-97bd-4d9d-91a6-18e7db87b7a4
Anastasopoulos, Alexandros
7280a68f-3800-45a0-bbad-0e054707eb3b
Hayden, Brian
aea74f68-2264-4487-9d84-5b12ddbbb331
Al-Odail, Faisal, Anastasopoulos, Alexandros and Hayden, Brian
(2011)
Hydrogen evolution and hydrogen oxidation on palladium bismuth alloys.
Topics in Catalysis, 54 (1-4), .
(doi:10.1007/s11244-011-9650-9).
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 ?Bi2Pd 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 ?Bi2Pd bulk inter-metallic phase at the anode of PEM fuel cells is briefly discussed.
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Published date: March 2011
Keywords:
electrocatalysis, alloys, hydrogen evolution reaction, hydrogen oxidation reaction, polymer electrolyte membrane fuel cells
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Local EPrints ID: 178429
URI: http://eprints.soton.ac.uk/id/eprint/178429
ISSN: 1022-5528
PURE UUID: e940e03a-1a37-4bde-a205-eed8fdacf5ba
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Date deposited: 24 Mar 2011 15:32
Last modified: 15 Mar 2024 02:36
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Author:
Faisal Al-Odail
Author:
Alexandros Anastasopoulos
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