Support induced charge transfer effects on electrochemical characteristics of Pt nanoparticle electrocatalysts
Support induced charge transfer effects on electrochemical characteristics of Pt nanoparticle electrocatalysts
The electrokinetic properties of Pt nanoparticles supported on Carbon (Pt/C) and Boron Carbide- Graphite composite (Pt/BC) are compared over a wide potential range. The influence of the support on the electronic state of Pt was investigated via in-situ X-ray Absorption Spectroscopy. Pt d-band filling, determined from XANES white line analysis, was lower and nearly constant between 0.4 and 0.95 V vs. RHE for Pt/BC, indicating more positively charged particles in the double layer region and a delay in the onset of oxide formation by about 0.2 V compared to the Pt/C catalyst, which showed a marked increase in d-band vacancies above 0.8 V vs. RHE. Moreover, analysis of the XANES data indicated a lack of sub-surface oxygen for the Pt/BC catalyst compared to the Pt/C catalyst above 0.9 V vs. RHE. Additional anion adsorption on the Pt/BC in the double layer region, detected by CO displacement, was also confirmed by XANES analysis of the d-band occupancy. The H2 oxidation activities of electrodes with low catalyst loadings were assessed under high mass transport conditions using the floating electrode methodology. The metal-support interaction between the Pt and BC support improved the maximum hydrogen oxidation current density by 1.4 times when compared to Pt/C.
163-170
Jackson, Colleen
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Smith, Graham
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Markiewicz, Matthew
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Inwood, David
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Leach, Andrew, Stephen
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Whalley, Penny Susan
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Kucernak, Anthony R.
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Russell, Andrea E.
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Kramer, Denis
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Levecque, Pieter
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15 June 2018
Jackson, Colleen
f9495080-95ba-4324-8981-a97720505357
Smith, Graham
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Markiewicz, Matthew
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Inwood, David
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Leach, Andrew, Stephen
eb2fee87-ab58-4a28-9319-529de90d1708
Whalley, Penny Susan
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Kucernak, Anthony R.
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Russell, Andrea E.
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Kramer, Denis
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Levecque, Pieter
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Jackson, Colleen, Smith, Graham, Markiewicz, Matthew, Inwood, David, Leach, Andrew, Stephen, Whalley, Penny Susan, Kucernak, Anthony R., Russell, Andrea E., Kramer, Denis and Levecque, Pieter
(2018)
Support induced charge transfer effects on electrochemical characteristics of Pt nanoparticle electrocatalysts.
Journal of Electroanalytical Chemistry, 819, .
(doi:10.1016/j.jelechem.2017.10.010).
Abstract
The electrokinetic properties of Pt nanoparticles supported on Carbon (Pt/C) and Boron Carbide- Graphite composite (Pt/BC) are compared over a wide potential range. The influence of the support on the electronic state of Pt was investigated via in-situ X-ray Absorption Spectroscopy. Pt d-band filling, determined from XANES white line analysis, was lower and nearly constant between 0.4 and 0.95 V vs. RHE for Pt/BC, indicating more positively charged particles in the double layer region and a delay in the onset of oxide formation by about 0.2 V compared to the Pt/C catalyst, which showed a marked increase in d-band vacancies above 0.8 V vs. RHE. Moreover, analysis of the XANES data indicated a lack of sub-surface oxygen for the Pt/BC catalyst compared to the Pt/C catalyst above 0.9 V vs. RHE. Additional anion adsorption on the Pt/BC in the double layer region, detected by CO displacement, was also confirmed by XANES analysis of the d-band occupancy. The H2 oxidation activities of electrodes with low catalyst loadings were assessed under high mass transport conditions using the floating electrode methodology. The metal-support interaction between the Pt and BC support improved the maximum hydrogen oxidation current density by 1.4 times when compared to Pt/C.
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Accepted/In Press date: 3 May 2017
e-pub ahead of print date: 4 October 2017
Published date: 15 June 2018
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Local EPrints ID: 414944
URI: http://eprints.soton.ac.uk/id/eprint/414944
ISSN: 1572-6657
PURE UUID: cb4e1e27-1f63-4419-9d90-944e3a04760e
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Date deposited: 17 Oct 2017 16:30
Last modified: 16 Mar 2024 02:59
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Author:
Colleen Jackson
Author:
Graham Smith
Author:
Matthew Markiewicz
Author:
David Inwood
Author:
Andrew, Stephen Leach
Author:
Penny Susan Whalley
Author:
Anthony R. Kucernak
Author:
Pieter Levecque
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