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Support induced charge transfer effects on electrochemical characteristics of Pt nanoparticle electrocatalysts

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.
1572-6657
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
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
1faae37a-fab7-4edd-99ee-ae4c30d3cde4
Levecque, Pieter
eb987b8a-69a3-49d5-98b8-532d4c7d7a19
Jackson, Colleen
f9495080-95ba-4324-8981-a97720505357
Smith, Graham
fc86dfd8-e3c1-4888-acb0-4c9629b8c191
Markiewicz, Matthew
1d9784a1-37f4-47a5-a87c-09094c666776
Inwood, David
5364f809-b866-45aa-8b43-3db6113fb0e6
Leach, Andrew, Stephen
eb2fee87-ab58-4a28-9319-529de90d1708
Whalley, Penny Susan
48d33bda-010d-4c81-a1a1-fb88a6cb47cc
Kucernak, Anthony R.
3a0f1914-9ef6-40dc-87df-38aba7e4ceaf
Russell, Andrea E.
b6b7c748-efc1-4d5d-8a7a-8e4b69396169
Kramer, Denis
1faae37a-fab7-4edd-99ee-ae4c30d3cde4
Levecque, Pieter
eb987b8a-69a3-49d5-98b8-532d4c7d7a19

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, 163-170. (doi:10.1016/j.jelechem.2017.10.010).

Record type: Article

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

Identifiers

Local EPrints ID: 414944
URI: http://eprints.soton.ac.uk/id/eprint/414944
ISSN: 1572-6657
PURE UUID: cb4e1e27-1f63-4419-9d90-944e3a04760e
ORCID for Andrea E. Russell: ORCID iD orcid.org/0000-0002-8382-6443

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Date deposited: 17 Oct 2017 16:30
Last modified: 15 Sep 2021 01:42

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Contributors

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: Denis Kramer
Author: Pieter Levecque

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