The influence of support and particle size on the platinum catalysed oxygen reduction reaction
The influence of support and particle size on the platinum catalysed oxygen reduction reaction
A range of platinum deposits, equivalent thicknesses (?) 0.2–2.5 nm, have been synthesised on carbon and reduced titania (TiOx) supports using physical vapour deposition on (10 × 10) arrays of electrodes. For ? < 1.0 nm, discrete platinum centres are formed and the TiOx supported platinum show two distinct characteristics: (a) a strong positive shift in the potential for the oxidation of monolayers of CO with decreasing loading of Pt leading to an inability to oxidise the CO on the lowest loadings and (b) a strong negative shift in the potential for the reduction of oxygen.
Both observations can be understood in terms of an increase in the irreversibility of the Pt/PtO couple at such surfaces. The same trends, although significantly weaker, are seen with the carbon supported platinum, ? < 1.0 nm, and it is suggested that the Pt/PtO couple on carbon shows intermediate kinetics between Pt on TiOx and bulk Pt. These results have significant implications for understanding the mechanism of oxygen reduction on supported Pt catalysts and hence for the search for alternative supports to platinum for ORR electrocatalysts.
9141-9148
Hayden, Brian E.
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Pletcher, Derek
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Suchsland, Jens Peter
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Williams, Laura J.
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12 August 2009
Hayden, Brian E.
aea74f68-2264-4487-9d84-5b12ddbbb331
Pletcher, Derek
f22ebe69-b859-4a89-80b0-9e190e6f8f30
Suchsland, Jens Peter
b274e089-34e8-4d97-ae11-085e7c1490ef
Williams, Laura J.
98101e5d-f6cb-451c-81ae-06b1086e752e
Hayden, Brian E., Pletcher, Derek, Suchsland, Jens Peter and Williams, Laura J.
(2009)
The influence of support and particle size on the platinum catalysed oxygen reduction reaction.
Physical Chemistry Chemical Physics, 11 (40), .
(doi:10.1039/b910110a).
Abstract
A range of platinum deposits, equivalent thicknesses (?) 0.2–2.5 nm, have been synthesised on carbon and reduced titania (TiOx) supports using physical vapour deposition on (10 × 10) arrays of electrodes. For ? < 1.0 nm, discrete platinum centres are formed and the TiOx supported platinum show two distinct characteristics: (a) a strong positive shift in the potential for the oxidation of monolayers of CO with decreasing loading of Pt leading to an inability to oxidise the CO on the lowest loadings and (b) a strong negative shift in the potential for the reduction of oxygen.
Both observations can be understood in terms of an increase in the irreversibility of the Pt/PtO couple at such surfaces. The same trends, although significantly weaker, are seen with the carbon supported platinum, ? < 1.0 nm, and it is suggested that the Pt/PtO couple on carbon shows intermediate kinetics between Pt on TiOx and bulk Pt. These results have significant implications for understanding the mechanism of oxygen reduction on supported Pt catalysts and hence for the search for alternative supports to platinum for ORR electrocatalysts.
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Published date: 12 August 2009
Organisations:
Faculty of Natural and Environmental Sciences, Chemistry, Electrochemistry
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Local EPrints ID: 159675
URI: http://eprints.soton.ac.uk/id/eprint/159675
ISSN: 1463-9076
PURE UUID: a4b07afb-486e-490a-96e1-fdf2282c980c
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Date deposited: 05 Jul 2010 15:16
Last modified: 14 Mar 2024 02:33
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Author:
Jens Peter Suchsland
Author:
Laura J. Williams
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