CO oxidation on gold in acidic environments: particle size and substrate effects
CO oxidation on gold in acidic environments: particle size and substrate effects
The electrooxidation of carbon monoxide on titania- and carbon-supported gold nanoparticles of mean diameters <6.5 nm was studied in 0.5 M HClO4. The samples were prepared by physical vapor deposition, and the activity of the supported particles compared with the reaction at bulk, polycrystalline gold. Carbon-supported gold exhibited activity for CO oxidation only at potentials similar to that observed for bulk gold. Decreasing the particle size below ~2.5 nm resulted in a sharp decay in catalytic activity. Titania-supported gold exhibited catalytic activity at overpotentials significantly below those of bulk gold, and the activity was strongly particle-size-dependent. A maximum in activity was observed at ~3.0 nm, and a sharp reduction in activity is observed below ~2.5 nm. The results highlight two important effects. Titania is responsible for a strong substrate-induced activity for CO electrooxidation on gold particles. In addition to the induced activity at low overpotentials, this titania-supported gold is also shown to exhibit activity at high potentials where normally the oxidation of the gold poisons the reaction. The second observation is that the oxidation is inhibited on particles below 2.5 nm in size, irrespective of the support.
electronic-properties, nanoparticles, behavior, electrocatalytic, monolayer oxidation, catalytic-activity, carbon-monoxide, surface electrochemistry, electrochemical oxidation, supported gold, combinatorial approach, au
17044-17051
Hayden, B.E.
aea74f68-2264-4487-9d84-5b12ddbbb331
Pletcher, D.
f22ebe69-b859-4a89-80b0-9e190e6f8f30
Rendall, M.E.J.P.
a549849b-2850-44ae-be9a-ba8dc6ba0a14
2007
Hayden, B.E.
aea74f68-2264-4487-9d84-5b12ddbbb331
Pletcher, D.
f22ebe69-b859-4a89-80b0-9e190e6f8f30
Rendall, M.E.J.P.
a549849b-2850-44ae-be9a-ba8dc6ba0a14
Hayden, B.E., Pletcher, D. and Rendall, M.E.J.P.
(2007)
CO oxidation on gold in acidic environments: particle size and substrate effects.
The Journal of Physical Chemistry C, 111 (45), .
(doi:10.1021/jp074651u).
Abstract
The electrooxidation of carbon monoxide on titania- and carbon-supported gold nanoparticles of mean diameters <6.5 nm was studied in 0.5 M HClO4. The samples were prepared by physical vapor deposition, and the activity of the supported particles compared with the reaction at bulk, polycrystalline gold. Carbon-supported gold exhibited activity for CO oxidation only at potentials similar to that observed for bulk gold. Decreasing the particle size below ~2.5 nm resulted in a sharp decay in catalytic activity. Titania-supported gold exhibited catalytic activity at overpotentials significantly below those of bulk gold, and the activity was strongly particle-size-dependent. A maximum in activity was observed at ~3.0 nm, and a sharp reduction in activity is observed below ~2.5 nm. The results highlight two important effects. Titania is responsible for a strong substrate-induced activity for CO electrooxidation on gold particles. In addition to the induced activity at low overpotentials, this titania-supported gold is also shown to exhibit activity at high potentials where normally the oxidation of the gold poisons the reaction. The second observation is that the oxidation is inhibited on particles below 2.5 nm in size, irrespective of the support.
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Published date: 2007
Keywords:
electronic-properties, nanoparticles, behavior, electrocatalytic, monolayer oxidation, catalytic-activity, carbon-monoxide, surface electrochemistry, electrochemical oxidation, supported gold, combinatorial approach, au
Identifiers
Local EPrints ID: 54310
URI: http://eprints.soton.ac.uk/id/eprint/54310
ISSN: 1932-7447
PURE UUID: 7473453f-1790-49d7-8033-e0b8d2ae3dfe
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Date deposited: 31 Jul 2008
Last modified: 16 Mar 2024 02:36
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Author:
M.E.J.P. Rendall
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