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A combinatorial approach to the study of particle size effects on supported electrocatalysts: oxygen reduction on gold

A combinatorial approach to the study of particle size effects on supported electrocatalysts: oxygen reduction on gold
A combinatorial approach to the study of particle size effects on supported electrocatalysts: oxygen reduction on gold
A novel high-throughput technique has been developed for the investigation of the influence of supported metal particle size and the support on electrocatalytic activity. Arrays with a gradation of catalyst particle sizes are fabricated in a physical vapor deposition system that also allows selection of the support material. Simultaneous electrochemical measurements at all electrodes in the array, together with determination of the actual particle size distribution on each of the electrodes by transmission electron microscopy (TEM), then allows rapid determination of the activity as a function of catalyst center size. The procedure is illustrated using data for the reduction of oxygen on gold nanoparticles supported on both substoichiometric titanium dioxide (TiOx) and carbon and the conclusions are verified using voltammetry at rotating disk electrodes. Gold centers with diameters in the range 1.4-6.3 nm were investigated and it is demonstrated that, with both supports, the catalytic activity for oxygen reduction decays rapidly for particle sizes below 3.0 nm. This may be observed as a decrease in current at constant potential or an increase in the overpotential for oxygen reduction.
optical screening method, boron-doped diamond, catalytic-activity, au nanoparticles, electrodes, discovery, water, orientation, parallel, crystal
1520-4766
679-686
Guerin, Samuel
e185e0c2-85c6-4d1c-a2cf-cd2f410d346f
Hayden, Brian E.
aea74f68-2264-4487-9d84-5b12ddbbb331
Pletcher, Derek
f22ebe69-b859-4a89-80b0-9e190e6f8f30
Rendall, Michael E.
8bfffe2e-4fa1-4326-9c04-636a849940bb
Suchsland, Jens-Peter
3251dda4-1257-44af-b894-846ef5298133
Guerin, Samuel
e185e0c2-85c6-4d1c-a2cf-cd2f410d346f
Hayden, Brian E.
aea74f68-2264-4487-9d84-5b12ddbbb331
Pletcher, Derek
f22ebe69-b859-4a89-80b0-9e190e6f8f30
Rendall, Michael E.
8bfffe2e-4fa1-4326-9c04-636a849940bb
Suchsland, Jens-Peter
3251dda4-1257-44af-b894-846ef5298133

Guerin, Samuel, Hayden, Brian E., Pletcher, Derek, Rendall, Michael E. and Suchsland, Jens-Peter (2006) A combinatorial approach to the study of particle size effects on supported electrocatalysts: oxygen reduction on gold. Journal of Combinatorial Chemistry, 8 (5), 679-686. (doi:10.1021/cc060041c).

Record type: Article

Abstract

A novel high-throughput technique has been developed for the investigation of the influence of supported metal particle size and the support on electrocatalytic activity. Arrays with a gradation of catalyst particle sizes are fabricated in a physical vapor deposition system that also allows selection of the support material. Simultaneous electrochemical measurements at all electrodes in the array, together with determination of the actual particle size distribution on each of the electrodes by transmission electron microscopy (TEM), then allows rapid determination of the activity as a function of catalyst center size. The procedure is illustrated using data for the reduction of oxygen on gold nanoparticles supported on both substoichiometric titanium dioxide (TiOx) and carbon and the conclusions are verified using voltammetry at rotating disk electrodes. Gold centers with diameters in the range 1.4-6.3 nm were investigated and it is demonstrated that, with both supports, the catalytic activity for oxygen reduction decays rapidly for particle sizes below 3.0 nm. This may be observed as a decrease in current at constant potential or an increase in the overpotential for oxygen reduction.

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More information

Published date: 2006
Keywords: optical screening method, boron-doped diamond, catalytic-activity, au nanoparticles, electrodes, discovery, water, orientation, parallel, crystal

Identifiers

Local EPrints ID: 44455
URI: http://eprints.soton.ac.uk/id/eprint/44455
ISSN: 1520-4766
PURE UUID: a2a42c8e-7405-4250-a891-c0944ab86ebf
ORCID for Brian E. Hayden: ORCID iD orcid.org/0000-0002-7762-1812

Catalogue record

Date deposited: 05 Mar 2007
Last modified: 17 Dec 2019 02:03

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