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Time-resolved detection of surface oxide formation at individual gold nanoparticles : role in electrocatalysis and new approach for sizing by electrochemical impacts
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Bentley, Cameron Luke, Kang, Minkyung and Unwin, Patrick R. (2016) Time-resolved detection of surface oxide formation at individual gold nanoparticles : role in electrocatalysis and new approach for sizing by electrochemical impacts. Journal of the American Chemical Society . doi:10.1021/jacs.6b08124 ISSN 0002-7863.
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Official URL: http://dx.doi.org/10.1021/jacs.6b08124
Abstract
Nanoparticle (NP) impacts on electrode surfaces has become an important method for analyzing the properties and activity of individual NPs, by either: (i) electrocatalytic reactions; or (ii) volumetric (dissolution) analyses. Using Au NPs as an exemplar system, this contribution shows that it is possible to detect surface oxide formation at individual NPs, which occurs on a rapid timescale (ca. 500 µs). The charge associated with this ‘surface oxidation method’ can be used for sizing (with results that are comparable to TEM) despite charges of only fC being measured. This platform further allows the role of surface oxides in electrocatalysis to be elucidated, with the timescale of oxide formation being controllable (i.e., ‘tunable’) through the applied potential, as illustrated through studies of borohydride and hydrazine electro-oxidation. Finally, all of these studies are carried out on an oxide-covered gold substrate, which can be prepared and regenerated straightforwardly on a gold electrode, through the applied potential.
Item Type: | Journal Article | ||||||
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Subjects: | Q Science > QD Chemistry | ||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||||
Library of Congress Subject Headings (LCSH): | Electrocatalysis, Nanoparticles | ||||||
Journal or Publication Title: | Journal of the American Chemical Society | ||||||
Publisher: | American Chemical Society | ||||||
ISSN: | 0002-7863 | ||||||
Official Date: | 9 September 2016 | ||||||
Dates: |
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DOI: | 10.1021/jacs.6b08124 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||
Date of first compliant deposit: | 15 September 2016 | ||||||
Date of first compliant Open Access: | 9 September 2017 | ||||||
Funder: | University of Warwick |
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