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The reduction of hydrogen peroxide at an Au-coated nanotubular TiO2 array

The reduction of hydrogen peroxide at an Au-coated nanotubular TiO2 array
The reduction of hydrogen peroxide at an Au-coated nanotubular TiO2 array
An Au-coated TiO2 nanotubular array, in the vertically aligned form, was investigated as a highly porous nanostructured electrode for the electrochemical reduction of H2O2 in an acidic sulphate electrolyte at 295 K. The TiO2 nanotubular arrays were formed via a two-stage anodising then nanosized Au particles were sputter deposited onto the surface. The following aspects were studied: (a) the shape evolution of Au particles on the nanotubular array (via surface microstructural imaging), (b) the effect of different degrees of Au loading on the nanotubular array (via voltammetric analysis) and (c) the electrochemical response of an Au–TiO2 nanotubular array compared to a plain, 2-D Au foil. TheAu particles could be deposited as a thin 3-D coated layer or as nodular nanostructures on the array. The highly nanoporous structure of the Au–TiO2 electrode led to a large enhancement in the limiting current (enhancement factor up to 6.6) and charge density (enhancement factor up to 8.9) or peroxide reduction compared to a plain Au foil due to the architecture of the ordered, high surface area of the nanotubular array.
169-177
Low, C.T.J.
e993d0ca-2b64-424b-9535-20bc8b78415f
Ponce de Leon, Carlos
508a312e-75ff-4bcb-9151-dacc424d755c
Walsh, F.C.
309528e7-062e-439b-af40-9309bc91efb2
Low, C.T.J.
e993d0ca-2b64-424b-9535-20bc8b78415f
Ponce de Leon, Carlos
508a312e-75ff-4bcb-9151-dacc424d755c
Walsh, F.C.
309528e7-062e-439b-af40-9309bc91efb2

Low, C.T.J., Ponce de Leon, Carlos and Walsh, F.C. (2014) The reduction of hydrogen peroxide at an Au-coated nanotubular TiO2 array. Journal of Applied Electrochemistry, 44 (1), 169-177. (doi:10.1007/s10800-013-0623-5).

Record type: Article

Abstract

An Au-coated TiO2 nanotubular array, in the vertically aligned form, was investigated as a highly porous nanostructured electrode for the electrochemical reduction of H2O2 in an acidic sulphate electrolyte at 295 K. The TiO2 nanotubular arrays were formed via a two-stage anodising then nanosized Au particles were sputter deposited onto the surface. The following aspects were studied: (a) the shape evolution of Au particles on the nanotubular array (via surface microstructural imaging), (b) the effect of different degrees of Au loading on the nanotubular array (via voltammetric analysis) and (c) the electrochemical response of an Au–TiO2 nanotubular array compared to a plain, 2-D Au foil. TheAu particles could be deposited as a thin 3-D coated layer or as nodular nanostructures on the array. The highly nanoporous structure of the Au–TiO2 electrode led to a large enhancement in the limiting current (enhancement factor up to 6.6) and charge density (enhancement factor up to 8.9) or peroxide reduction compared to a plain Au foil due to the architecture of the ordered, high surface area of the nanotubular array.

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Published date: 1 January 2014
Organisations: Engineering Science Unit

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Local EPrints ID: 364891
URI: http://eprints.soton.ac.uk/id/eprint/364891
PURE UUID: edf58f63-1b1d-4674-8552-6359778dfc94
ORCID for Carlos Ponce de Leon: ORCID iD orcid.org/0000-0002-1907-5913

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Date deposited: 15 May 2014 16:08
Last modified: 15 Mar 2024 03:22

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Contributors

Author: C.T.J. Low
Author: F.C. Walsh

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