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Contribution of the double layer to transient faradaic processes: implications for hydrodynamic modulated voltammetry of nanostructures

Contribution of the double layer to transient faradaic processes: implications for hydrodynamic modulated voltammetry of nanostructures
Contribution of the double layer to transient faradaic processes: implications for hydrodynamic modulated voltammetry of nanostructures
The electrochemistry of Pt nanostructured electrodes is investigated using hydrodynamic modulated voltammetry (HMV). Here a liquid crystal templating process is used to produce platinum-modified electrodes with a range of surface areas (roughness factor 42.4?280.8). The electroreduction of molecular oxygen at these nanostructured platinum surfaces is used to demonstrate the ability of HMV to discriminate between faradaic and nonfaradaic electrode reactions. The HMV approach shows that the reduction of molecular oxygen experiences considerable signal loss within the high pseudocapacitive region of the voltammetry. Evidence for the contribution of the double layer to transient mass transfer events is presented. In addition, a model circuit and appropriate theoretical analysis are used to illustrate the transient responses of a time variant faradaic component. This in conjunction with the experimental evidence shows that, far from being a passive component in this system, the double layer can contribute to HMV faradaic reactions under certain conditions.
1932-7447
13442-13450
Kuleshova, Jekaterina
95594d04-c0e8-4a1f-b5cf-b3f90b314dd6
Birkin, Peter R.
ba466560-f27c-418d-89fc-67ea4f81d0a7
Elliott, Joanne M.
68967f54-82e0-4d8e-bc09-dc4522d18b2c
Kuleshova, Jekaterina
95594d04-c0e8-4a1f-b5cf-b3f90b314dd6
Birkin, Peter R.
ba466560-f27c-418d-89fc-67ea4f81d0a7
Elliott, Joanne M.
68967f54-82e0-4d8e-bc09-dc4522d18b2c

Kuleshova, Jekaterina, Birkin, Peter R. and Elliott, Joanne M. (2010) Contribution of the double layer to transient faradaic processes: implications for hydrodynamic modulated voltammetry of nanostructures. The Journal of Physical Chemistry C, 114 (32), 13442-13450. (doi:10.1021/jp102308p).

Record type: Article

Abstract

The electrochemistry of Pt nanostructured electrodes is investigated using hydrodynamic modulated voltammetry (HMV). Here a liquid crystal templating process is used to produce platinum-modified electrodes with a range of surface areas (roughness factor 42.4?280.8). The electroreduction of molecular oxygen at these nanostructured platinum surfaces is used to demonstrate the ability of HMV to discriminate between faradaic and nonfaradaic electrode reactions. The HMV approach shows that the reduction of molecular oxygen experiences considerable signal loss within the high pseudocapacitive region of the voltammetry. Evidence for the contribution of the double layer to transient mass transfer events is presented. In addition, a model circuit and appropriate theoretical analysis are used to illustrate the transient responses of a time variant faradaic component. This in conjunction with the experimental evidence shows that, far from being a passive component in this system, the double layer can contribute to HMV faradaic reactions under certain conditions.

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Published date: 22 July 2010
Organisations: Chemistry

Identifiers

Local EPrints ID: 180103
URI: http://eprints.soton.ac.uk/id/eprint/180103
ISSN: 1932-7447
PURE UUID: d7e3de56-06c6-4704-b881-ef8afa24fdf0
ORCID for Peter R. Birkin: ORCID iD orcid.org/0000-0002-6656-4074

Catalogue record

Date deposited: 06 Apr 2011 13:06
Last modified: 26 Nov 2019 02:02

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