Generator−Collector Experiments at a Single Electrode: Exploring the General Applicability of This Approach by Comparing the Performance of Surface Immobilized versus Solution Phase Sensing Molecules

Henstridge, Martin C., Wildgoose, Gregory and Compton, Richard G. (2010) Generator−Collector Experiments at a Single Electrode: Exploring the General Applicability of This Approach by Comparing the Performance of Surface Immobilized versus Solution Phase Sensing Molecules. Langmuir, 26 (2). pp. 1340-1346.

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Abstract

We demonstrate proof-of-concept that generator-collector experiments can be performed at a single macroelectrode and used to determine mechanistic information. The practical advantages of such a system over conventional generator-collector techniques are also outlined. The single-electrode generator-collector technique is applied to study the known mechanism of oxygen reduction in aqueous conditions as a model system. We seek to demonstrate that the single-electrode generator-collector approach is capable of detecting local pH changes, immediately adjacent to the electrode surface during a redox reaction. Experiments are performed using a molecular pH probe attached to the electrode surface. Comparison of experimental data with numerical simulations verifies that the reduction of oxygen at pH 6.8 proceeds via a two-electron, two-proton mechanism. Experiments were also performed with a molecular pH probe dissolved in the electrolyte solution in order to explore the feasibility of this approach, which is potentially applicable to a much wider range of electrochemical systems.

Item Type: Article
Faculty \ School: Faculty of Science > School of Chemistry
University of East Anglia > Faculty of Science > Research Groups > Physical and Analytical Chemistry
University of East Anglia > Faculty of Science > Research Groups > Synthetic Chemistry
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Depositing User: Rachel Smith
Date Deposited: 31 Mar 2011 11:43
Last Modified: 25 Jul 2018 04:14
URI: https://ueaeprints.uea.ac.uk/id/eprint/27468
DOI: 10.1021/la902418v

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