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Electrochemical oxidation of aqueous sulfur dioxide II: comparative studies on platinum and gold electrodes

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posted on 2025-05-08, 16:02 authored by Jessica AllenJessica Allen, J. T. Hinkley, Scott DonneScott Donne
The reaction pathway of sulfur dioxide electro-oxidation on platinum and gold substrates is investigated here using a combination of static and rotating electrode voltammetric methods. A gold electrocatalyst does not need to be sulfur modified in order to display high activity, meaning the substrate is inherently more active than platinum. Analysis of diffusion behavior and reaction order on these substrates suggests that both kinetic and diffusion limitations control oxidation on each electrode. However, it is proposed that a similar oxidation pathway, involving adsorption and subsequent oxidation of sulfur dioxide on the electrode surface, is followed for an activated electrode. Mass changes were monitored at the electrode surface using an electrochemical quartz crystal microbalance, and both in- and ex-situ observations support this pathway proposal.

History

Journal title

Journal of the Electrochemical Society

Volume

159

Issue

9

Pagination

F585-F593

Publisher

Electrochemical Society

Language

  • en, English

College/Research Centre

Faculty of Science and Information Technology

School

School of Environmental and Life Sciences

Rights statement

© The Electrochemical Society, Inc. 2012. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS). The archival version of this work was published in Journal of the Electrochemical Society, Vol. 159, No. 9, pp. F585-F593.

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