ORCID

Wipf: https://orcid.org/0000-0003-2365-1175 

Tenent: https://orcid.org/0000-0002-9178-3762

MSU Affiliation

College of Arts and Sciences; Department of Chemistry

Creation Date

2026-02-14

Abstract

A natural and artificial distribution of electron-transfer activity on glassy-carbon electrodes can be observed and quantified by use of scanning electrochemical microscopy (SECM). A large (7-fold) spread in rate-constant is found for randomly sampled sites on polished, untreated glassy-carbon surfaces. Direct-mode oxidation with the SECM tip was used to produce small regions of oxidized carbon on a polished surface. A large increase in electron-transfer rate for the Fe(II/III) ion is observed on the locally oxidized carbon surface in comparison to the unoxidized region. Rate-constant measurements made along a line profiles the transition from unoxidized to oxidized surfaces. SECM images of defect sites show reaction-rate variations. Rate constants measured at several locations of the defective surface allows discrimination between the kinetic and topographic components of the SECM image.

Publication Date

10-8-2008

Publication Title

Journal of Solid State Electrochemistry

Publisher

Springer

First Page

583

Last Page

590

Rights

This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: https://doi.org/10.1007/s10008-008-0689-x

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Digital Object Identifier (DOI)

https://doi.org/10.1007/s10008-008-0689-x