Study of the underlying electrochemistry of polycrystalline gold electrodes in aqueous solution and electrocatalysis by large amplitude fourier transformed alternating current voltammetry

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Author list: Lertanantawong B., O'Mullane A.P., Surareungchai W., Somasundrum M., Burke L.D., Bond A.M.

Publisher: American Chemical Society

Publication year: 2008

Journal: Langmuir (0743-7463)

Volume number: 24

Issue number: 6

Start page: 2856

End page: 2868

Number of pages: 13

ISSN: 0743-7463

eISSN: 1520-5827

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-42149151540&doi=10.1021%2fla702454k&partnerID=40&md5=6b624e2509a6553fae6b0c5105e93d47

Languages: English-Great Britain (EN-GB)

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Abstract

Polycrystalline gold electrodes of the kind that are routinely used in analysis and catalysis in aqueous media are often regarded as exhibiting relatively simple double-layer charging/discharging and monolayer oxide formation/ removal in the positive potential region. Application of the large amplitude Fourier transformed alternating current (FT-ac) voltammetric technique that allows the faradaic current contribution of fast electron-transfer processes to be emphasized in the higher harmonic components has revealed the presence of well-defined faradaic (premonolayer oxidation) processes at positive potentials in the double-layer region in acidic and basic media which are enhanced by electrochemical activation. These underlying quasi-reversible interfacial electron-transfer processes may mediate the course of electrocatalytic oxidation reactions of hydrazine, ethylene glycol, and glucose on gold electrodes in aqueous media. The observed responses support key assumptions associated with the incipient hydrous oxide adatom mediator (IHOAM) model of electrocatalysis. ฉ 2008 American Chemical Society.

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