Diffusion Boundary Layer of a Rotating Disk Electrode As a Thin-Layer Spectroelectrochemical Cell

Ping Shi, Daniel Alberto Scherson

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

A UV-visible rapid scan spectrophotometer (RSS) was coupled to a Au rotating disk electrode (RDE) for monitoring at near-normal incidence the reflection-absorption spectrum of the diffusion boundary layer in [Fe(CN) 6]4- aqueous solutions over a potential region in which [Fe(CN)6]4- oxidizes, generating highly absorbing [Fe-(CN)6]3-max = 420 nm). Measurements were performed under steady-state conditions at rotation rates, ω, in the range 300 ≤ ω ≤ 2500 rpm, yielding well-defined spectra displaying characteristic features of [Fe(CN)6] 3-. In agreement with theoretical predictions, the absorbance A at λmax, using as a reference A(λmax) for the spectrum recorded at a potential negative to the onset of [Fe(CN) 6]4- oxidation, was found to be proportional both to the current and also to ω1/2 under conditions in which E was positive enough for the reaction to proceed under diffusion-limited control.

Original languageEnglish
Pages (from-to)2398-2400
Number of pages3
JournalAnalytical chemistry
Volume76
Issue number8
DOIs
Publication statusPublished - 2004 Apr 15
Externally publishedYes

ASJC Scopus subject areas

  • Analytical Chemistry

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