Surface studies of a chalcogenide glass ferric ion-selective electrode Part 1: Influence of ferric and hydroxide ions on interfacial kinetics

B Pejcic; Roland De Marco; K Prince

doi:10.1002/sia.1449

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Surface studies of a chalcogenide glass ferric ion-selective electrode Part 1: Influence of ferric and hydroxide ions on interfacial kinetics

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Surface studies of a chalcogenide glass ferric ion-selective electrode Part 1: Influence of ferric and hydroxide ions on interfacial kinetics

B Pejcic, Roland De Marco and K Prince

Surface and Interface Analysis, Vol.33(9), pp.748-758

2002

DOI: https://doi.org/10.1002/sia.1449

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Abstract

chalcogenide

corrosion

ferric ion-selective electrode

hydroxide

impedance spectroscopy

SIMS

XPS

X-ray photoelectron spectroscopy (XPS), secondary ion mass spectrometry (SIMS), scanning electron microscopy (SEM) and in situ electrochemical impedance spectroscopy (EIS) have been used to characterize the interfacial chemistry of the chalcogenide glass ferric (FeIII) ion-selective electrode (ISE). The effects of ferric ions (Fe3+) and hydroxide ions (OH-) on the FeIII ISE have been studied and a mechanism for their action is proposed. It has been shown that an elevated hydroxide ion concentration causes the chalcogenide glass FeIII ISE to experience accelerated corrosion. In particular, XPS detected the formation of various antimony and iron hydroxide/oxide species, whereas SIMS and SEM revealed extensive dissolution of germanium selenide from the chalcogenide glass in the presence of OH-. The EIS measurements demonstrated that the rate of charge transfer is facilitated under extreme alkaline conditions, and this is internally consistent with the XPS/SIMS results. By contrast, EIS and XPS aging studies in ferric ion solution revealed a mild passivation film symbolic of an oxide layer. Extended aging of the chalcogenide glass membrane demonstrated a decrease in the charge transfer impedance, indicative of a breakdown in the passive layer properties. It has been shown that a charge transfer reaction occurs between Fe3+ and Ge2+ selenide sites in the membrane and that the rate of reaction is strongly dependent on temperature.

Details

Title: Surface studies of a chalcogenide glass ferric ion-selective electrode Part 1: Influence of ferric and hydroxide ions on interfacial kinetics
Authors: B Pejcic (Author) - Curtin University of Technology
Roland De Marco (Author) - Curtin University of Technology
K Prince (Author) - Australian Nuclear Science and Technology Organization
Publication details: Surface and Interface Analysis, Vol.33(9), pp.748-758
Publisher: John Wiley & Sons Ltd.
Date published: 2002
DOI: 10.1002/sia.1449
ISSN: 0142-2421
Organisation Unit: University of the Sunshine Coast, Queensland; Office of the Deputy Vice-Chancellor (Research and Innovation)
Language: English
Record Identifier: 99449096402621
Output Type: Journal article

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Collaboration types: Domestic collaboration
Web Of Science research areas: Chemistry, Physical