An investigation of electrochemical contact processes for silver-wire|glassy carbon and silver-coated cotton textile|glassy carbon

Demudu Babu Gorle, Sembanadar Karuppusamy, M. Anbu Kulandainathan, Daping He, Frank Marken

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The electrochemical contact between a glassy carbon substrate and a silver wire or a silver-coated cotton fabric (mechanically fastened to the electrode) is investigated in aqueous phosphate buffer media (with and without sulfide). In contrast to a conventional silver electrode immersed in solution, the "contact" between a silver wire and glassy carbon suffers "anodic disconnection". Voltammetry, impedance, and chronoamperometry experiments are performed to explore the effect of applied potential on the mechanism of "disconnection/reconnection" processes for the electrochemical contact. A (solubility product dependent) nucleation process with transfer of silver from the coated metal to the glassy carbon is proposed for the "reconnection" mechanism. Furthermore, the effects of (i) HS- in the buffer environment and (ii) H2S vapour exposure followed by voltammetry, IR, and Raman spectroscopy are investigated in terms of potential for sulfide detection/monitoring applications.

Original languageEnglish
Pages (from-to)2814-2822
Number of pages9
JournalNew Journal of Chemistry
Volume40
Issue number3
Early online date29 Jan 2016
DOIs
Publication statusPublished - 1 Mar 2016

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Materials Chemistry

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