An investigation of electrochemical contact processes for silver-wire|glassy carbon and silver-coated cotton textile|glassy carbon. (29th January 2016)

• Record Type: Journal Article
• Authors: Gorle, Demudu Babu; Karuppusamy, Sembanadar; Kulandainathan, M. Anbu; He, Daping; Marken, Frank
• Is Part Of: New journal of chemistry. Volume 40:Number 3(2016:Mar.)
• Page Start: 2814
• Page End: 2822
• Publication Date: 2016-01-29
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/c5nj02702k
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Silver-coated cotton textile discs in contact to glassy carbon exhibit environment dependent electrochemical contact reactivity. 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) H2 S vapour exposure followed by voltammetry, IR, and Raman spectroscopy are investigated in terms of potential for sulfide detection/monitoring applications.