An EQCM Investigation of Electrochemical Precipitation of Mn(OH)(2) and Its Capacitance Behavior

Nayak, Prasant Kumar and Devaraj, S and Munichandraiah, N (2010) An EQCM Investigation of Electrochemical Precipitation of Mn(OH)(2) and Its Capacitance Behavior. In: Electrochemical and Solid-State Letters, 13 (11). F29-F32.

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Abstract

Electrochemical quartz crystal microbalance (EQCM) has been used to study the electrochemical precipitation of Mn(OH)(2) on a Au crystal and its capacitance properties. From the EQCM data, it is inferred that NO3- ions get adsorbed on the Au crystal and then undergo reduction, resulting in an increase in pH near the electrode surface. Precipitation of Mn2+ occurs as Mn(OH)(2), with an increase in mass of the Au crystal. Mn(OH)(2) undergoes oxidation to MnO2, which exhibits electrochemical supercapacitor behavior on subjecting to electrochemical cycling in a Na2SO4 electrolyte. EQCM data indicate mass variations corresponding to surface insertion/extraction of Na+ ions during discharge/charge cycling. (C) 2010 The Electrochemical Society. DOI: 10.1149/1.3479665] All rights reserved.

Item Type:	Journal Article
Publication:	Electrochemical and Solid-State Letters
Publisher:	The Electrochemical Society
Additional Information:	Copyright of this article belongs to The Electrochemical Society.
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	08 Nov 2010 10:02
Last Modified:	08 Nov 2010 10:02
URI:	http://eprints.iisc.ac.in/id/eprint/33672

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