An EQCM investigation of electrochemical precipitation of Mn (OH) 2 and its capacitance behavior

Prasant Kumar Nayak; S. Devaraj; N. Munichandraiah

doi:10.1149/1.3479665

An EQCM investigation of electrochemical precipitation of Mn (OH) ₂ and its capacitance behavior

Prasant Kumar Nayak
, S. Devaraj
, N. Munichandraiah

Indian Institute of Science Bangalore

Research output: Contribution to journal › Article › peer-review

16 Scopus citations

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 NO 3- 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 Mn_O2, which exhibits electrochemical supercapacitor behavior on subjecting to electrochemical cycling in a Na₂ SO₄ electrolyte. EQCM data indicate mass variations corresponding to surface insertion/extraction of Na+ ions during discharge/charge cycling.

Original language	English
Pages (from-to)	F29-F32
Journal	Electrochemical and Solid-State Letters
Volume	13
Issue number	11
DOIs	https://doi.org/10.1149/1.3479665
State	Published - 2010
Externally published	Yes

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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 NO 3- 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 Na2 SO4 electrolyte. EQCM data indicate mass variations corresponding to surface insertion/extraction of Na+ ions during discharge/charge cycling.",

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N2 - 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 NO 3- 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 Na2 SO4 electrolyte. EQCM data indicate mass variations corresponding to surface insertion/extraction of Na+ ions during discharge/charge cycling.

AB - 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 NO 3- 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 Na2 SO4 electrolyte. EQCM data indicate mass variations corresponding to surface insertion/extraction of Na+ ions during discharge/charge cycling.

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An EQCM investigation of electrochemical precipitation of Mn (OH) ₂ and its capacitance behavior

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