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Electron spin resonance and x-ray photoelectron spectroscopic studies on an electrochemically deposited film of mixed manganese/vanadium oxides

Published online by Cambridge University Press:  03 March 2011

Masaharu Nakayama*
Affiliation:
Faculty of Engineering, Department of Applied Chemistry, Yamaguchi University, 2–16–1 Tokiwadai, Ube 755–8611, Japan
Masanori Nishio
Affiliation:
Faculty of Engineering, Department of Applied Chemistry, Yamaguchi University, 2–16–1 Tokiwadai, Ube 755–8611, Japan
Kotaro Ogura
Affiliation:
Faculty of Engineering, Department of Applied Chemistry, Yamaguchi University, 2–16–1 Tokiwadai, Ube 755–8611, Japan
*
a)Address all correspondence to this author. e-mail: nkymm@yamaguchi-u.ac.jp
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Abstract

A thin film of mixed manganese and vanadium oxides was formed on a platinum electrode by electro-oxidation of Mn2+ precursors in aqueous solution with VO3. X-ray analysis revealed that the film consists of an amorphous phase including trivalent and tetravalent Mn ions. The infrared spectrum exhibited the bands attributable to V2O5, suggesting that protonation and dehydration of VO3 occur to form the polymeric structure. The mixed oxide film showed no electron spin resonance signal in an as-deposited state. After the film-coated electrode was immersed into water and then dehydrated, however, a characteristic signal (g = 2.022) of Mn2+ in the solid phase appeared, accompanying a decrease in the vanadium content. This suggests that Mn3+ ions not in the oxide network, but pairing with unreacted VO3, are disproportionated to MnO and MnO2 by the reaction with water, while the VO3 is diffused to keep the charge valance of the film.

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Articles
Copyright
Copyright © Materials Research Society 2003

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Electron spin resonance and x-ray photoelectron spectroscopic studies on an electrochemically deposited film of mixed manganese/vanadium oxides
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