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Proton Intercalation in γ-MnO2 from Ramsdellite to Groutite Through Groutellite

Published online by Cambridge University Press:  16 February 2011

Yves Chabre  and
Jean Pannetier
Yves Chabre
Affiliation:
Laboratoire de Spectromètrie Physique, Universitè Joseph Fourier-Grenoble and CNRS BP 87 F-38402 Saint Martin d'Hères, France
Jean Pannetier
Affiliation:
Institut Laue Langevin, BP 156 F-38042 Grenoble, France
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Abstract

This paper presents an investigation of electrochemical proton intercalation in two chemically prepared MDs containing low amounts of structural defects and in a natural MD containing 89%of highly crystalline ramsdellite. XRD examination of equilibrated partly reduced synthetic samples confirms the formation of groutite as a final reduction product and, before mid-reduction, suggests the formation of a solid solution between ramsdellite and groutellite H0.5MnO2. In contrast, electrochemical spectroscopy hint at a two-phase process with an equilibrium potential at –60 m V vs Hg/HgO. The implication of the structural defects on these observations are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 369: Symposium U – Solid State Ionics IV , 1994 , 97
Copyright
Copyright © Materials Research Society 1995

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