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Insertion Reactions in Materials with Water-Containing Galleries

Published online by Cambridge University Press:  25 February 2011

R. A. Huggins ,
M. Wohlfahrt-Mehrens  and
L. JÖrissen
R. A. Huggins
Affiliation:
Center for Solar Energy and Hydrogen Research (ZSW), Helmholtz Str. 8, 7900 Ulm, Germany
M. Wohlfahrt-Mehrens
Affiliation:
Center for Solar Energy and Hydrogen Research (ZSW), Helmholtz Str. 8, 7900 Ulm, Germany
L. JÖrissen
Affiliation:
Center for Solar Energy and Hydrogen Research (ZSW), Helmholtz Str. 8, 7900 Ulm, Germany
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Abstract

The microscopic mechanism of the operation of the well - known “nickel” electrode involves the transport of protons through an outer layer of the Ni(OH)2 phase to the two-phase Ni(OH)2/NiOOH boundary, where the electrochemical reaction takes place. This boundary is displaced as the reaction proceeds. When it reaches the outer surface so that the NiOOH phase is in contact with the electrolyte, an additional process takes place, resulting in the rapid evolution of gaseous oxygen. Interpretation of the available thermodynamic data in terms of ternary phase equilibria shows that the equilibrium electrode potential should be more positive than that for the decomposition of water, as is experimentally observed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 293: Symposium U – Solid State Ionics III , 1992 , 57
Copyright
Copyright © Materials Research Society 1993

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