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Current Topics in Electrochemistry   Volumes    Volume 1 
Inner and outer surface proton exchange at oxide electrodes
G. Lodi, G. L. Zucchini, G. Battaglin, G. Della Mea, H. Chen, S. Trasatti
Pages: 157 - 166
Number of pages: 10
Current Topics in Electrochemistry
Volume 1 

Copyright © 1992 Research Trends. All rights reserved

Electrochemical performances of DSA-type oxide electrodes (eg, RuO2, IrO2, Co3O4) suggest that proton exchange between the oxide surface and the solution accompanies the surface modification. Experimental data point also to the existence of “inner” surface regions from which proton exchanges is retarded. Electrochemical data have been supplemented with tritium exchange experiments, and in depth proton profile determinations by means of nuclear reaction analysis. A consitstent picture has been obtained enabling conclusive evidence to be achieved for the mechanism of surface hydration of oxides, its involvement in electrochemical redox transition, and for the nature of the different behaviour of RuO2 and IrO2 with respect to Co3O4.
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