Abstract
Three kinds of metal oxides, Al 2O 3, Cr 2O 3 and Fe 2O 3, all of which have the same crystal form, were used in powder form for the investigation of surface conductance in electrolyte solutions. The results obtained demonstrate that the surface conductance is remarkably affected by the type of electrolyte used, being larger in a solution containing polyvalent ions than in a solution containing lower valent ions. The surface charge density calculated by introducing the ζ potential data into the Gouy—Chapman equation changes with the type of electrolyte similarly to the surface conductance. This suggests that the surface conductance originates from ion transfer not only in the diffuse double layer but also in the Stern layer. The activation energy of surface conductance is larger with larger adsorbed ions, and smaller with smaller adsorbed ions, compared to that of bulk conductance.
Published Version
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