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Potentials of zero charge and capacitance minima of polycrystalline gold in sodium fluoride solutions

โœ Scribed by Karen M. Dickinson; Karina E. Hanson; Ronald A. Fredlein

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
245 KB
Volume
37
Category
Article
ISSN
0013-4686

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โœฆ Synopsis

The potential of zero charge (pzc) of polycrystalline gold in sodium 5uoride solutions was determined using the piezoelectric technique and compared with the potential of the capacitance minimum. EC, measured simultaneously. In general the two do not coincide which is in keeping with the surface heterogeneity model of polycrystalline metals. A series of oxidation/reduction cycles causes thepzc to shift negatively and eventually become coincident with $. This is interpreted as due to the roughening of the surface. The results show no evidence of the specitic adsorption of 5uoride ions. An improved cell for the piezoelectric method is described.

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