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TitleElectrochemical double-layer capacitance of metals, including some precious metals: preliminary results
AuthorScromeda, N; Katsube, T J
SourceGeological Survey of Canada, Current Research (Online) no. 2008-5, 2008, 8 pages, (Open Access)
PublisherNatural Resources Canada
Mediaon-line; digital
File formatpdf (Adobe Acrobat Reader)
Subjectsmetallic minerals; geochemistry; induced polarization; platinum; gold; silver; analytical methods; graphite; metals; electrodes
Illustrationsgraphs; plots; tables
Released2008 04 01
AbstractSpectral-induced polarization characteristics of four types of metals, including three precious metals, platinum, gold, and silver, and also stainless steel have been measured. The purpose was to determine their electrochemical double-layer capacitance (CE) characteristics, because their effect requires elimination when using these metals as electrodes in a two-electrode rock- or soil-sample measuring system. Whereas four-electrode systems automatically eliminate such effects, complications develop when varied frequencies or pressures are used, and when rock or soil textural elements require examination.

Results indicate that the CE and its frequency dependence coeffi cient (alpha-E) values for these metals are in the ranges of 3.09 × 10-5 F/cm2 to 6.42 × 10-5 F/cm2 and 0.185 to 0.350, respectively. These values are somewhat smaller than those of the graphite electrodes, which are generally in the ranges of 1.06 × 10-4 F/cm2 to 4.07 × 10-4 F/cm2 and 0.181 to 0.360, respectively.