GOLD AND PLATINUM POLY(CHLOROTRIFLUOROETHYLENE) COMPOSITE ELECTRODES

Two new poly(chlorotrlfliioroethylene) (Kel-F)/precious metal composite electrodes are described which contain 14% metal by volume, the Kelgold (Kel-F/ gold) and Kelplat (Kel-F/plat-inum) electrodes. The results of four-probe conductivity measurements on these highly conductive, consolidated composites are reported. The surfaces of these composite electrodes consist of ensembles of active sites (packed metal-particle regions). Scanning electron microscopic observations of the surface morphologies of Kelgold and Kelplat electrodes are discussed, Including the Influences of certain properties of the conductor powder and the fabrication pressure on active site morphologies. Cyclic voltammetry demonstrates enhanced current densities for these composite electrodes (relative to the corresponding macro disk electrodes). Active areas and large active perimeters for Kelgold and Kelplat electrodes are determined from short-time chronoamperometric data. The chronoamperometrlc data for Kelgold and Kelplat electrodes over the time range of ca. 10 ms to 100 s Is shown to conform to existing microelectrode ensemble theory. © 1990, American Chemical Society. All rights reserved.