VOLTAMMETRIC STUDIES OF COMPOSITE CERAMIC CARBON WORKING ELECTRODES

Sol-gel derived indicator ceramic carbon electrodes (CCEs) made of gra phite powder entrapped in hydrophobically modified silica gel are pres ented. Voltammetric characteristics of the electrodes are compared wit h other classes of graphite electrodes. Background current, double lay er capacitance and metrological characteristics, including renewal rep eatability, interelectrode reproducibility and operational stability f or various solvents are presented. The indicator CCEs exhibit better s tability than carbon paste electrodes and their renewal is easier and more reproducible than that of glassy carbon electrodes.