Md. Krotova et al., DIAMOND-LIKE CARBON ELECTRODES - THE IMPEDANCE SPECTROSCOPY AND KINETICS OF REDOX REACTIONS, Russian journal of electrochemistry, 34(9), 1998, pp. 934-939
The impedance spectra and the oxidation and reduction voltammetric cur
ves in solutions of quinone and hydroquinone in 0.5 M H2SO4 are measur
ed for amorphous diamondlike carbon (a-C : H) electrodes deposited ont
o glassy carbon substrates by the magnetron sputtering or ion source t
echniques. The electrode's equivalent circuit includes a constant-phas
e element. Only relatively narrow-bandgap films possess an inherent el
ectrochemical activity. The wide-bandgap a-C : H becomes electrochemic
ally active upon introducing a Pt admixture (approximately 10%) in the
course of the film growth. The Pt-doped a-C : H is similar, in its ki
netic characteristics, to the boron-doped polycrystalline diamond.