Electrochemical behavior of diamond-like carbon film electrodes in aqueous electrolytes

摘要

"Institute for Superhard Materials National Academy of Sciences 3 Krzhyzhanqvsy st.,Kyiv -142,Ukraine 03142 The problem of electrode material for realization a wide spectrum of reactions is an old problem of electrochemistry.It remains to be actual up today.The electrode must have high electrocatalytic activity and stability of working characteristics,and also the desired properties:corrosive inertness,selectivity and availability of initial materials.The electrodes based on diamond and diamond-like materials meet most of indicated requirements.The films of amorphous carbon,so-called a-C films,being inexpensive material keep all advantages of conducting diamond electrodes-high corrosion resistance,wide range of ideal polarizability in the background electrolytes,sensitivity to the small concentrations of depolarizer.There are available,inexpensive methods of obtaining a-C films with high performance characteristics.The results of study electrochemical properties of a-C films,deposited on conducting substrates (including ones with formation of transitional layer of carbide phase for the improvement of adhesion) are presented in this work.The electrochemical activity of a-C films was estimated from data of cyclic voltammetry in solutions of the systems [Fe(CN)_6],Ce~(4+/3+),the resistance of electrodes-from data of impedancemetry in the solution of 0,5 M H_2SO_4.Experiment.