Electrochemical cell anode - with titanium carbide layer between titanium support and lead di:oxide layer

摘要

An electrochemical cell anode has a titanium support and a PbO2 surface layer (3), between which a titanium carbide intermediate layer is provided. Prodn. of the anode comprises (a) wetting the titanium support for 60 sec. with a soln. of furfuryl alcohol in isopropanol and shaking off excess soln.; (b) exposing the wet support to the vapour of 33% hydrochloric acid for 20-40 mins. in a sealed inert vessel; (c) heat treating the support at 800-1100 deg.C for 1-4 hrs. in a vacuum with a residual pressure of less than 1.33 x 10 power(-3) Pa to form a titanium carbide intermediate layer; and (d) after cooling, electrodepositing a PbO2 surface layer on the treated support. An alternative anode prodn. process involves reactive cathodic sputtering of a Ti target in an atmos. of 10-70% CH4 and balance Ar to deposit a TiC intermediate layer on the Ti support, followed by electrodeposition of the PbO2 surface layer. USE/ADVANTAGE - The anode is useful in ozone generating cells. The TiC intermediate layer replaces expensive precious metal layers, provides the anode with long term stability, and eliminates undesired passivation effects, cell voltage rise, etc.