Preparation of Anodes for Oxygen Evolution by Electrodeposition of Composite Oxides of Pb and Ru on Ti

Composite oxides of Pb and Ru have been deposited on Ti rotating disc electrodes and tested as anode materials for the oxygen evolution reaction (oer) from aqueous sulfuric acid. The composite oxides have been anodically deposited according to two different procedures: (i) the electrolysis of suspensions of RuO2 particles in Pb2+-containing electrolytes, or (ii) the electrolysis of solutions containing both Pb2+ and Ru3+. Both procedures are essentially successful, as the passivation of Ti (previously etched in aqueous HF) does not prevent oxide deposition. The former route leads to more active materials than the latter. Considering the oer overpotential and service life, the performance of these layers deposited on Ti is comparable to or better than those of oxides grown on a noble substrate (described in a previous paper).