Abstract
PbO2+RuO2 composites have been electrodeposited onto Au rotating disc electrodes from suspensions of RuO2 in a mildly acidic lead nitrate+lead acetate electrolyte. These electrodeposits are stable at open circuit in H2SO4 solution, but not in acids, forming soluble Pb(II) salts. Tested as anodes for oxygen evolution from 0.5 mol l−1 H2SO4 at room temperature, PbO2+RuO2 composites exhibit fairly high catalytic activity with an overpotential of 250 mV at 100 mA cm−2 and a Tafel slope (slightly higher than 60 mV) close to that of stoichiometric RuO2 crystals. Their service life is limited, as observed previously for thermally prepared Ti/RuO2 films. Longer service life is shown by composite electrodes in which RuO2 is replaced with a mixed oxide of Ru and Sn.
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