Abstract
Stationary polarization curves of oxygen evolution were measured on various mixed oxide electrodes of the spinel and perovskite group and on Raney nickel electrodes made by the technology of the Nuclear Research Center Juelich (KFA) in the current density range 0.05–1.0 Acm −2 in 10 M KOH at 100°C and under atmospheric pressure. The mixed oxide electrodes were either prepared from ready-made mixed oxides or produced in the form of thin coatings by the thermal decomposition of the corresponding nitrate solutions on various Ni bases. The greatest activity was shown with the Raney nickel anodes made by KFA technology, the oxygen overvoltage at most of the mixed oxide electrodes on a compact Ni base was approx. 40–80 mV higher. This difference can be reduced to approx. 10–40 mV by using a sintered Ni base (measured in the course of 240 h to date). It was established that the thermal decomposition of (Sr + Co) nitrates at 500–550°C did not lead to a perovskite structure, nevertheless, the mixed oxide coating formed was just as active as other effective mixed oxide coatings of the spinel or perovskite group.
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