OXYGEN GAS EVOLUTION AND DETERIORATION OF RUO-2 - ZRO-2 COATED TITANIUM ANODES, AT ELEVATED TEMPERATURE IN STRONG BASE.
It was demonstrated that the addition of a second, more inert oxide (ZrO-2) to the active RuO-2 layer on a titanium substrate substantially increased the service life of DSA-type anodes with respect to oxygen gas evolution (i=0.75Acm**-2) in 6.0 mol dm -3- NaOH at 80betaC. The electrocatalytic activity of the mixed oxide layer for this reaction remained virtually constant on altering the composition over the range 60-100 mol-% RuO-2. The optimum service life (ca.200h) was observed with an 80/20 (RuO-2/ZrO-2) mol-% oxide mixture. Electron microscope studies showed that such a layer was highly cracked. The increased stability of the mixed oxide coated system is attributed to better protection of the base metal attack on the latter, leading to shedding of the active layer, being a major route for deterioration of this type of anode.
Bibliographic Reference: ELECTROCHIMICA ACTA, VOL. 29 (1984), NO. 2, PP. 211-216.
Record Number: 1989122078200 / Last updated on: 1987-01-01
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