Abstract
0.5 M hydrazine in aqueous H 2SO 4 for pHs in the range 1.5–3.75 catalytically oxidizes on polyaniline-filmed vitreous carbon, whereas the process is totally inhibited on the bare electrode substrate. The pH dependence of the reducing power of hydrazine accounts for the onset potential of the oxidation, while the currents are under pure kinetic control. A kinetic analysis of the “chemical” reduction of the emeraldine by hydrazine indicates that its rate characterizes the currents. Catalytic oxidation is faster in aprotic medium but the currents are transient owing to progressive deactivation of the polymer electrode.
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