The stability of poly( o-phenylenediamine) as an electrode material

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The kinetics of the electrochemical degradation of poly( o-phenylenediamine) (POPD), deposited on platinum electrode, has been investigated at controlled electrode potential in 0.5 M sulfuric acid solution. The degradation process follows the first-order kinetics and depends on the electrode potential. Within the potential range investigated, −0.1 to 0.9 V, the degradation rate constants ( k) were found to vary between approximately 1.5×10 −5 and 4.4×10 −5 s −1 , and a linear dependence of these constants on the degradation potential ( E) has been found with the slope of k vs. E of ca. 2.9×10 −5 s −1 V −1 .