Abstract
Four electrochemical oscillations of different types (named oscillations α, β, γ, and δ), which are different from previously reported Frumkin-type oscillations in low ionic strength electrolytes, appear for peroxodisulfate (S2O82-) reduction on Pt and Au electrodes under high ionic strength conditions. Impedance measurements for oscillation γ that appears in a region of the most positive potentials have shown that it is classified as hidden negative differential resistance (hidden-NDR or HNDR) oscillators. Detailed electrochemical measurements have suggested that the NDR arises from a decrease (with a negative potential shift) in the surface coverage of adsorbed OH, which acts as a catalyst for the dissociative adsorption of S2O82- (the first step of its reduction). The NDR is hidden by the desorption (with the negative potential shift) of adsorbed sulfate (SO42-) produced by the dissociative adsorption and reduction of S2O82-, which works as a site-blocking agent. Mathematical simulation based on this m...
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