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• W2084667064 endingPage "974" @default.
• W2084667064 startingPage "968" @default.
• W2084667064 abstract "The electrochemical reduction of peroxycitric acid (PCA) coexisting with citric acid and hydrogen peroxide (H2O2) in the equilibrium mixture was extensively studied at a gold electrode in acetate buffer solutions containing 0.1 M Na2SO4 (pH 2.0–6.0) using cyclic and hydrodynamic voltammetric, and hydrodynamic chronocoulometric measurements. The reduction of PCA was characterized to be an irreversible, diffusion-controlled process, and the cyclic voltammetric reduction peak potential (Epc) was found to be more positive by ca. 1.0 V than that of the coexisting H2O2, e.g., the Epc values obtained at 0.1 V s−1 for PCA and H2O2 were 0.35 and −0.35 V, respectively, vs. Ag|AgCl|KCl (sat.) at pH 3.3. The Epc of PCA was found to depend on pH, i.e., at pH > 4.5, the plot of Epc vs. pH gave the slope (−64 mV decade−1) which is close to the theoretical value (−59 mV decade−1) for an electrode process involving the equal number of electron and proton in the rate-determining step, while at pH < 4.5, the Epc was almost independent of pH. The relevant electrochemical parameters, Tafel slope, number of electrons, formal potential (E0′), cathodic transfer coefficient and standard heterogeneous rate constant (k0′) for the reduction of PCA and the diffusion coefficient of PCA were determined to be ca. 100 mV decade−1, 2, 1.53 V (at pH 2.6), 0.29, 1.2 × 10−12 cm s−1 and 0.29 × 10−5 cm2 s−1, respectively, and except for E0′, the obtained values were almost independent of the solution pH. The overall mechanism of the reduction of PCA was discussed." @default.
• W2084667064 created "2016-06-24" @default.
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• W2084667064 date "2007-12-01" @default.
• W2084667064 modified "2023-10-11" @default.
• W2084667064 title "Electroreduction of peroxycitric acid coexisting with hydrogen peroxide in aqueous solution" @default.
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• W2084667064 doi "https://doi.org/10.1016/j.electacta.2007.08.010" @default.
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