Abstract
A comparative electrooxidation of Eg in the alkaline solution was investigated over Pt, Pd and Au nanoparticle-modified carbon-ceramic electrode. The kinetic parameters of Eg oxidation, i.e., Tafel slope and activation energy (E a), were determined on the modified electrodes. The lowest E a value of 8.9 kJ mol−1 was calculated on Pt|CCE. In continuation, the reaction orders with respect to the Eg and NaOH concentrations on Pd|CCE were found to be 0.4–0.2 and 0.6, respectively. An adsorption equilibrium constant (b) of 22.36 M−1 and the adsorption Gibbs energy change (ΔG°) of −7.7 kJ mol−1 were obtained on Pd|CCE. The chronopotentiometry (CP) and chronoamperometry (CA) results showed that Pd|CCE and then Au|CCE have better performance stability than Pt|CCE for Eg electrooxidation. Additionally, the electrochemical impedance spectroscopy (EIS) suggested faster electron-transfer kinetics on Pt than that on the Pd and Au electrocatalysts.
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We gratefully acknowledge the support of this work by Urmia University.
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Habibi, E. Kinetics of ethylene glycol electrooxidation on the noble metal-based nano-catalysts. J IRAN CHEM SOC 14, 1983–1991 (2017). https://doi.org/10.1007/s13738-017-1136-7
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DOI: https://doi.org/10.1007/s13738-017-1136-7