Kinetics of ethylene glycol electrooxidation on the noble metal-based nano-catalysts

Kinetics of ethylene glycol electrooxidation on the noble metal-based nano-catalysts 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of the Iranian Chemical Society Springer Journals

Kinetics of ethylene glycol electrooxidation on the noble metal-based nano-catalysts

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Publisher
Springer Journals
Copyright
Copyright © 2017 by Iranian Chemical Society
Subject
Chemistry; Analytical Chemistry; Inorganic Chemistry; Physical Chemistry; Biochemistry, general; Organic Chemistry
ISSN
1735-207X
eISSN
1735-2428
D.O.I.
10.1007/s13738-017-1136-7
Publisher site
See Article on Publisher Site

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.

Journal

Journal of the Iranian Chemical SocietySpringer Journals

Published: May 15, 2017

References

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