Abstract
The electrochemical oxidations of Ce3+ to Ce4+ on Pt rotating disk electrode (RDE) in both sulfuric acid and methanesulfonic acid (MSA) solutions were studied by using cyclic voltammetry and linear sweep voltammetry. The complexing behaviors of Ce3+/Ce4+ were preliminarily probed and the exchange current density, diffusion coefficient, as well as reaction rate constant were obtained from Butler-Volmer equation. The activation energies of Ce3+ oxidation on Pt electrode in two types of acidic media, obtained from Arrhenius equation, were also compared. The results indicate that Ce3+ can be oxidized to Ce4+ much easier in sulfuric acid than in MSA solutions. The equilibrium potential in sulfuric acid solutions moves negatively due to the predominant complexation of Ce4+, while that in MSA solutions positively because of the predominant complexation of Ce3+, The larger values of activation energy for the oxidation of Ce3+ to Ce4+ on Pt electrode in sulfuric acid solutions suggest that the oxidation of Ce3+ occurs more readily and the electro-oxidation of cerous sulfate is more susceptible to temperature.
Graphical Abstract
Keywords
exchange current density, diffusion coefficient, rate constant, anode oxidation, activation energy
Publication Date
2013-04-28
Online Available Date
2012-03-30
Revised Date
2012-03-21
Received Date
2012-02-14
Recommended Citation
Zhao-hua LI, You-qun CHU, Chun-an MA.
A Comparative Study of Ce3+/Ce4+ Redox Couple on Pt Electrode in Sulfuric Acid and Methanesulfonic Acid[J]. Journal of Electrochemistry,
2013
,
19(2): 141-145.
DOI: 10.61558/2993-074X.2105
Available at:
https://jelectrochem.xmu.edu.cn/journal/vol19/iss2/3
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