A Comparative Study of Ce³⁺/Ce⁴⁺ Redox Couple on Pt Electrode in Sulfuric Acid and Methanesulfonic Acid

Authors

Zhao-hua LI, State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Zhejiang University of Technology, Hangzhou 310014, China;
You-qun CHU, State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Zhejiang University of Technology, Hangzhou 310014, China;
Chun-an MA, State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Zhejiang University of Technology, Hangzhou 310014, China;Follow

Corresponding Author

Chun-an MA(science@zjut.edu.cn)

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

DOI Link

https://doi.org/10.61558/2993-074X.2105

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

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