Abstract
In order to determine the optimum molar ratio between methanesulfonic acid (MSA) and sulfuric acid, linear sweep voltammetry (LSV), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) were used to investigate the electrochemical behaviors of cerium (III)/cerium (IV) (Ce3+/Ce4+couple on a Pt electrode in a mixed acid solution. Various concentrations of sulfuric acid were considered in the experiments, while the concentration of MSA was fixed at 1.0 mol·L-1. It was found that the optimum concentration of sulfuric acid was 0.8 mol·L-1 since the current response was the highest in the control groups and Ce3+ was easier to be oxidized to Ce4+. In the mixed acid solution, the solubility of cerium (III) increased to 0.95 mol·L-1 from 0.25 mol·L-1 in 1.3 mol·L-1 sulfuric acid solution. Electrolytic experiment and liquid-phase oxidation had been taken to explore the application of the mixed acid medium. The results revealed that Ce3+ exhibited the excellent electrochemical activity and Ce4+demonstrated a stronger oxidation capacity in the mixed acid solution.
Graphical Abstract
Keywords
mixed acid, current efficiency, solubility, current efficiency
Publication Date
2017-12-28
Online Available Date
2017-01-10
Revised Date
2017-01-05
Received Date
2016-08-27
Recommended Citation
Zhao-hua LI, Jiao-long XU, Ting WU.
Electrochemical Behaviors of Ce3+/Ce4+ Couple in a Mixed-Acid Medium of CH3SO3H and H2SO4[J]. Journal of Electrochemistry,
2017
,
23(6): 718-723.
DOI: 10.13208/j.electrochem.160827
Available at:
https://jelectrochem.xmu.edu.cn/journal/vol23/iss6/10
