Electrochemical Behaviors of Ce3+/Ce4+ Couple in a Mixed-Acid Medium of CH3SO3H and H2SO4

doi:10.13208/j.electrochem.160827

Abstract

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.

Key words: mixed acid, current efficiency, solubility, current efficiency

CLC Number:

O646.1

LI Zhao-hua, XU Jiao-long，WU Ting. Electrochemical Behaviors of Ce³⁺/Ce⁴⁺ Couple in a Mixed-Acid Medium of CH₃SO₃H and H₂SO₄[J]. Journal of Electrochemistry, 2017, 23(6): 718-723.

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Electrochemical Behaviors of Ce³⁺/Ce⁴⁺ Couple in a Mixed-Acid Medium of CH₃SO₃H and H₂SO₄

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