Electrocatalytic Properties of the Keggin-Type Co(II)-Substituted Heteropolyanion PW₁₁O₃₉Co(II)(H₂O)^5-

Authors

Bin WANG, School of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, China;
Chong-tai WANG, School of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, China;Follow
Ying-jie HUA, School of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, China;
Jin-yuan LIU, School of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, China;
Liang-fei ZHENG, School of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, China;

Corresponding Author

Chong-tai WANG(wct581@sina.com)

Abstract

The electrochemical properties of the Keggin-type Co(II)-substituted heteropolyanion PW₁₁O₃₉Co(II)(H₂O)^5- (PW₁₁Co), as well as the electrocatalytic properties of PW₁₁Co towards the anodic oxidations of H₂O₂ and CH₃OH were studied using the electrochemical methods such as cyclic voltammetry and AC impedance spectroscopy in this paper. An electrocatalytic mechanism of PW₁₁Co as an anodic medium was also proposed. It was found that PW₁₁Co showed a pair of pseudo-reversible redox peaks at the potentials of 1.367 V/1.266 V, corresponding to the redox responses of the Co(II)/Co(III) couple, apart from two pairs of reversible W—O skeleton redox peaks. A proton was involved in the electrode process of the Co(II)/Co(III) couple with an exchange current density (i₀) of 5.7×10^-6 A·cm^-2. In particular, the couple exhibited a high electrocatalytic activity towards the anodic oxidation of H₂O₂ in an acidic solution of pH 2.5, which can be coupled to catalyze the methanol oxidation.

Graphical Abstract

Keywords

Keggin-type Co-substituted heteropolyanion, hydrogen peroxide, methanol, electrocatalytic oxidation

DOI Link

https://doi.org/10.61558/2993-074X.2141

Publication Date

2013-10-28

Online Available Date

2013-03-20

Revised Date

2013-03-20

Received Date

2012-12-25

Recommended Citation

Bin WANG, Chong-tai WANG, Ying-jie HUA, Jin-yuan LIU, Liang-fei ZHENG. Electrocatalytic Properties of the Keggin-Type Co(II)-Substituted Heteropolyanion PW₁₁O₃₉Co(II)(H₂O)^5-[J]. Journal of Electrochemistry, 2013 , 19(5): 488-492.
DOI: 10.61558/2993-074X.2141
Available at: https://jelectrochem.xmu.edu.cn/journal/vol19/iss5/14