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

References

[1] Wang C T, Hua Y J, Li G R, et al. Indirect cathodic electrocatalytic degradation of dimethylphthalate with PW11O39Fe(III)(H2O)4- and H2O2 in neutral aqueous medium[J]. Electrochimica Acta, 2008, 53(16): 5100-5105.

[2] Wang C T, Hua Y J, Tong Y X. A novel Electro-Fenton-Like system using PW11O39Fe(III)(H2O)4- as an electrocatalyst for wastewater treatment[J]. Electrochimica Acta, 2010, 55(22): 6755-6760.

[3] Hua Y J(华英杰), Wang C T(王崇太), Tong Y X (童叶翔), et al. Electrocatalytic degradation of nitrobenzene with Keggin-type PW11O39Fe(III)(H2O)4-[J]. Acta Chimica Sinica(化学学报), 2009, 67(23): 2650-2654.

[4] Hua Y J, Wang C T, Duan H, et al. Fabrication, characterization and electrocatalytic properties of a solid modified electrode based on PW11O39Fe(III)(H2O)4- and chitosan[J]. Electrochimica Acta, 2011, 58: 99-104.

[5] Brevard C, Schimpf R, Tourné G F, et al. Tungsten-183 NMR: A complete and unequivocal assignment of the tungsten-tungsten connectivities in heteropolytungstates via two-dimensional 183W NMR techniques[J]. Journal of American Chemistry Society, 1983, 105(24): 7059-7063.

[6] Zonnevijlle F, Tourné C M, Tourné G F, Preparation and characterization of iron(III)- and rhodium(III)-containing heteropolytungstates. identification of novel oxo-bridged iron(III) dimers[J]. Inorganic Chemistry, 1982, 21(7): 2751-2757.

[7] Bard A J, Faulkner L R. Electrochemical method, principle and application[M]. Bejing: Chemical Industry Press(化学工业出版社), 1986.

[8] Liu X L (刘希龙)，Wu C Y(吴春燕)，Zhou F(周方)，et al. Electrochemical properties of the Keggin-type lacunary heteropolysilicate anion and its electrocatalysis for H2O2 reduction[J]. Journal of Electrochemistry(电化学), 2012, 18(2): 174-180.