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Journal of Coordination Chemistry Volume 70, 2017 - Issue 17
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Articles

Determination of the stability constant of cobalt-substituted mono-lacunary Keggin-type polyoxometalate and its electrocatalytic water oxidation performance

Jiansheng LiSchool of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian, P. R. China
,
Jidan WangSchool of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian, P. R. China
,
Liuyang ZhangSchool of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian, P. R. China
,
Xiaojing SangSchool of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian, P. R. China
&
Wansheng YouSchool of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian, P. R. ChinaCorrespondence[email protected]
Pages 2950-2957 | Received 08 May 2017, Accepted 03 Aug 2017, Published online: 28 Aug 2017
 
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Abstract

The anion form of a cobalt-substituted mono-lacunary Keggin-type polyoxometalate (POM) complex in aqueous solution was identified as [Co(H2O)(H3PW11O39)]2− and its stability constant was determined to be 5.19 × 104 by spectrophotometry. Additionally, the electrocatalytic performances toward water oxidation of different concentrations of [Co(H2O)(H3PW11O39)]2− were investigated in the neutral phosphate buffer solution, and it was found that [Co(H2O)(H3PW11O39)]2− anion itself has little activity; the activity of [Co(H2O)(H3PW11O39)]2− solution actually results from dissociated [Co(H2O)6]2+. This work provides a simple way to understand the origin of catalytic water oxidation activity of a POM-based complex.

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