Visible photoluminescence of polyoxoniobates in aqueous solution and their high electrocatalytic activities for water oxidation

Yichen Ye, Congcong Chen, Hui Feng, Jin Zhou, Juanjuan Ma, Jianrong Chen, Junhua Yuan, Lichun Kong, Zhaosheng Qian

College of Chemistry and Life Science, Zhejiang Normal University, Jinhua, China.

DOI: 10.4236/ojic.2013.33009                

Abstract

The photoluminescence of four polyoxoniobates [Nb₆O₁₉]^8-, [Nb₁₀O₂₈]^6-, [Ti₂Nb₈O₂₈]^8- and [H₂Si₄Nb₁₆O₅₆]^14- was observed, and its origin was revealed in the view of molecular orbital by means of the computational method. The photoluminescence is originated from singlet transitions, and the calculated values agree well with the experimental data. The results indicate that the size of clusters and the foreigner atoms can affect the fluorescent properties of PONbs. The absorption and emission of these PONbs are originated molecular orbitals contributed mainly by μ₂-O and Nb atoms according to NBO analysis. These PONbs were also found as electrochemical catalysts with high performance for water oxidation, which can effectively split water into oxygen under basic condition with a high catalytic current, and pH values have remarkable influence on the electrocatalytic activities of these PONbs for water oxidation.

Keywords

PONbs; Photoluminescence; NBO Analysis; Electrocatalysis; Water Oxidation

Conflicts of Interest

The authors declare no conflicts of interest.

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