TITLE:
Visible photoluminescence of polyoxoniobates in aqueous solution and their high electrocatalytic activities for water oxidation
AUTHORS:
Yichen Ye, Congcong Chen, Hui Feng, Jin Zhou, Juanjuan Ma, Jianrong Chen, Junhua Yuan, Lichun Kong, Zhaosheng Qian
KEYWORDS:
PONbs; Photoluminescence; NBO Analysis; Electrocatalysis; Water Oxidation
JOURNAL NAME:
Open Journal of Inorganic Chemistry,
Vol.3 No.3,
June
25,
2013
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.