NDLI: Co-sensitization promoted light harvesting with a new mixed-addenda polyoxometalate $[Cu(C_{12}H_{8}N_{2})_{2}]_{2}[V_{2}W_{4}O_{19}]·4H

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Chen, Wei-lin Liu, Zhu-jun Wang, Yan-hua Wang, En-bo Shan, Chun-hui Su, Zhong-min Li, Yang-guang Xu, Sha-sha
Description	Author Affiliation: Xu SS ( Key Laboratory of Polyoxometalate Science of Ministry of Education, Department of Chemistry, Northeast Normal University, Changchun 130024, P. R. China. chenwl@nenu.edu.cn wangeb889@nenu.edu.cn wangeb889@hotmail.com.)
Abstract	A di-vanadium-substituted Lindqvist-type polyoxometalate $[Cu(C_{12}H_{8}N_{2})_{2}]_{2}[V_{2}W_{4}O_{19}]·4H_{2}O$ (1) was hydrothermally synthesized and characterized structurally by single crystal X-ray diffraction analysis. X-ray photoelectron spectroscopy and energy disperse spectroscopy tests further prove the existence of vanadium. Ultraviolet photoelectron spectroscopy and density functional theoretical studies indicate that the energy level of 1 matches well with the conduction band of the $TiO_{2}.$ Furthermore, considering the semiconductor-like nature of 1 and the introduction of transition metal element Cu synchronously extends the absorption to the visible region, which should also be beneficial to the photovoltaic device performance. 1-Doped $TiO_{2}$ composites (denoted as $1@TiO_{2})$ have been successfully fabricated by a simple sol–gel method, and introduced into the dye-sensitized solar cells (DSSCs) as co-sensitizers in N719-sensitized photoanodes by mixing $1@TiO_{2}$ with P25 nanoparticles with different weight ratios to enhance the photoelectric conversion efficiency. The investigations show that the DSSC assembled with $1@TiO_{2}/19P25$ photoanode has the best performance and the overall improvement of the efficiency is 21.6% compared with pure P25. Furthermore, the electrochemical impedance spectroscopy and open-circuit voltage decay investigations show that the cosensitization of 1 and N719 can promote electron transfer and restrain charge recombinations in the DSSCs, resulting in a longer electron lifetime.
ISSN	14779226
Issue Number	42
Journal	Dalton Trans.
Volume Number	44
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2015-11-14
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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