In Situ Synthesized Economical Tungsten Dioxide Imbedded in Mesoporous Carbon for Dye-Sensitized Solar Cells As Counter Electrode Catalyst

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• 作者：Mingxing Wu ; Xiao Lin ; Liang Wang ; Wei Guo ; Yudi Wang ; Jinqiu Xiao ; Anders Hagfeldt ; Tingli Ma
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：November 17, 2011
• 年：2011
• 卷：115
• 期：45
• 页码：22598-22602
• 全文大小：822K
• 年卷期：v.115,no.45(November 17, 2011)
• ISSN：1932-7455

文摘

Tungsten dioxide imbedded in mesoporous carbon (WO₂鈥揗C) was obtained by in situ synthesis and then introduced into dye-sensitized solar cells (DSCs) as a counter electrode (CE) catalyst. Catalytic activity for redox couple regeneration was improved significantly through combining high electrical conductivity and catalytic activity into one material, WO₂鈥揗C, in which WO₂ served as a catalyst and MC served as an electrical conductor. This has been proved by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The triiodide/iodide-based DSC using WO₂鈥揗C as CE showed a high power conversion efficiency (PCE) of 7.76%, which surpassed the performance of the DSC using traditional Pt CE (7.55%). In addition, the WO₂鈥揗C and WO₂ nanorods exhibited higher catalytic activity than Pt for the regeneration of a new organic redox couple, di-5-(1-methyltetrazole) disulfide/5-mercapto-1-methyltetrazole N鈥搕etramethylammonium salt (T₂/T^{鈥?/sup>). The PCE of the T₂/T鈥?/sup>-based DSCs using WO₂鈥揗C, WO₂, and Pt were 5.22, 4.66, and 3.09%, respectively.}