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In Situ Synthesized Economical Tungsten Dioxide Imbedded in Mesoporous Carbon for Dye-Sensitized Solar Cells As Counter Electrode Catalyst
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2011 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 115, no 45, 22598-22602 p.Article in journal (Refereed) Published
Abstract [en]

Tungsten dioxide imbedded in mesoporous carbon (WO(2)-MC) 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, WO(2)-MC, in which WO(2) 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 WO(2)-MC 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 WO(2)-MC and WO(2) 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-tetramethylammonium salt (T(2)/T(-)). The PCE of the T(2)/T(-)-based DSCs using WO(2)-MC, WO(2), and Pt were 5.22, 4.66, and 3.09%, respectively.

Place, publisher, year, edition, pages
2011. Vol. 115, no 45, 22598-22602 p.
National Category
Chemical Sciences
URN: urn:nbn:se:uu:diva-167658DOI: 10.1021/jp205886dISI: 000296685800061OAI: oai:DiVA.org:uu-167658DiVA: diva2:488207
Available from: 2012-02-01 Created: 2012-01-31 Last updated: 2012-02-01Bibliographically approved

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Hagfeldt, Anders
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Department of Physical and Analytical Chemistry
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