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Ordered Mesoporous Tungsten Suboxide Counter Electrode for Highly Efficient Iodine-Free Electrolyte-Based Dye-Sensitized Solar Cells

Title
Ordered Mesoporous Tungsten Suboxide Counter Electrode for Highly Efficient Iodine-Free Electrolyte-Based Dye-Sensitized Solar Cells
Authors
Inyoung JeongChangshin JoArockiam AnthonysamyJung-Min KimKang, EHwang, JRamasamy, ERhee, SWKim, JKKyoung-Su HaKi-Won JunJinwoo Lee
POSTECH Authors
Kim, JK
Date Issued
2013-02
Publisher
WILEY-BLACKWELL
Abstract
A disulfide/thiolate (T-2/T-) redox-couple electrolyte, which is a promising iodine-free electrolyte owing to its transparent and noncorrosive properties, requires alternative counter-electrode materials because conventional Pt shows poor catalytic activity in such an electrolyte. Herein, ordered mesoporous tungsten suboxide (m-WO3-x), synthesized by using KIT-6 silica as a hard template followed by a partial reduction, is used as a catalyst for a counter electrode in T-2/T- -electrolyte-based dye-sensitized solar cells (DSCs). The mesoporous tungsten suboxide, which possesses interconnected pores of 4 and 20 nm, provides a large surface area and efficient electrolyte penetration into the m-WO3-x pores. In addition to the advantages conferred by the mesoporous structure, partial reduction of tungsten oxide creates oxygen vacancies that can function as active catalytic sites, which causes a high electrical conductivity because of intervalence charge transfer between the W5+ and W6+ ions. m-WO3-x shows a superior photovoltaic performance (79% improvement in the power conversion efficiency) over Pt in the T-2/T- electrolyte. The superior catalytic activity of m-WO3-x is investigated by using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and Tafel polarization curve analysis.
Keywords
cyclic voltammetry; electrochemistry; mesoporous materials; platinum; tungsten; ORGANIC REDOX COUPLES; LOW-COST; PT-FREE; FREE CATALYSTS; CARBON; PERFORMANCE; GRAPHENE; NANORODS; DIOXIDE; FILMS
URI
https://oasis.postech.ac.kr/handle/2014.oak/14495
DOI
10.1002/CSSC.201200647
ISSN
1864-5631
Article Type
Article
Citation
CHEMSUSCHEM, vol. 6, no. 2, page. 299 - 307, 2013-02
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김진곤KIM, JIN KON
Dept. of Chemical Enginrg
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