Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 2, Issue 8, Pages 2814-2821Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta14385f
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Funding
- Ocean University of China
- Fundamental Research Funds for the Central Universities [201313001, 201312005]
- Doctoral Fund of Ministry of Education of China [20130132120023]
- Research Project for the Application Foundation in Qingdao [13-1-4-198-jch]
- Shandong Province Outstanding Youth Scientist Foundation Plan [BS2013CL015]
- Shandong Provincial Natural Science Foundation [ZR2011BQ017]
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Aimed at enhancing the liquid electrolyte loading, ionic conductivity, and electrocatalytic activity toward iodides, a freeze-dried microporous polyacrylate-poly(ethylene glycol) (PAA-PEG) matrix was employed to uptake conducting substances, such as graphene, graphene oxide, and graphite. A liquid electrolyte loading of 21.1 g per g and a room-temperature ionic conductivity of 11.60 mS cm(-1) were obtained from the PAA-PEG/graphene conducting gel electrolyte. The conducting substances can form interconnected channels within the insulating microporous PAA-PEG matrix, therefore, the reduction reaction of triiodide ions in the dye-sensitized solar cells (DSSCs) can be extended from the Pt/gel electrolyte interface to both the interface and three-dimensional framework of the microporous conducting gel electrolyte. The resulting DSSCs made from PAA-PEG/graphene, PAA-PEG/graphene oxide, and PAA-PEG/graphite exhibit power conversion efficiencies of 7.74%, 6.49%, and 5.63%, respectively, which are much higher than 5.02% exhibited by a pure PAA-PEG-based DSSC. This new concept, along with ease of fabrication suggests that microporous conducting gel electrolytes could be good alternative electrolytes for use in efficient quasi-solid-state DSSCs.
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