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A New Solid-state Composite Electrolyte LiI/3-hydroxypropionitrile/ SiO2 for Dye-sensitized Solar Cell

Wang, Hongxia, Li, Hong, Wang, Zhaoxiang, Meng, Qingbo, & Chen, Liquan (2005) A New Solid-state Composite Electrolyte LiI/3-hydroxypropionitrile/ SiO2 for Dye-sensitized Solar Cell. Journal of the American Chemical Society, 127(17), pp. 6394-6401.

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Abstract

A new compound, LiI(3-hydroxypropionitrile)2, is reported here. According to its single-crystal structure (C2/c), this compound has 3-D transporting paths for iodine. Further ab initio calculation shows that the activation energy for diffusion of iodine (0.73 eV) is much lower than that of lithium ion (8.39 eV) within the lattice. Such a mono-ion transport feature is favorable as solid electrolyte to replace conventional volatile organic liquid electrolytes used in dye-sensitized solar cells (DSSC). LiI and 3-hydroxypropionitrile (HPN) can form a series of solid electrolytes. The highest ambient conductivity is 1.4 × 10-3 S/cm achieved for LiI(HPN)4. However, it tends to form large crystallites and leads to poor filling and contact within porous TiO2 electrodes in DSSC. Such a drawback can be greatly improved by introducing micrometer-sized and nanosized SiO2 particles into the solid electrolyte. It is helpful not only in enhancing the conductivity but also in improving the interfacial contact greatly. Consequently, the light-to-electricity conversion efficiency of 5.4% of a DSSC using LiI(HPN)4/15 wt % nano-SiO2 was achieved under AM 1.5 simulated solar light illumination. Due to the low cost, easy fabrication, and relatively high conversion efficiency, the DSSC based on this new solid-state composite electrolyte is promising for practical applications.

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128 citations in Web of Science®

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ID Code: 10375
Item Type: Journal Article
Additional Information: This article is freely available from the American Chemical Society website 12 months after the publication date. See links to publisher website in this record.
DOI: 10.1021/ja043268p
ISSN: 0002-7863
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Copyright Owner: Copyright 2005 American Chemical Society
Copyright Statement: The contents of this journal can be freely accessed online via the ACS web page 12 months after publication. See link to ACS website.
Deposited On: 24 Oct 2007
Last Modified: 29 Feb 2012 23:20

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