Electrochemical and Structural Characterization of Polymer Gel Electrolytes Based on a PEO Copolymer and an Imidazolium-Based Ionic Liquid for Dye-Sensitized Solar Cells

被引：87

作者：

Freitas, Flavio S. ^{[1
]}

de Freitas, Jilian N. ^{[1
]}

Ito, Bruno I. ^{[1
]}

De Paoli, Marco-A. ^{[1
]}

Nogueira, Ana F. ^{[1
]}

机构：

[1] Univ Estadual Campinas, LNES, BR-13083970 Campinas, SP, Brazil

来源：

ACS APPLIED MATERIALS & INTERFACES | 2009年 / 1卷 / 12期

基金：

巴西圣保罗研究基金会;

关键词：

dye-sensitized solar cells; polymer gel electrolyte; ionic liquid; stability; POLYCRYSTALLINE TIO2 ELECTRODES; TEMPERATURE MOLTEN-SALTS; FLAT-BAND POTENTIALS; SOLID-STATE; HIGH-EFFICIENCY; SPECTROSCOPIC DETERMINATION; RUTHENIUM SENSITIZER; ORGANIC-DYES; PERFORMANCE; PHOTOCURRENT;

D O I：

10.1021/am900596x

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Polymer electrolytes based on mixtures of poly(ethylene oxide-co-propylene oxide) and 1-methyl-3-propyl-imidazolium iodide (MPII) were investigated, aiming at their application in dye-sensitized solar cells (DSSC). The interactions between the copolymer and the ionic liquid were analyzed by infrared spectroscopy and H-1 NMR. The results show interactions between the ether oxygen in the polymer and the hydrogen in the imidazolium cations. The ionic conductivities, electrochemical behaviors, and thermal properties of the electrolytes containing different concentrations of MPII were investigated. The electrolyte containing 70 wt % MPII presented the highest ionic conductivity (2.4 x 10(-3) S cm(-1)) and a diffusion coefficient of 1.9 x 10(-7) cm(2) s(-1). The influence of Lil addition to the electrolytes containing different concentrations of MPII was also investigated. The DSSC assembled with the electrolyte containing 70 wt % MPII showed an efficiency of 3.84% at 100 mW cm(-2). The stability of the devices for a period of 30 days was also evaluated using sealed cells. The devices assembled with the electrolyte containing less ionic liquid showed to be more stable.

引用

页码：2870 / 2877

页数：8

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