Ionic conductivity of solid polymer electrolytes for dye-sensitized solar cells

We developed an ionic conductivity model of solid polymer electrolytes for dye‐sensitized solar cells (DSSCs) based on the Nernst–Einstein equation in which the diffusion coefficient is derived from the molecular thermodynamic model. We introduced concentration‐dependence of the diffusion coefficien...

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Bibliographic Details
Published in:Journal of applied polymer science 2010-09, Vol.117 (6), p.3582-3587
Main Authors: Kim, Joo Wan, Bae, Young Chan
Format: Article
Language:English
Subjects:
Applied sciences
Diffusion coefficient
DSSCs
Dyes
Electrical, magnetic and optical properties
Electrolytes
Exact sciences and technology
Ionic conductivity
ionic conductivity model
Mathematical models
Moles
Organic polymers
PEO/LiI/I2 system
Physicochemistry of polymers
polymer electrolytes
Properties and characterization
Solar cells
Stainless steels
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Summary:We developed an ionic conductivity model of solid polymer electrolytes for dye‐sensitized solar cells (DSSCs) based on the Nernst–Einstein equation in which the diffusion coefficient is derived from the molecular thermodynamic model. We introduced concentration‐dependence of the diffusion coefficient into the model, and the diffusion coefficient was expressed by differentiating the chemical potential by concentration. The ionic conductivities of polymer electrolytes (PEO/LiI/I2 system) were investigated at various temperatures and compositions. We prepared a set of PEO in which an EO : LiI mole ratio of 10 : 1 was kept constant for PEO·LiI·(I2)n compositions with n = 0.02, 0.05, 0.1, 0.15, 0.2, and 0.3 (mole ratio of LiI : I2). The ionic conductivities of the electrolytes were measured using a stainless steel/polymer‐electrolyte/stainless steel sandwich‐type electrode structure using alternating current impedance analysis. The values calculated using the proposed model agree well with experimental data. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010
ISSN:0021-8995
1097-4628
1097-4628
DOI:10.1002/app.32243