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Analyses of structurally modified quasi‐solid‐state electrolytes using electrochemical impedance spectroscopy for dye‐sensitized solar cells
Author(s) -
Seo SeokJun,
Hinsch Andreas,
Veurman Welmoed,
Brandt Henning,
Kang MoonSung,
Shin SungHee,
Moon SeungHyeon
Publication year - 2014
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.39739
Subject(s) - dielectric spectroscopy , materials science , electrolyte , scanning electron microscope , chemical engineering , electrochemistry , phase inversion , tortuosity , porosity , polymer chemistry , chemistry , electrode , composite material , membrane , biochemistry , engineering
Electrochemical properties of structurally modified quasi‐solid‐state electrolytes were examined using porous substrates (PSs). The PS was prepared into two categories by a phase inversion method with a brominated poly(phenylene oxide) (BPPO): the sponge and finger types. Effects of the humidification and cosolvent compositions on the morphology of the PS were analyzed by scanning electron microscopy. In all cases of the PSs, a higher V OC was observed of about 0.1 V than that of a liquid electrolyte owing to a suppressed back electron charge transfer. In addition, the PS prepared by the polymer solution of 1 : 4 : 1 (BPPO : N ‐methyl‐2‐pyrrolidone : butyl alcohol) with the humidification process showed better photovoltaic properties in terms of the current density and conversion efficiency owing to the appropriate combinations of pore size, tortuosity, and interconnectivity. Effects of the pore structures were intensively examined using electrochemical impedance spectroscopy. The impedance results revealed that large pores at the surface layers are advantageous for a lower R S and R TiO2 . Meanwhile, the straight inner structure is beneficial for the facile I − /I 3 − diffusion, thus lowering R Pt . © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 39739.