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Thermal and electrochemical characterization of a new poly (ethylene oxide) copolymer—gel electrolyte containing polyvalent ion pair of cobalt (CoII/III) or iron (FeII/III)

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Abstract

In this work, gel polymer electrolytes based on the PEO copolymer—poly(ethylene oxide-co-2-(2-methoxyethoxy)ethyl glycidyl ether)), (P(EO-EM))—with a fixed P(EO-EM):GBL (γ-butyrolactone) weight ratio of 30–70% and different concentrations of redox mediators CoII:CoIII or FeII:FeIII were prepared as a possible substitute to the redox couple I−/I3 in dye-sensitized solar cell. The gel polymer electrolytes showed an increase in thermal stability with the addition of iron or cobalt salts. Maximum conductivity of 10−6 and 10−5 S cm−1, at room temperature, was observed for the system containing Co and Fe, respectively. Conductivity variation as a function of temperature showed Arrhenius type thermal activated process. Photoinduced absorption spectroscopy (PAS) tests showed the successful regeneration of the L0 dye by Gel+2 wt% FeII/III and Gel+5 wt% CoII/III. The Gel+2 wt% FeII/III electrolyte was also able to reduce the N719, D35, and Z907 dyes.

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Acknowledgments

The authors GASJ and AFN thank to FAPESP, CNPq, and INEO for financial support. We wish to express our thanks to Dra. Silmara Neves and Dra. Carla Maria Nascimento Polo da Fonseca for the EIS measurements and for their kind interest and encouragement. We are also very grateful to Dr. Anders Hagfeldt and Dr. Gerrit Boschlo for the PAS tests and valuable remarks which helped to improve the manuscript.

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  1. Laboratório de Nanotecnologia e Energia Solar (LNES), Chemistry Institute, University of Campinas, UNICAMP, PO Box 6154, Campinas, SP, 13083-970, Brazil

    Garbas Anacleto dos Santos Junior & Ana Flávia Nogueira

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Correspondence to Ana Flávia Nogueira.

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dos Santos Junior, G.A., Nogueira, A.F. Thermal and electrochemical characterization of a new poly (ethylene oxide) copolymer—gel electrolyte containing polyvalent ion pair of cobalt (CoII/III) or iron (FeII/III). J Solid State Electrochem 22, 1591–1605 (2018). https://doi.org/10.1007/s10008-018-3889-z

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  • DOI: https://doi.org/10.1007/s10008-018-3889-z

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