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A transparent solid-state ion gel for supercapacitor device applications

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Abstract

A feasibility study of the synthesis of gel polymer electrolytes based in methyl methacrylate (MMA) and 1-vinyl-2-pyrrolidone (VP) using [HEMIm][BF4] as common ionic liquid has been done. A novel PVP/[HEMIm][BF4] solid-state and self-standing ion gel electrolyte has been successfully prepared. The thermal degradation of PVP/[HEMIm][BF4] ion gel occurs in two steps with the first one at above 200 °C and the main one over 390 °C. This solid-state ion gel is transparent, showing an optical transmittance with a maximum value of 90% in the visible wavelength region from 370 to 770 nm. The synthesized PVP/[HEMIm][BF4] solid-state ion gel exhibits an electrochemical stability window of ca. 5.0 V and an acceptable ionic conductivity of σ = 5.7 10−3 S cm−1 at room temperature. A symmetrical pseudocapacitive supercapacitor has been assembled and characterized using this PVP/[HEMIm][BF4] solid-state ion gel—glass/ITO/PEDOT/PVP/[HEMIm][BF4]/PEDOT/ITO/glass. It is found that the supercapacitor shows a typical areal specific capacitance of 3.1 mF cm−2, a maximum energy density of 2.5 μWh cm−2, and an areal specific power density of ca. 1 mW cm−2.

Squeme and cyclic voltammogram curves of the tested supercapacitor device

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Acknowledgements

This work was supported by the Ministry of Economy and Competitiveness with the research project TEC 2014-53906-R; and Junta de Andalucia through the project RNM1399. The authors are grateful to CSIC (Comisión Sectorial de Investigación Científica) of the Universidad de la República, in Montevideo, Uruguay, PEDECIBA – Física, ANII (Agencia Nacional de Investigación e Innovación), Uruguay.

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Authors and Affiliations

  1. Laboratorio de Materiales y Superficies (Unidad Asociada al CSIC). Departamentos de Física Aplicada & Ing. Química, Universidad de Málaga, E29071, Málaga, Spain

    Elena Navarrete-Astorga, Jorge Rodríguez-Moreno, José R. Ramos-Barrado & Francisco Martín

  2. Instituto de Física, Facultad de Ingeniería, Herrera y Reissig 565, C.C. 30, 11000, Montevideo, Uruguay

    Enrique A. Dalchiele

  3. Instituto de Química, Facultad de Ciencias, Pontificia Universidad Católica de Valparaíso, Casilla 4059, Valparaíso, Chile

    Ricardo Schrebler & Patricio Leyton

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  1. Elena Navarrete-Astorga
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Correspondence to Elena Navarrete-Astorga.

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Navarrete-Astorga, E., Rodríguez-Moreno, J., Dalchiele, E.A. et al. A transparent solid-state ion gel for supercapacitor device applications. J Solid State Electrochem 21, 1431–1444 (2017). https://doi.org/10.1007/s10008-016-3494-y

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