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Stretchable, self-healable, and reprocessable chemical cross-linked ionogels electrolytes based on gelatin for flexible supercapacitors

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Abstract

A novel chemical cross-linked ionogels with excellent self-healability, stretchability, and reprocessability based on gelatin have been synthesized via the Schiff base reaction in ionic liquid of 1-ethyl-3-methylimidazolium acetate (EMIMAc). Rheological measurements revealed that the plateaus modulus in storage modulus increases with increase in the content of gelatin. These ionogels displayed good thermal mechanical stability, and the chemical networks were not destroyed even at temperature up to 140 °C. High stretchability was obtained and the elongation at break for the as-prepared ionogel could even reach 368.6%. Importantly, the prepared ionogels showed excellent self-healability and reprocessability. Remarkably, the ionogels exhibited superior ionic conductivity and room temperature ionic conductivity was higher than 1.0 × 10−3 S/cm. Furthermore, supercapacitors with this ionogel electrolyte showed temperature-dependent specific capacitance and remarkable flexible performance. Therefore, the as-prepared self-healable and reprocessable ionogels from the nature of gelatin, with highly ionic conductivity and stretchability, could be considered an excellent electrolyte candidate for various next-generation stretchable electronics.

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Acknowledgements

The authors acknowledge the financial supports from the National Science Foundation of China (Grant Nos. 21304029, 21474026, 51425307), the Natural Science Foundation of Hebei Province (Grant No. B2017201019). The authors also acknowledge the financial supports by Open Research Fund of CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences.

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Authors and Affiliations

  1. College of Chemistry and Environmental Science, Hebei University, Baoding, 071002, Hebei Province, People’s Republic of China

    Jiahang Liu, Hongzan Song, Zihao Wang, Jianxin Zhang & Xinwu Ba

  2. CAS Key Laboratory of Engineering Plastics, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, People’s Republic of China

    Jun Zhang

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  1. Jiahang Liu
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Correspondence to Hongzan Song, Jun Zhang or Xinwu Ba.

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Liu, J., Song, H., Wang, Z. et al. Stretchable, self-healable, and reprocessable chemical cross-linked ionogels electrolytes based on gelatin for flexible supercapacitors. J Mater Sci 55, 3991–4004 (2020). https://doi.org/10.1007/s10853-019-04271-4

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