Abstract
Polyaniline (PANI) composite hydrogels with a combination of excellent mechanical and electrochemical properties are promising for the development of flexible wearable devices. Generally, the preparation of a PANI hydrogel requires two steps. Either the polyvinyl acetate (PVA) flexible network is first prepared, followed by the addition of aniline and initiator, or a PANI powder is prepared first and then dispersed in a polyvinyl alcohol solution to form a hydrogel through the freeze-thaw cycle. In this work, we report a simple and effective strategy to synthesize polyaniline nanocomposite hydrogels. A PANI hydrogel electrode with a specific flexibility and excellent electrochemical performance was fabricated in one step by utilizing the hydrogen bonding cross-linking effect between sucrose and PANI and PVA. The three-dimensional network PANI hydrogel capacitor obtained by physical cross-linking exhibited appreciable capacitance performance and excellent rate performance. When the current density was 1 mA/cm2, the specific areal capacitance of the device reached 500.2 mF/cm2. When the current density increased 10-fold, the capacitance retention rate was 55.1%. This research proposes a novel solution for designing and developing energy storage hydrogels with several potential applications such as artificial skin, motion detection, and wearable electronics.
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Acknowledgements
National Natural Science Foundation of China (51801065), Science and Technology Project of Guangdong Province (2015A030310488, 2014B090915003, and 2015B090901052), the Scientific Cultivation and Innovation Fund Project of Jinan University (21617427), and Guangdong Tobacco Monopoly Administration Science and Technology programs (No.2019011).
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Cao, L., Huang, S., Lai, F. et al. Sucrose in situ physically cross-linked of polyaniline and polyvinyl alcohol to prepare three-dimensional nanocomposite hydrogel with flexibility and high capacitance. Ionics 27, 3431–3441 (2021). https://doi.org/10.1007/s11581-021-04010-3
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DOI: https://doi.org/10.1007/s11581-021-04010-3