Abstract
Reduced graphene oxide (RGO) hydrogel films possess a low specific capacitance and have no flexible current collectors, which limit their use in flexible supercapacitors. To solve these problems, a novel polyaniline (PANI) modified RGO hydrogel film with an attached graphite current collector (PANI/RGO/G) was prepared. Based on this film, a flexible supercapacitor device was fabricated and characterized. PANI/RGO/G film demonstrates good flexibility and electron transport. The graphite current collector highly reduces the internal resistance of the device. It shows a high specific capacitance of 478 F g−1 at a current density of 2 mA cm−2 based on the mass of one electrode and a good cycling stability (86.5% retention after 5000 cycles). Moreover, during the fabrication of the device, a modified design was adopted to solve the problem of low extension of PANI/RGO/G hydrogel film. The obtained device also exhibits a good flexibility; its capacitance hardly changes after 500 cycles of bending at an angle of 90°.
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Acknowledgements
This work was mainly supported by the Ministry of Education, Youth, and Sports of the Czech Republic (Project No. LTACH17015), NPU Program I (LO1504) and Operational Program Research and Development for Innovations co-funded by the European Regional Development Fund (ERDF) and national budget of the Czech Republic, within the framework of the CPS—strengthening research capacity (Reg. Number: CZ.1.05/2.1.00/19.0409). First author is thankful for Internal Grant Agency (IGA/CPS/2015/008 and IGA/CPS/2016/003) for the financial support received from Tomas Bata University in Zlin, Czech Republic. Authors are also thankful for the partial support of Shanghai Municipality Research Project (15520720500).
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Fei, H., Saha, N., Kazantseva, N. et al. Polyaniline/reduced graphene oxide hydrogel film with attached graphite current collector for flexible supercapacitors. J Mater Sci: Mater Electron 29, 3025–3034 (2018). https://doi.org/10.1007/s10854-017-8233-3
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DOI: https://doi.org/10.1007/s10854-017-8233-3