Abstract
Nanocellulose has become one of the most attractive matrix materials for flexible supercapacitors, owing to the high surface area, good mechanical properties and environmental friendliness. Herein, we developed electrode materials with high capacitance and mechanical flexibility through the in-situ synthesis of polypyrrole (PPy) in TEMPO-oxidized cellulose nanofibril (TOCN)/sulfonated carbon nanotubes (SCNT) composite hydrogels. The TOCN/SCNT/PPy composite hydrogels were thus obtained via a bifunctional Fe3+ in-situ oxidation, showing high specific capacitance of 5299 mF/cm2 at a current density of 1 mA/cm2. Furthermore, the assembled symmetric TOCN-40SCNT-PPy solid-state supercapacitor exhibited outstanding capacitance of 375 mF/cm2 and electrochemical stability with 163.2 % capacitance retention at a current density of 1 mA/cm2 for 2500 cycles. These nanocellulose/carbon nanotube/polypyrrole hydrogels are thus promising in the fields of flexible solid-state supercapacitor with superior electrochemical performance.
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Acknowledgments
The research was supported by the Hainan Provincial Joint Project of Sanya Yazhou Bay Science and Technology City (Grant No: 520LH017), and the Fundamental Research Funds for the Central Universities of China (WUT: 2020IB030).
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10570_2021_3998_MOESM1_ESM.docx
Further details on FT-IR spectra, XRD patterns, CV curves, Galvanostatic charge-discharge (GCD) curves, Nyquist impedance spectra based on TOCN-40SCNT and TOCN-50SCNT hydrogels. (docx 215kb)
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Zhan, Y., Hu, Y., Chen, Y. et al. In-situ synthesis of flexible nanocellulose/carbon nanotube/polypyrrole hydrogels for high-performance solid-state supercapacitors. Cellulose 28, 7097–7108 (2021). https://doi.org/10.1007/s10570-021-03998-1
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DOI: https://doi.org/10.1007/s10570-021-03998-1