Abstract
Self-organized porous sheet-like assemblies have attracted extensive attention for the development of flexible high-performance electrodes. This work demonstrates the facile synthesis and effects of reduction time on the electrochemical performance of porous sheet-like assemblies of reduced graphene oxide (rGO) on carbon cloth. An rGO porous assembly with a reduction time of 4 h exhibited a superior specific capacitance of 456 F/g at a scan rate of 5 mV/s and 223 F/g at a current density of 1 mA/cm2, with ~ 93.9% initial capacity retention over 2000 cycles. A solid-state symmetric supercapacitor device constructed of a rGO4//rGO4 porous assembly achieved a specific capacitance of 45.86 F/g at a scan rate of 5 mV/s and yielded an energy density of 1.27 Wh/kg and specific power of 833.3 W/kg in a PVA-H2SO4 gel polymer electrolyte. Furthermore, the flexible solid-state symmetric device provides outstanding cyclic stability with a 95.3% retention of its initial capacity over 2000 cycles. Thus, electrodes constructed of rGO porous sheets show great potential for flexible and transparent solid-state symmetric energy storage devices.
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Change history
17 May 2021
This article was updated due to Fig. 5 FE-SEM images of RGO were published wrongly in PDF version
Abbreviations
- GO:
-
Graphene oxide
- rGO:
-
Reduced graphene oxide
- CVD:
-
Chemical vapor deposition
- CMG:
-
Chemical modification of graphene
- CC:
-
Carbon cloth
- XRD:
-
X-ray diffractometry
- FE-SEM:
-
Field-emission scanning electron microscopy
- TEM:
-
Transmission electron microscopy
- XPS:
-
X-ray photoelectron spectroscopy
- BET:
-
Brunauer–Emmett–Teller
- V:
-
Cyclic voltammetry
- SCE:
-
Saturated calomel electrode
- GCD:
-
Galvanostatic charge–discharge
- SAED:
-
Selected area electron diffraction
- BJH:
-
Barret–Joyner–Halenda
- EIS:
-
Electrochemical impedance spectroscopy
- FSS:
-
Flexible solid-state symmetric
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Acknowledgements
This study was supported by the National Research Foundation of Korea (NRF-2020R1A2C1015206, NRF-2019M3F5A1A01077146, and NRF-2017M1A2A2048904). S.L.K. Would like thank to the Council of Scientific and Industrial Research, India for providing senior research fellowship CSIR-SRF Award No.: 09/877(100)2K18.
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Kadam, S.L., Mane, S.M., Ingole, R.S. et al. Time-intended effect on electrochemical performance of hydrothermally reduced graphene oxide nanosheets: Design and study of solid-state symmetric supercapacitor. J Mater Sci: Mater Electron 32, 14901–14918 (2021). https://doi.org/10.1007/s10854-021-06042-x
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DOI: https://doi.org/10.1007/s10854-021-06042-x