Journal
ENERGY & FUELS
Volume 36, Issue 4, Pages 2171-2178Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.energyfuels.1c03966
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Funding
- Fundamental Research Funds for Central Universities [2021RC251]
- National Natural Science Foundation of China [11872086]
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In this study, high-performance structural supercapacitors were prepared by coating carbon fibers with activated carbon to increase specific capacitance while maintaining tensile properties. This method provides a facile route for large-scale production and engineering application.
With the rapid consumption of fossil fuels and the massive emission of pollutants, multifunctional materials are the upgrading trend of automotive and aerospace structures. As a promising structural energy storage device, the specific capacitance of a carbon-fiber-based structural supercapacitor is greatly limited as a result of the low specific surface area of carbon fiber electrodes. In this work, we prepared high-performance structural supercapacitors that consisted of in situ and ex situ activated carbon (AC)-coated carbon fiber electrodes, glass fiber separator, and bicontinuous structural electrolyte. The specific capacitances of the structural supercapacitors increased from 8.67 x 10(-3) to 13.12 F/g after the coating of AC, while the tensile properties were basically maintained, which were much higher than the results of the state-of-art performance for structural supercapacitors. The tensile strength and modulus were 257.78 MPa and 23.20 GPa, respectively, as the mass fraction of AC increased to 15%. A total of 95% of the capacitance could be maintained in structural supercapacitor devices with a larger size of 15 x 15 cm, showing promising engineering prospects of AC-coated structural supercapacitors. The method in this work provided a facile route for realizing the large-scale production and engineering application of high-performance structural supercapacitors.
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