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Zeolite-templated nanoporous carbon for high-performance supercapacitors

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Abstract

Hierarchical porous carbon prepared with calcium-containing nanocrystalline beta zeolite as the template and ethylene as the carbon source at a relatively low carbonization temperature (600 °C) displayed excellent electrocapacitive properties. The presence of both micro/mesopores and surface oxygen-containing groups on the ordered porous structure, along with a high specific surface area (2280 m2 g−1) and pore volume (1.95 cm3 g−1) coupled with good wettability towards the electrolyte enabled the carbon to perform well as a supercapacitor electrode. This carbon electrode achieved a specific capacitance of 250 F g−1 at a current density of 1 A g−1 with 1 M H2SO4 as the aqueous electrolyte measured in a three-electrode system. A symmetric capacitor fabricated with the carbon as both electrodes exhibited a specific capacitance of 161 F g−1 at a current density of 1 A g−1, and an excellent cycling stability. After being cycled 17 000 times and shelved for another two months, the electrode exhibited a specific capacitance of 246 F g−1 at 1 A g−1, 153% of the initial capacitance, and still maintained an excellent cycle stability. Besides, an all-solid-state supercapacitor cell fabricated with this carbon as both electrodes and polyvinyl alcohol/H2SO4 gel as the electrolyte displayed an areal specific capacitance of 413 mF cm−2 at a current density of 0.25 mA cm−2.

Graphical abstract: Zeolite-templated nanoporous carbon for high-performance supercapacitors

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Publication details

The article was received on 26 Jan 2018, accepted on 28 Apr 2018 and first published on 30 Apr 2018


Article type: Paper
DOI: 10.1039/C8TA00850G
Citation: J. Mater. Chem. A, 2018, Advance Article
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    Zeolite-templated nanoporous carbon for high-performance supercapacitors

    H. Lu, K. Kim, Y. Kwon, X. Sun, R. Ryoo and X. S. Zhao, J. Mater. Chem. A, 2018, Advance Article , DOI: 10.1039/C8TA00850G

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