Zeolite-templated nanoporous carbon for high-performance supercapacitors. Issue 22 (23rd May 2018)

• Record Type: Journal Article
• Authors: Lu, Hao; Kim, Kyoungsoo; Kwon, Yonghyun; Sun, Xiaoming; Ryoo, Ryong; Zhao, X. S.
• Is Part Of: Journal of materials chemistry. Volume 6:Issue 22(2018)
• Page Start: 10388
• Page End: 10394
• Publication Date: 2018-05-23
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c8ta00850g
• Languages: English
• ISSNs: 2050-7488

Abstract

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. 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 m 2 g −1 ) and pore volume (1.95 cm 3 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 H2 SO4 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/H2 SO4 gel as the electrolyte displayed an areal specific capacitance of 413 mF cm −2 at a current density of 0.25 mA cm −2 .