1. High-voltage aqueous symmetric supercapacitors based on 3D bicontinuous, highly wrinkled, N-doped porous graphene-like ultrathin carbon sheets.
- Author
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Tao, Boran, Zhang, Na, Ye, Tian, Gao, Pengfei, Li, Hongda, Xie, Yuanmiao, Liu, Jinghua, Wang, Guofu, Zhang, Wenfeng, and Chang, Haixin
- Subjects
SUPERCAPACITORS ,ENERGY density ,DOPED semiconductors ,ENERGY storage ,STOMATOPODA ,POWER density ,ELECTRIC capacity ,ACTIVATED carbon - Abstract
In this study, a facile pyrolysis process is utilized to convert a mantis shrimp shell into a 3D bicontinuous porous, highly wrinkled, nitrogen-doped, graphene-like ultrathin carbon sheet (3D BWGC). The 3D BWGC achieves a high surface area of 2300 m
2 g−1 and a pore volume of up to 1.63 cm3 g−1 . The specific capacitance of the 3D BWGC in 0.5 M H2 SO4 electrolyte is 370.9 F g−1 at a current density of 1 A g−1 and an operating voltage window of 1.1 V. By introducing Fe2+ , the operating voltage window of 3D BWGC symmetric supercapacitors can reach 1.8 V in a neutral electrolyte, and a specific capacitance of 317.2 F g−1 can be obtained at a current density of 0.5 A g−1 . Remarkably, the fabricated symmetric supercapacitors using 2 M MgSO4 + 0.05 M FeSO4 electrolyte demonstrated an energy density as high as 17.7 W h kg−1 at a power density of 180 W kg−1 . The assembled supercapacitors exhibit good cycling performance, maintaining an initial capacitance of 87.2% over 30 000 cycles. These excellent performances indicate the promising prospects of 3D BWGC in high-performance electrochemical energy storage. [ABSTRACT FROM AUTHOR]- Published
- 2022
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