Biowaste‐Derived Hierarchical Porous Carbon Nanosheets for Ultrahigh Power Density Supercapacitors

• DOI: 10.1002/cssc.201800202
• Publication Date: 2018-03-06T02:58:55Z
• Authors: Dengfeng Yu; Chong Chen; Gongyuan Zhao; Lei Sun; Baosheng Du; Hong Zhang; Zhuo Li; Ye Sun; Flemming Besenbacher; Miao Yu
• Keywords: Heteroatom; Power density; Carbon fibers; Specific surface area

Abstract Low‐cost activated carbons with high capacitive properties remain desirable for supercapacitor applications. Herein, a three‐dimensional scaffolding framework of porous carbon nanosheets (PCNSs) has been produced from typical biowaste, namely, ground cherry calyces, the specific composition and natural structures which have contributed to PCNSs having very large surface area 1612 m 2 g −1 , hierarchical pore size distribution, turbostratic structure degree graphitization, about 10 % oxygen nitrogen heteroatoms. A capacitance 350 F at 0.1 achieved in two‐electrode system 6 KOH; this value is among highest biomass‐derived materials. More inspiringly, energy density 22.8 Wh kg power 198.8 W can be obtained 1 aqueous solution Li SO 4 an ultrahigh 81.4 446.3 realized 1‐ethyl‐3‐methylimidazolium tetrafluoroborate electrolyte.