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Biowaste‐Derived Hierarchical Porous Carbon Nanosheets for Ultrahigh Power Density Supercapacitors
Author(s) -
Yu Dengfeng,
Chen Chong,
Zhao Gongyuan,
Sun Lei,
Du Baosheng,
Zhang Hong,
Li Zhuo,
Sun Ye,
Besenbacher Flemming,
Yu Miao
Publication year - 2018
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201800202
Subject(s) - supercapacitor , heteroatom , power density , carbon fibers , materials science , capacitance , specific surface area , chemical engineering , electrolyte , porosity , electrode , chemistry , organic chemistry , composite material , power (physics) , catalysis , alkyl , thermodynamics , composite number , engineering , physics
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 a typical biowaste, namely, ground cherry calyces, the specific composition and natural structures of which have contributed to the PCNSs having a very large specific surface area of 1612 m 2 g −1 , a hierarchical pore size distribution, a turbostratic carbon structure with a high degree graphitization, and about 10 % oxygen and nitrogen heteroatoms. A high specific capacitance of 350 F g −1 at 0.1 A g −1 has been achieved in a two‐electrode system with 6 m KOH; this value is among the highest specific capacitance of biomass‐derived carbon materials. More inspiringly, a high energy density of 22.8 Wh kg −1 at a power density of 198.8 W kg −1 can be obtained with 1 m aqueous solution of Li 2 SO 4 , and an ultrahigh energy density of 81.4 Wh kg −1 at a power density of 446.3 W kg −1 is realized with 1‐ethyl‐3‐methylimidazolium tetrafluoroborate electrolyte.