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N‐doping Hierarchical Porosity Carbon from Biowaste for High‐Rate Supercapacitive Application
Author(s) -
Zhao Xuan,
Li Chen,
Zhang Xiong,
Sun Xianzhong,
Wang Kai,
Huang Xiaobin,
Ma Yanwei
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201701405
Subject(s) - supercapacitor , materials science , x ray photoelectron spectroscopy , raman spectroscopy , specific surface area , chemical engineering , scanning electron microscope , transmission electron microscopy , carbon fibers , electrochemistry , porosity , capacitance , analytical chemistry (journal) , nanotechnology , electrode , chemistry , composite material , composite number , organic chemistry , optics , physics , engineering , catalysis
In this work, nitrogen‐doped carbon materials with hierarchical porosity were prepared from biowaste of soybean curd residue (SCR) by KOH activation. The morphology, structure and textural properties of the carbon materials are investigated by scanning electron microscopy, transmission electron microscopy, X‐ray photoelectron spectroscopy, X‐ray diffraction, Raman spectroscopy, and N 2 absorption‐desorption isotherms, respectively. The products exhibit high specific surface area of 3431 m 2 g −1 , high nitrogen doping level, outstanding charge storage capacity of 282 F g −1 at the current density of 0.5 A g −1 and good electrochemical stability over 10000 cycles. Moreover, it still retains 200 F g −1 (71 % of its capacitance at 0.5 A g −1 ) at 20 A g −1 . The findings pave the way for improving charge storage capacity of supercapacitors based on activated carbon and provide a new method to transfer biowaste to effective electrode material.