Biomass-Derived Nitrogen and Sulfur Co-Doped 3D Carbon Networks with Interconnected Meso-Microporous Structure for High-Performance Supercapacitors  

作　　者：Zhu Jiajia Hao Xiaodong Wang Jie Guo Hongshuai Dou Hui Zhang Xiaogang 

机构地区：[1]Jiangsu Key Laboratory of Electrochemical Energy Storage Technologies,College of Material Science and Engineering,Nanjing University of Aeronautics and Astronautics

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2018年第4期590-602,共13页南京航空航天大学学报（英文版）

基　　金：supported by the National Basic Research Program of China(973 Program)(No.2014CB239701);the National Natural Science Foundation of China(Nos.51672128,51372116,21773118);the Natural Science Foundation of Jiangsu Province(Nos.BK20150739,BK20151468);the Prospective Joint Research Project of Cooperative Innovation Fund of Jiangsu Province(No.BY2015003-7);the Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)

摘　　要：Three-dimensional(3D)carbon networks have been explored as promising capacitive materials thanks to their unique structural features such as large ion-accessible surface area and interconnected porous networks,thus enhancing both ions and electrons transport.Here,sustainable bacterial cellulose(BC)is used both precursor and template for facile synthesis of free-standing N,S-codoped 3Dcarbon networks(a-NSC)by the pyrolysis and activation of polyrhodanine coated BC.The synthesized a-NSC shows highly conductive interconnected porous networks(24S·cm^(-1)),large surface area(1 420m^2·g^(-1))with hierarchical meso-microporosity,and high-level heteroatoms codoping(N:3.1%in atom,S:3.2%in atom).Benefitting from these,a-NSC as binder-free electrode exhibits an ultrahigh specific capacitance of 340F·g^(-1)(24μF·cm^(-2))at the current density of 0.5A·g^(-1)in 6MKOH electrolyte,high-rate capability(71%at 20A·g^(-1))and excellent cycle stability.Furthermore,the assembled symmetrical supercapacitor displays a much short time constant of 0.35sin 1MTEABF4/AN electrolyte,obtaining a maximum energy density of 32.1W·h·kg^(-1 )at power density of 637W·kg^(-1).The in situ multi-heteroatoms doping enables biocellulose-derived carbon networks to exploit its full potentials in energy storage applications,which can be extended to other dimensional carbon nanostructures.Three-dimensional （3D） carbon networks have been explored as promising capacitive materials thanks to their unique structural features such as large ion-accessible surface area and interconnected porous networks, thus enhancing both ions and electrons transport. Here, sustainable bacterial cellulose （BC） is used both precursor and template for facile synthesis of free-standing N, S-codoped 3D carbon networks （a-NSC） by the pyrolysis and activation of polyrhodanine coated BC. The synthesized a-NSC shows highly conductive interconnected porous networks （24 S·cm -1 ）, large surface area （1 420 m 2·g -1 ） with hierarchical meso-microporosity, and high-level heteroatoms codoping （N： 3.1 % in atom, S： 3.2 % in atom）. Benefitting from these, a-NSC as binder-free electrode exhibits an ultrahigh specific capacitance of 340 F·g -1 （24 μF·cm -2 ） at the current density of 0.5 A·g -1 in 6 M KOH electrolyte , high-rate capability （71% at 20 A·g -1 ） and excellent cycle stability. Furthermore, the assembled symmetrical supercapacitor displays a much short time constant of 0.35 s in 1 M TEABF 4/AN electrolyte, obtaining a maximum energy density of 32.1 W·h·kg -1 at power density of 637 W·kg -1 . The in situ multi-heteroatoms doping enables biocellulose-derived carbon networks to exploit its full potentials in energy storage applications, which can be extended to other dimensional carbon nanostructures.

关 键 词：bacterial cellulose 3D carbon networks FREE-STANDING N S-codoping SUPERCAPACITORS 

分 类 号：O616[理学—无机化学]