Preparation of crab-shell-based N,O co-doped graded porous carbon for supercapacitors using the confined nanospace deposition  

作　　者：Yiming Li Zhihao Yu Mengyan Guo Ming Zhang Jian Xiong Yina Qiao Rui Zhang Xuebin Lu 

机构地区：[1]School of Environmental Science and Engineering,Tianjin University,Tianjin 30000,China [2]School of Ecology and Environment,Tibet University,Lhasa 850000,China [3]School of Environment and Safety Engineering,North University of China,Taiyuan 030051,China [4]School of Environmental and Municipal Engineering,Tianjin Chengjian University,Tianjin 300384,China

出　　处：《Waste Disposal and Sustainable Energy》2024年第2期173-183,共11页废弃物处置与可持续能源（英文）

基　　金：China Postdoctoral Science Foundation,2023M732589,Zhihao Yu;National Natural Science Foundation of China,22308253,Zhihao Yu,51908400,Rui Zhang,52066017,Xuebin Lu;Central Financial Support Special Funds for Local Universities(Tibet University),[2022]No.1,Xuebin Lu,[2023]No.1,Xuebin Lu;Tibet University Postgraduate High Level Talent Training Programme,2020-GSP-B017,Xuebin Lu;Key R&D Projects in Tibet Autonomous Region,XZ202101ZY0011G,Xuebin Lu,XZ202101ZY0012G,Xuebin Lu.

摘　　要：Biomass-based carbon materials with hierarchical porous structures have attracted attention for their ability to provide more channels and shorten ion transport paths.Here,we developed a simple method based on confined nanospace deposition.Dur-ing high-temperature treatment,the mesoporous silica layer wrapped around the outside of the crab shells acted as a closed nanospace and effectively suppressed the severe deformation of the crab shell structure by shrinking inward.The prepared carbon material has a layered porous structure with abundant and stable N and O co-doping(N 7.32%,O 3.69%).The specific capacitance of the three-electrode system was 134.3 F/g at a current density of 0.5 A/g in a 6 mol/L KOH electrolyte,and the assembled aqueous symmetric supercapacitors exhibited an excellent cycling stability of 98.81%even after 5000 cycles.

关 键 词：SUPERCAPACITOR Confined nanospace deposition Biomass-based carbon materials Crab shell 

分 类 号：TM53[电气工程—电器]