Template-free approach to fabricate uniformly N-doped hierarchical porous carbons from waste oil  

作　　者：Jin Lu Ting Song Yan Chen Suyun Xu Pinjing He Hua Zhang 

机构地区：[1]School of Environment and Architecture,University of Shanghai for Science and Technology,Shanghai,200093,China [2]Institute of Waste Treatment and Reclamation,Tongji University,Shanghai,200092,China [3]State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing,210008,China [4]University of Chinese Academy of Sciences,Beijing,100049,China

出　　处：《Waste Disposal and Sustainable Energy》2024年第4期473-486,共14页废弃物处置与可持续能源(英文)

基　　金：supported by the National Natural Science Foundation of China(No.52370144).

摘　　要：The rational pore structure and abundant surface functional groups of hierarchical porous carbons(HPCs)are important for their practical application in supercapacitors.The liquid linoleic acid and solid melamine were thoroughly mixed and subjected to carbonization under autogenic pressure at elevated temperatures(CAPET),followed by KOH activation,to produce uniformly N-doped HPCs.The structure and surface chemical properties are controlled by adjusting the N-doped ratio.This adjustment results in high conductivity,abundant ion-accessible surfaces,hierarchical porosity with appropriate micro-mesoporous channels,as well as the presence of N and O heteroatoms.The addition of melamine markedly increased the surface area to 3474.1 m^(2)g^(−1)and the mesopore volume proportion to 72.9%‒77.3%in the HPCs.The crystal structure and functional groups of the HPCs were revealed by X-ray diffractometer,Raman spectrometry,and X-ray photoelectron spectrometry,indicating that LA-HPCs-N0.5 is a promising electrode material for supercapacitors.This material presented excellent capacitance storage performance and cycling stability,with a specific capacitance of 430.2 F g^(−1)at 1 A g^(−1)in a 6 mol L^(−1)KOH electrolyte system,and the capacitance retention rate was 86.5%after 2000 cycles of charging and discharging at 10 A g^(−1).This study has successfully demonstrated that the template-free preparation of N-doped HPCs from waste oil is feasible,economical,and sustainable.

关 键 词：CARBONIZATION Electrochemical capacitors Hierarchical porous carbon(HPC) Nitrogen doping Waste oil 

分 类 号：TQ424[化学工程]