摘要
以杉木屑为原料,氯化锌和尿素为低共熔溶剂,炭活化后制备了氮掺杂活性炭,采用正交实验设计考察了浸渍比、活化温度和活化时间对活性炭电化学性能的影响。采用比表面积(BET)、X射线光电子能谱(XPS)、循环伏安、恒流充放电等表征手段研究了材料的孔隙结构和表面化学元素及电化学性能。研究结果表明:最佳工艺条件是浸渍比为4,活化温度为750℃,保温时间为3h。对活性炭的孔隙结构进行分析,可以发现低共熔溶剂活化后的活性炭有利于微孔的形成且比表面积可达到797.82m^(2)/g,氮含量为11.55%,其中氮元素化合态主要表现为吡啶型N、吡咯型N和石墨型N。在6mol/L的KOH电解液中,当电流密度1A/g时,可达233.85F/g的比电容,当电流密度增加到20A/g时,比电容依然能够维持在159.6F/g。
In this paper,nitrogen-doped activated carbon was prepared with Chinese fir sawdust as raw materials,and zinc chloride and urea as eutectic solvents after carbon activation.The influences of impregnation ratio,activation temperature and activation time on the electrochemical performance of activated carbon were investigated by orthogonal experiment design.Specific surface area(BET),X-ray photoelectron spectroscopy(XPS),cyclic voltammetry,galvanostatical charge/discharge(GCD)and other characterization methods were used to study the pore structure,surface chemical elements and electrochemical performance of sample.The study results showed that the impregnation ratio of 4,the activation temperature of 750℃and the holding time of 3h were the best process conditions.By analyzing the pore structure of activated carbon,it can be found that the activated carbon activated by eutectic solvent was beneficial to the formation of micropores and the specific surface area can reach 797.82m^(2)/g with nitrogen content of 11.55%,where the main combined states of nitrogen were pyridine type N,pyrrole type N and graphite type N.In the 6 mol/L KOH electrolyte,the specific capacitance can reach 233.85F/g when the current density was 1A/g.When the current density increased to 20A/g,the specific capacitance can still be maintained at 159.6F/g.
作者
何晨露
邱晨茜
方娟
杨旋
赖建军
郑新宇
吕建华
陈燕丹
黄彪
HE Chenlu;QIU Chenxi;FANG Juan;YANG Xuan;LAI Jianjun;ZHENG Xinyu;LYU Jianhua;CHEN Yandan;HUANG Biao(Materials Engineering College,Fujian Agriculture and Forestry University,Fuzhou 350002,Fujian,China;College of Life Sciences,Fujian Agriculture and Forestry University,Fuzhou 350002,Fujian,China)
出处
《化工进展》
EI
CAS
CSCD
北大核心
2022年第9期4946-4953,共8页
Chemical Industry and Engineering Progress
基金
国家自然科学基金(31770611,31870561)
福建农林大学国际科技合作与交流项目(KXGH17008)。
关键词
杉木屑
低共熔溶剂
氮掺杂活性炭
电化学
Chinese fir sawdust
eutectic solvent
nitrogen doped activated carbon
electrochemistry
