摘要
为开发高性能超级电容器电极材料,以溶剂热法合成无色金属有机框架化合物(MOFs)材料[Zn_(2)(C_(8)H_(4)O_(4))_(2)(C_(6)H_(12)N_(2))]·4 DMF·0.5 H_(2)O(简称ZDP)作为炭前驱体,采用一步碳化法制备无定型结构氮自掺杂多孔炭(ZDPC-750),并使用X射线衍射分析、拉曼光谱分析、扫描电子显微镜、透射电子显微镜、氮气吸附、X射线光电子能谱对ZDPC-750试样进行表征;选用浓度为6 mol/L的KOH溶液为电解液,通过恒电流充放电(GCD)、循环伏安(CV)、电化学阻抗谱(EIS)等方法测定ZDPC-750电极试样的电化学性能。结果表明:ZDPC-750呈包含微孔、介孔和大孔的分级结构,比表面积(BET法)高达1228 m^(2)/g,平均孔径为3.53 nm;当电流密度为1.0 A/g时,ZDPC-750电极的比电容高达175 F/g;当电流密度从1.0 A/g增加到10.0 A/g时,电容保持率为80.4%;即使在1 A/g下GCD循环5000次,电容保持率仍然高达94.74%。
In order to develop high-performance supercapacitor electrode materials,the colorless metal organic framework compounds(MOFs)material[Zn_(2)(C_(8)H_(4)O_(4))_(2)(C_(6)H_(12)N_(2))]·4 DMF·0.5 H_(2)O(referred to as ZDP)was synthesized by the solvothermal method as carbon precursor,and the one-step carbonization method was adopted to prepare the amorphous nitrogen self-doped porous carbon ZDPC-750.Then the ZDPC-750 samples were characterized by X-ray diffraction analysis,Raman spectroscopy,scanning electron microscopy,transmission electron microscopy,nitrogen adsorption,and X-ray photoelectron spectroscopy.And the electrochemical properties of ZDPC-750 electrode samples were determined by galvanostatic charge-discharge(GCD),cyclic voltammetry(CV)and electrochemical impedance spectroscopy(EIS)methods with the concentration of 6 mol/L KOH solution as electrolyte.The results showed that the ZDPC-750 had a hierarchical structure including micropores,mesopores and macropores,and its BET specific surface area was up to 1228 m^(2)/g,and the average pore size was 3.53 nm.Moreover,when the current density was 1.0 A/g,the specific capacitance of the ZDPC-750 electrode sample was up to 175 F/g.When the current density increased from 1.0 A/g to 10.0 A/g,its capacitance retention rate was 80.4%.Even if GCD was cycled 5000 times at 1 A/g,its capacitance retention rate was still as high as 94.74%.
作者
李帅
黄思赟
LI Shuai;HUANG Si-Yun(Department of Chemical Engineering,Guizhou Vocational Institute of Applied Technology,Fuquan 550500,China)
出处
《石化技术与应用》
CAS
2022年第3期153-159,共7页
Petrochemical Technology & Application
关键词
超级电容器
金属有机框架化合物
一步碳化法
氮自掺杂多孔炭
电化学性能
super capacitor
metal organic framework compounds
one-step carbonization method
nitrogen self-doped porous carbon
electrochemical performance
