摘要
将玉米淀粉与尿素按不同比例混合糊化,经过500℃碳化、700℃KOH活化得到了氮掺杂的淀粉基活性炭.使用SEM和XPS对材料进行表征,并使用三电极系统和二电极系统对材料的电化学性能进行测试.结构形貌研究结果表明:制备的碳材料呈现不规则片状结构,氮掺杂提高了活性炭的氮含量.电化学测试结果表明:氮掺杂使制备的活性炭电极材料的比电容明显提高,其中淀粉和尿素质量比为1∶1时材料的电化学性能最佳;循环伏安曲线呈类矩形,表明电极材料具有双电层电容特性;三电极系统在0.5 A/g的电流密度下,材料比电容达293 F/g,在10 A/g下仍可高达203 F/g,表明电极材料具有良好的倍率性能;二电极系统在0.5 A/g的电流密度下,材料比电容为174 F/g,在2 A/g的电流密度下经过8000次充放电循环后,仍然可保持初始值85%的比电容.
Starch based activated carbon was prepared by mixed corn starch with urea at different proportions,carbonized at 500℃and activated at 700℃by KOH.The morphology and structure of materials characterized by Scanning electron microscopy(SEM)and X-ray photoelectron spectroscopy(XPS),and the electrochemical property was tested in both three-electrode system and two-electrode system.The characterization results show that the carbon material presents irregular sheet structure,and nitrogen atoms form a nitrogen-containing functional group after entering the carbon skeleton.The electrochemical test show that the addition of nitrogen atoms increased the specific capacity,When the mass ratio of starch to urea is 1∶1,the electrochemical properties of the prepared carbon materials are the best.Cyclic voltammetry curves are rectangular show the carbon material has double-layer capacitance characteristics.At a current density of 0.5 A/g,the material specific capacitance of the three electrode system reaches 293 F/g,and can still reach as high as 203 F/g at 10 A/g,indicating that the electrode material has good rate performance.At a current density of 0.5 A/g,the material specific capacitance of the two electrode system is 174 F/g.After 8000 charge and discharge cycles at a current density of 2 A/g,it can still maintain an initial specific capacitance of 85%.
作者
姜孟芳
徐立环
孙曼
杨帆
温美惠
苏畅
JIANG Mengfang;XU Lihuan;SUN Man;YANG Fan;WEN Meihui;SU Chang(Shenyang University of Chemical Technology,Shenyang 110142,China)
出处
《沈阳化工大学学报》
2024年第6期542-553,共12页
Journal of Shenyang University of Chemical Technology
基金
辽宁省高校创新人才支持计划项目(LR2017034)
辽宁省教育厅项目(LQ2017010)。
