摘要
以葡萄糖为前驱体、柠檬酸镁为模板,先预碳化再结合KOH活化制备高性能多孔碳电极材料。通过扫描电子显微镜（SEM）研究掺杂柠檬酸镁前后样品的形貌结构,发现通过柠檬酸镁模板法制备的活性碳孔径分布更为均匀。通过氮气吸脱附测试发现,以柠檬酸镁为模板,活性碳的比表面积由135.6 m2/g提高到326.13 m2/g。电化学测试结果表明,以柠檬酸镁为模板,电极材料的双电层电容特性得到明显提高。在电流密度为0.5 A/g时,AC-Mg的比电容139.88 F/g远大于AC的比电容31 F/g;在10 A/g的电流密度下,AC比电容保持率为72.5%,AC-Mg比电容保持率增加到87%,电极材料的电阻从1.589Ω下降到1.021Ω,具有更好的导电性,在进行了5 000圈循环测试后,AC-Mg比电容保持率仍为96%。
The high performance porous carbon electrode materials were prepared by the pre-carbonization and KOH activation with glucose as the precursor and magnesium citrate as the template.The morphology structures of the samples before and after doping magnesium citrate were researched by the scanning electron microscope（SEM）.It is found that the pore size distribution of the activated carbon prepared by magnesium citrate template method is more uniform.Through the nitrogen absorption-desorption test,it is found that the specific surface area of the active carbon increases from135.6 m2/g to 326.13 m2/g with magnesium citrate as the template.The electrochemical test results show that the double layer capacitance characteristic of the electrode material is obviously improved with magnesium citrate as the template.When the current density is 0.5 A/g,the specific capacitance of AC-Mg is 139.88 F/g,which is much greater than the AC specific capacitance of 31 F/g.When the current density is 10 A/g,the specific capacitance retention rate of AC is 72.5% and that of AC-Mg increases to 87%.The resistance of the electrode material decreases from1.589Ωto 1.021Ω,showing the better conductivity.After the5 000 cycles test,the specific capacitance retention rate of AC-Mg is still 96%.
作者
高小转
杜青
李廷鱼
郭丽芳
李刚
Gao Xiaozhuan;Du Qing;Li Tingyu;Guo Lifang;Li Gang(Micro-Nano System Research Center, College of Information and Computer, Taiyuan University of Technology, Taiyuan 030024, Chin)
出处
《微纳电子技术》
北大核心
2018年第7期481-486,共6页
Micronanoelectronic Technology
基金
国家自然科学基金资助项目(61674113,51622507,61471255)
山西省自然科学基金资助项目(2014011019-1,20141001021-2,2016011040)
山西省回国留学人员科研项目(2013-036)
山西省人社厅留学人员择优资助项目([2013]251)
人社部留学人员择优资助项目([2014]240)
山西省高校科技创新研究项目(2016138)
关键词
葡萄糖
柠檬酸镁
KOH活化
电极材料
活性碳
glucose
magnesium citrate
KOH activation
electrode material
activated carbon
