摘要
综述了近年国内外碳纳米管电极改性方法的最新研究进展,包括表面修饰、掺杂及改变CNTs的形状等。通过丰富CNTs表面的官能团,产生可使其他离子通过的壁缺陷及扩大CNTs层间距离,削减钠离子运动阻力等方法,提高超级电容器的储能能力及循环稳定性。值得注意的是,碳纳米管电极材料虽然可以提高超级电容器的电容,有巨大的应用前景,但在循环过程中,碳纳米管电极的纳米结构会随着电容器的工作而丢失,不利于电极材料的稳定性。通过将电极材料封装在不同类型的基体或涂层中可以很好地解决电极材料稳定性差的问题,这方面仍有较大的研究前景。
With the rapid development of portable and miniaturized electronic equipment,more and more high efficiency capacitors which can work under various complicated conditions are required.Therefore,the development of supercapacitors has gradually become the hot spot in the field of energy research.Different electrode materials with different specific surface area,pore size and other features,will have a great impact on the capacitance of supercapacitors.At present,the electrode materials of supercapacitors mainly include carbon materials,metal oxides and conductive polymers.The electrode materials made of carbon nanotubes(CNTs)have attracted much attention due to their high stability,rich microstructure,morphology,and low cost.In this paper,the latest research progress in the modification of CNTs electrode in recent years is reviewed,including surface modification,doping and changing the shape of CNTs.The energy storage capacity and cycling stability of ultracapacitors are improved by enriching functional groups on the surface of CNTs,generating wall defects that allow other ions to pass through CNTs,expanding the distance between CNTs layers,and reducing the motion resistance of sodium ions.It is worth noting that although carbon nanotube electrode materials can improve the capacitance of supercapacitors and have a great application prospect,the nanostructure of carbon nanotube electrodes will be lost along with the work of capacitors in the cycling process,which is not conducive to the stability of electrode materials.The problem of poor stability of electrode materials can be solved by encapsulating electrode materials in different kinds of substrate or coating,which still has a great research prospect.
作者
贾冬晴
尚蒙娅
孙浩炯
彭进
程文喜
Jia Dong-qing;Shang Meng-ya;Sun Hao-jiong;Peng Jin;Cheng Wen-xi(School of Material Science&Engineering of Henan University of Technology,Henan Zhengzhou 450001,China)
出处
《炭素技术》
CAS
北大核心
2021年第6期8-14,共7页
Carbon Techniques
基金
河南工业大学高层次人才科研启动基金项目(2019BS010)
河南工业大学创新基金支持计划专项项目(2020ZKCJ07)
2021年大学生创新创业训练计划项目(202110463001)。
关键词
超级电容器
电极材料
碳纳米管
改性
Supercapacitor
electrode materials
carbon nanotubes
modification
