摘要
过渡金属氧化物作为超级电容器(SC)的电极材料具有较高的理论电容量,但存在比表面积小、导电率差、活性物质易团聚等问题,严重影响其电化学性能。通过一步氧化法成功制备了三维网络结构的三维石墨烯(3DG)/Mn_(3)O_(4)@碳纳米线复合材料,可以有效地解决过渡金属氧化物的上述问题。在电流密度0.5 A·g^(-1)下3DG/Mn_(3)O_(4)@碳纳米线的比电容高达259.1 F·g^(-1);在大电流密度5 A·g^(-1)下5000次循环后的比电容仍可高达120.1 F·g^(-1),比电容保持率为90.3%。结果表明,3DG/Mn_(3)O_(4)@碳纳米线复合材料为电极的超级电容器表现出优异的电化学性能。
As the electrode materials of supercapacitors(SCs),transition metal oxides have high theoretical capacitance,but have some problems,such as small specific surface area,poor conductivity and easy agglomeration of active substances,which seriously affect their electrochemical performances.Three-dimensional network structure grapheme(3 DG)/Mn_(3)O_(4)@carbon nanowires composites were successfully prepared by one-step oxidation method,effectively solving the above problems of transition metal oxides.The specific capacitance of the 3 DG/Mn_(3)O_(4)@carbon nanowires is as high as 259.1 F·g^(-1)at a current density of 0.5 A·g^(-1).The specific capacitance can still be as high as 120.1 F·g^(-1)after 5000 cycles at a large current density of 5 A·g^(-1),and the specific capacitance retention is 90.3%.The results show that the supercapacitor with 3 DG/Mn_(3)O_(4)@carbon nanowires composites as electrodes exhibits superior electrochemical performances.
作者
肖倩
朱燕艳
曹海静
蒋锋
方泽波
Xiao Qian;Zhu Yanyan;Cao Haijing;Jiang Feng;Fang Zebo(College of Mathematics and Physics,Shanghai University of Electric Power,Shanghai 200090,China;School of Mathematical Information,Shaoxing University,Shaoxing 312000,China)
出处
《微纳电子技术》
CAS
北大核心
2022年第11期1134-1139,共6页
Micronanoelectronic Technology
基金
国家自然科学基金资助项目(51672172,51872186,51971128,52171185)
上海市优秀学术/技术带头人计划资助项目(20XD1401800)
上海市科委项目(19020501000)
微机电系统浙江省工程研究中心开放课题基金资助项目(MEMSZJERC2205)
校企合作横向项目(H2021-271)。
