碳点MnO_(2)修饰碳布复合电极的电容性能  

Capacitance Performance of Carbon Dot MnO_(2) Modified Carbon Cloth Composite Electrode

作　　者：张兵[1] 周秧 庞宁 童新[2] 熊大元[1,2] 徐少辉[2] 王连卫[2] Zhang Bing;Zhou Yang;Pang Ning;Tong Xin;Xiong Dayuan;Xu Shaohui;Wang Lianwei(Shanghai Key Laboratory of Multidimensional Information Processing,School of Communication and Electronic Engineering,School of Physics and Electronic Science,East China Normal University,Shanghai 200241,China;Key Laboratory of Polarized Materials and Devices of Ministry of Education,School of Physics and Electronic Science,East China Normal University,Shanghai 200241,China)

机构地区：[1]华东师范大学通信与电子工程学院上海市多维度信息处理重点实验室,上海200241 [2]华东师范大学物理与电子科学学院极化材料与器件教育部重点实验室,上海200241

出　　处：《微纳电子技术》2021年第7期571-577,632,共8页Micronanoelectronic Technology

基　　金：国家自然科学基金资助项目(61774060);上海市科学技术委员会资助项目(18DZ2270800)。

摘　　要：通过一种自下而上的高温裂解方法制成一种碳点(CD),并在此基础上以碳布(CC)为衬底合成了碳点修饰的二氧化锰(CD/MnO_(2))复合电极。对合成的CD/MnO_(2)/CC进行表征分析,发现生成的CD/MnO_(2)较均匀地生长在碳纤维上,高分辨率透射电子显微镜(HRTEM)下CD/MnO_(2)呈分层纳米片状。对CD/MnO_(2)/CC进行电化学测试,发现该复合电极在Na2SO4水溶液中展现出了极高的面积比容量(1 mV/s扫描速率下达1400 mF/cm^(2))和超长的循环寿命(4000次循环后电容保持率达87.2%)。最后将复合电极、聚乙烯醇(PVA)和Na2SO4导电凝胶组装成柔性对称超级电容器。结果表明超级电容器扩展了电位窗口,达到了-1~1 V,在30 mV/s的扫描速率下,面积比容量为401 mF/cm^(2)。在180°和90°的弯折下,面积比容量变化不大,展现了良好的弯曲耐受度。A kind of carbon dot(CD)was made by a bottom-up high-temperature pyrolysis me-thod,and on this basis,a carbon dot modified manganese dioxide(CD/MnO_(2))composite electrode was synthesized with carbon cloth(CC)as substrate.The synthesized CD/MnO_(2)/CC was characterized and analyzed.It is found that CD/MnO_(2)is uniformly grown on the carbon fiber,and the CD/MnO_(2)is in the shape of layered nano-sheet under the high-resolution transmission electron microscope(HRTEM).The electrochemical test of CD/MnO_(2)/CC shows that the composite electrode has extremely high area specific capacity(1400 mF/cm^(2)at a scanning rate of 1 mV/s)and ultralong cycle life(the capacitance retention rate reaches 87.2%after 4000 cycles)in Na2SO4 aqueous solution.Finally,the composite electrode,polyvinyl alcohol(PVA)and Na2SO4 conductive gel were assembled into a flexible symmetrical supercapacitor.The results show that the supercapacitor expands the potential window to-1~1 V.At a scanning rate of 30 mV/s,the area specific capacity is 401 mF/cm^(2).Under 180°and 90°bending,the area specific capacity doesn’t change much,showing good bending tolerance.

关 键 词：碳点(CD) 复合电极 碳布(CC) 凝胶电解质 柔性超级电容器 

分 类 号：TB383[一般工业技术—材料科学与工程] TB334