摘要
采用恒压电化学沉积法将MnO_(2)纳米颗粒沉积在碳布(CC)表面,通过控制电化学沉积时间,制备不同MnO_(2)沉积量的MnO_(2)/碳布复合柔性电极。使用场发射扫描电子显微镜(FESEM)、X线衍射仪(XRD)分析不同电化学沉积时间的复合材料形貌和结构,同时采用电化学工作站对复合电极进行循环伏安(CV)、恒电化学流充放电(GCD)、交流阻抗等电化学性能测试。结果表明:碳布表面的结构和电化学沉积反应时间对MnO_(2)的生长形貌和包覆度有一定的影响,从而导致复合材料比电容的改变。MnO_(2)均匀分布于碳纤维上,形成致密的纳米片结构,当电化学沉积时间为1800 s时,电极的综合性能最佳,制得的MnO_(2)/碳布复合材料在1 A/g的电流密度下,质量比电容达到498.62 F/g。较低的内阻(2.94Ω)及电荷转移电阻(1.774Ω)形成了良好的导电通道,使电极可快速地进行氧化还原反应。复合电极合成方法简单,且比电容性能优异,在柔性超级电容器方面具有应用前景。
MnO_(2) nanoparticles were deposited on the surface of carbon cloths(CC)via constant pressure electrochemical deposition methods.By controlling the electrochemical deposition time,MnO_(2)/carbon cloth composite flexible electrodes with different MnO_(2) deposition were prepared.The morphology and structure of composite materials with different deposition time were analyzed by field emission scanning electron microscope(FESEM)and X-ray diffraction(XRD).Meanwhile,the electrochemical performance of cyclic voltammetry(CV),constant current charge and discharge(GCD),and AC impedance were tested on composite materials using electrochemical workstation.Results showed that the structure of the carbon cloth surface and the electrodeposition reaction time had a certain effect on the growth morphology and coverage of MnO_(2),which leaded to changes in the electrochemical properties of the composite.MnO_(2) was uniformly distributed on the carbon fiber,forming a dense nanosheet structure.When the electrochemical deposition time was 1800 s,the overall performance of the capacitor was the best.The obtained MnO_(2)/carbon cloth composite material had a mass specific capacitance of 498.62 F/g at a current density of 1 A/g.The low internal resistance(2.94Ω)and the charge transfer resistance(1.774Ω)formed a good conductive path,so that the electrode could quickly undergo redox reactions.The synthetic method of composite electrode is simple,and it has excellent specific capacitance performance in flexible supercapacitors.
作者
王瑶
么贺祥
俞娟
王晓东
黄培
WANG Yao;YAO Hexiang;YU Juan;WANG Xiaodong;HUANG Pei(State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211800, China)
出处
《南京工业大学学报（自然科学版）》
CAS
北大核心
2021年第6期739-745,共7页
Journal of Nanjing Tech University(Natural Science Edition)
关键词
二氧化锰
碳布
柔性电极
电化学沉积
循环伏安
manganese dioxide
carbon cloths
flexible electrode
electrochemical deposition
cyclic voltammetry
