PPy-MoS_(2)多孔网络柔性电极的电化学行为动力学分析  

PPy-MoS_(2) porous network flexible electrodes:Kinetic analysis of electrochemical behavior

作　　者：田玉玉 刘静[1] 宋雪峰[1] 邱羽 赵丽萍 张鹏[1] 孙燕亭 高濂[1] TIAN Yuyu;LIU Jing;SONG Xuefeng;QIU Yu;ZHAO Liping;ZHANG Peng;SUN Yanting;GAO Lian(School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Department of Applied Physics,KTH-Royal Institute of Technology,Stockholm 10691,Sweden;College of Electronic Information Science,Fujian Jiangxia University,Fuzhou 350108,Fujian,China)

机构地区：[1]上海交通大学材料科学与工程学院,上海200240 [2]瑞典皇家理工学院应用物理系,斯德哥尔摩10691 [3]福建江夏学院电子信息科学学院,福建福州350108

出　　处：《储能科学与技术》2022年第4期1141-1148,共8页Energy Storage Science and Technology

基　　金：国家自然科学基金项目(51972210,51772190);国家自然科学基金国际(地区)合作交流项目(52111530187);国家市场监督管理总局科技计划项目(2021MK050)。

摘　　要：利用导电聚合物聚吡咯(Polypyrrole,PPy)与二维层状化合物MoS_(2)之间的互助复合被证实是制备多孔网络柔性电极的有效方法,通过调控制备条件可得到具有不同结构参数的自支撑电极。本工作通过深入解析电化学阻抗谱及循环伏安曲线(CV)对PPy-MoS_(2)多孔网络膜电极的电化学行为进行了详细的动力学分析,Trasatti分析方法被用来量化在储能过程中内表面和外表面的相对电荷储存量。结果表明,多孔网络柔性电极的体积比容量因厚度不同导致差异明显,而差异的本质源于不同厚度的柔性电极中储能反应的动力学控制差异。随着柔性电极厚度由5μm逐渐增加至60μm,其中的储能反应由表面控制主导逐渐转换为扩散控制主导,当表面控制与扩散控制同时存在且比例相当时,柔性电极表现出最高的体积比容量68 mA·h/cm^(3)(5 mV/s)。因此,在应用多孔网络自支撑膜为柔性电极材料时,为了获得最佳的储能效率,需全面优化柔性电极的结构参数以促进活性材料与电解质离子之间的相互作用。Combining the conducting polymer polypyrrole(PPy)with layered molybdenum disulfide(MoS2)has proved to be an effective strategy to obtain a porous network flexible electrode.Various self-standing flexible electrodes with different structural parameters can be synthesized by controlling the preparation conditions.In this study,kinetics of the electrochemical behavior of PPy-MoS2 electrodes were systematically investigated by analyzing electrochemical impedance spectroscopy and cyclic voltammetry(CV)curves.The Trasatti analysis method was adopted to quantify the charge stored at the inner and outer surfaces during energy storage.Results show that the volumetric capacity of the porous network flexible electrodes varies with thickness.The difference in volumetric capacity derives from the kinetic control on the energy storage reaction.The dominant control in that reaction changes from surface control to diffusion control as the thickness of the flexible electrode increases from 5 to 60μm.When surface control and diffusion control coexist at similar levels,the porous network flexible electrode yields its maximum capacity(68 mA·h/cm^(3) at 5 mV/s).Therefore,to maximize storage efficiency,the interaction between active materials and electrolyte ions should be carefully optimized when the porous network film is applied to a flexible electrode.

关 键 词：多孔网络柔性电极 动力学分析 表面控制 扩散控制 储能效率 

分 类 号：TM53[电气工程—电器]