The preparation and electrochemical properties of PEDOT:PSS/MnO₂/PEDOT ternary film and its application in flexible micro-supercapacitor

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• 作者：Yan Chen ; Jianhua Xu ; ^{jianhuaxu8023@126.com" class="auth_mail" title="E-mail the corresponding author} ; Yajie Yang ; Yuetao Zhao ; Wenyao Yang ; Xilin Mao ; Xin He ; Shibin Li
• 关键词：Ternary film ; Electrochemical property ; Synergistic effect ; Energy storage device
• 刊名：Electrochimica Acta
• 出版年：2016
• 出版时间：1 March 2016
• 年：2016
• 卷：193
• 期：Complete
• 页码：199-205
• 全文大小：2018 K

文摘

Micro-supercapacitors are promising energy storage devices that can complement batteries in miniaturized portable electronics and microelectromechanical systems. Here, we develop a facile method to fabricate a hierarchically structured film as electrode material of micro-supercapacitor. A poly (3,4-ethylenedioxythiophene):poly (styrenesulfonate)/manganese dioxide/poly (3,4-ethylenedioxythiophene) (PEDOT:PSS/MnO₂/PEDOT) ternary film is prepared via a two-step process. Firstly, MnO₂ nanoparticles are directly synthesized in the PEDOT:PSS matrix and the PEDOT:PSS/MnO₂ mixed solution is spin-coated on the substrate. Then a porous PEDOT film is synthesized by the vapor phase polymerization (VPP) on the PEDOT:PSS/MnO₂ precursor film. Electrochemical tests reveal that the ternary film exhibits a high specific capacitance of 391.36 F/cm³ at current density of 3.75 A/cm³, as well as excellent cycle stability with capacitance retention of 92% after 5500 cycles. The volumetric capacitance of PEDOT:PSS/MnO₂/PEDOT-microsupercapacitor achieves 13.64 F/cm³. The excellent electrochemical performances indicate that each component in the hybrid film provides unique and crucial function to achieve optimized electrochemical properties. As a result, this ternary composite film shows promising future as electrode material for electrochemical energy storage devices.