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Redox Poly-Counterion Doped Conducting Polymers for Pseudocapacitive Energy Storage

机译：氧化还原聚抗抵抗掺杂导电聚合物，用于假壳能量储存

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摘要

Conducting polymers (CPs) have been widely studied for electrochemical energy storage. However, the dopants in CPs are often electrochemically inactive, introducing "dead-weight" to the materials. Moreover, commercial-level electrode materials with high mass loadings (e.g., 10 mg cm(-2)) often encounter the problems of inferior electrical and ionic conductivity. Here, a redox-active poly-counterion doping concept is proposed to improve the electrochemical performance of CPs with ultra-high mass loadings. As a study prototype, heptamolybdate anion (Mo7O246-) doped polypyrrole (PPy) is synthesized by electro-polymerization. A 2 mm thick PPy electrode with mass loading of approximate to 192 mg cm(-2)reaches a record-high areal capacitance of approximate to 47 F cm(-2), competitive gravimetric capacitance of 235 F g(-1), and volumetric capacitance of 235 F cm(-3). With poly-counterion doping, the dopants also undergo redox reactions during charge/discharge processes, providing additional capacitance to the electrode. The interaction between polymer chains and the poly-counterions enhances the electrical conductivity of CPs. Besides, the poly-counterions with large steric hindrance could act as structural pillars and endow CPs with open structures for facile ion transport. The concept proposed in this work enriches the electrochemistry of CPs and promotes their practical applications.
机译：已经广泛研究了电化学能量储存的导电聚合物（CPS）。然而，CPS中的掺杂剂通常是电化学无效的，将“死重”引入材料。此外，具有高质量载荷（例如> 10mgcm（-2））的商业水平电极材料经常遇到电气和离子电导率差的问题。在此，提出了一种氧化还原活性的聚逆掺杂概念，以改善具有超高批量载荷的CP的电化学性能。作为研究原型，通过电聚合合成庚烷变性阴离子（Mo7O246-）掺杂的聚吡咯（PPY）。具有大致近似约192mgcm（-2）的大规模负荷的2mm厚的PPY电极达到约47 f cm（-2）的记录高面积电容，竞争性重量电容为235 f g（-1），体积电容为235 f cm（-3）。通过聚逆掺杂，掺杂剂也经过氧化还原反应在充电/放电过程中，为电极提供额外的电容。聚合物链和聚抗距之间的相互作用增强了CP的电导率。此外，具有大型空间障碍的聚抗抵抗可以充当结构柱，具有用于容易离子传输的开放结构的结构柱和赋予CP。本作工作中提出的概念丰富了CP的电化学，并促进了其实际应用。

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  • 来源
    《Advanced Functional Materials》 |2021年第1期|2006203.1-2006203.10|共10页
  • 作者

    Zhang Ming-Yue; Song Yu; Yang Duo; Qin Zengming; Guo Di; Bian Li-Jun; Sang Xiao-Guang; Sun Xiaoqi; Liu Xiao-Xia;

  • 作者单位

    Northeastern Univ Dept Chem Shenyang 110819 Peoples R China;

    Northeastern Univ Dept Chem Shenyang 110819 Peoples R China;

    Northeastern Univ Dept Chem Shenyang 110819 Peoples R China;

    Northeastern Univ Dept Chem Shenyang 110819 Peoples R China;

    Northeastern Univ Dept Chem Shenyang 110819 Peoples R China;

    Northeastern Univ Dept Chem Shenyang 110819 Peoples R China;

    Northeastern Univ Dept Chem Shenyang 110819 Peoples R China;

    Northeastern Univ Dept Chem Shenyang 110819 Peoples R China;

    Northeastern Univ Dept Chem Shenyang 110819 Peoples R China|Northeastern Univ Minist Educ Key Lab Data Analyt & Optimizat Smart Ind Shenyang 110819 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    conducting polymers; high mass loading; permanent doping; redox dopants; supercapacitors;

    机译：导电聚合物;高质量负荷;永久掺杂;氧化还原掺杂剂;超级电容器;

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