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首页> 外文会议>Nanostructured metal oxides for advanced applications >Nanoscale Blended MnO_2 Nanoparticles in Electro-polymerized Polypyrrole Conducting Polymer for Energy Storage in Supercapacitors
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Nanoscale Blended MnO_2 Nanoparticles in Electro-polymerized Polypyrrole Conducting Polymer for Energy Storage in Supercapacitors

机译：电聚合聚吡咯导电聚合物中的纳米级混合MnO_2纳米颗粒，用于超级电容器中的能量存储

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摘要

Polypyrrole (pPy) conducting polymer films embedded with MnO_2 nanoparticles have been synthesized by electrochemical polymerization and anodic oxidation processes. MnO_2 nanoparticles coexist in the hydrated Mn(Ⅱ) and Mn(Ⅳ) states and undergo valence state change along side pPy anion doping-dedoping contributing to the system pseudocapacitance. Increased density of sequestered MnO_2 nanoparticles in pPy significantly improves charge storage properties as shown by increased electrodic specific capacitance from 200 to 620 Fg~(-1) based on cyclic voltammetry studies. MnO_2 nanoparticle dispersion in open porous pPy microstructure is affected by current density in excess of 4 mA.cm~(-2) used in synthesis and results in MnO_2 particle agglomeration that excludes open surface access reducing specific capacitance. Charge-discharge studies show stable capacitance retention for ～1000 cycles. The redox performance of MnO_2-pPy composite electrodes is suitable for application in the high energy density supercapacitors.
机译：通过电化学聚合和阳极氧化工艺合成了嵌有MnO_2纳米粒子的聚吡咯（pPy）导电聚合物薄膜。 MnO_2纳米粒子共存于水合的Mn（Ⅱ）和Mn（Ⅳ）态，并沿着pPy阴离子的掺杂-去掺杂状态发生价态变化，从而导致系统的假电容。根据循环伏安法研究，pPy中螯合的MnO_2纳米颗粒的密度增加可显着改善电荷存储性能，这可通过将电极比电容从200 Fg〜（-1）增加到620 Fg〜（-1）来体现。 MnO_2纳米颗粒在开放的多孔pPy微观结构中的分散度受合成中使用的电流密度超过4 mA.cm〜（-2）的影响，导致MnO_2颗粒发生团聚，排除了开放的表面接触，从而降低了比电容。充放电研究表明，电容保持稳定〜1000个周期。 MnO_2-pPy复合电极的氧化还原性能适用于高能量密度超级电容器。

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  • 会议地点 San Francisco CA(US)
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    Navjot K. Sidhu; A.C. Rastogi;

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    Electrical and Computer Engineering Department, Binghamton University, State University of New York, Binghamton, NY 13902, U.S.A.,Center for Autonomous Solar Power (CASP), Binghamton University, State University of New York, Binghamton, NY 13902, U.S.A.;

    Electrical and Computer Engineering Department, Binghamton University, State University of New York, Binghamton, NY 13902, U.S.A.,Center for Autonomous Solar Power (CASP), Binghamton University, State University of New York, Binghamton, NY 13902, U.S.A.;

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