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Comparative study of electrochemical capacitance of multi-walled carbon nanotubes before and after chopping

机译：斩波前后多壁碳纳米管电化学电容的比较研究

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摘要

In the work, short multi-walled carbon nanotubes (S-CNTs) were synthesized by chopping conventional μm-long multi-walled carbon nanotubes (L-CNTs) under ultrasonication in H_2SO_4/HNO_3 mixed acids. A comparative electrochemical investigation performed in 6 M KOH solution demonstrated that a specific capacitance (SC) of ca. 14.6μFcm~(-2) was delivered by the S-CNTs with the specific surface area (SSA) of 207 m~2 g~(-1), much larger than that of ca. 10.1 μFcm~(-2) for the L-CNTs with the SSA of 223 m~2 g~(-1), the reason for which was that S-CNTs with two open ends, due to good ion penetrability, provided more entrances for electrolyte ions to access the inner surface easily through their shorter inner pathway so as to enhance their SSA utilization and geometric SC. The surface structure disruption of S-CNTs, owing to ultrasonication and oxidation during chopping process, deteriorated their electronic conductivity and resulted in an inferior power property in contrast to L-CNTs.
机译：在这项工作中，通过在H_2SO_4 / HNO_3混合酸中进行超声处理，将常规的微米长的多壁碳纳米管（L-CNT）切碎，合成了短的多壁碳纳米管（S-CNT）。在6 M KOH溶液中进行的比较电化学研究表明，比电容（SC）为。 S-CNTs的比表面积（SSA）为207 m〜2 g〜（-1）的S-CNT传递了14.6μFcm〜（-2），比ca. SSA为223 m〜2 g〜（-1）的L-CNT的10.1μFcm〜（-2），原因是具有两个开放端的S-CNT由于离子渗透性好而提供了更多的入口电解质离子可以通过较短的内部路径轻松进入内表面，从而提高其SSA利用率和几何SC。与L-CNTs相比，S-CNTs的表面结构破坏是由于切碎过程中的超声和氧化作用，使它们的电子传导性恶化，并导致功率性能较差。

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  • 来源
    《Applied Surface Science》 |2010年第2期|p.440-445|共6页
  • 作者

    Changzhou Yuan; Laifa Shen; Diankai Li; Fang Zhang; Xiangjun Lu; Xiaogang Zhang;

  • 作者单位

    School of Materials Science & Engineering, Anhui University of Technology, No. 59 Hudong Street, Maanshan 243002, PR China;

    College of Material Science & Engineering, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, PR China;

    School of Materials Science & Engineering, Anhui University of Technology, No. 59 Hudong Street, Maanshan 243002, PR China;

    College of Material Science & Engineering, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, PR China;

    College of Material Science & Engineering, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, PR China;

    College of Material Science & Engineering, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, PR China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    multi-walled carbon nanotubes; electric double-layer capacitance; surface utilization; power property;

    机译：多壁碳纳米管;双电层电容;表面利用率权力属性;

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