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Three dimensional carbon-bubble foams with hierarchical pores for ultra-long cycling life supercapacitors

机译：具有用于超长循环寿命超级电容器的三维碳泡泡泡沫

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摘要

Design and synthesis of integrated, interconnected porous structures are critical to the development of high-performance supercapacitors. We develop a novel and facile synthesis technic to construct three-dimensional carbon-bubble foams with hierarchical pores geometry. The carbon-bubble foams are fabricated by conformally coating, via catalytic decomposition of ethanol, a layer of carbon coating onto the surfaces of pre-formed ZnO foams and then the removal of the ZnO template by a reduction-evaporation process. Both the wall thickness and the pore size can be well tuned by adjusting the catalytic decomposition time and temperature. The as-synthesized carbon-bubble foams electrode retains 90.3% of the initial capacitance even after 70 000 continuous cycles under a high current density of 20 A g(-1), demonstrating excellent long-time electrochemical and cycling stability. The symmetric device displays rate capability retention of 81.8% with the current density increasing from 0.4 to 20 A g(-1). These achieved electrochemical performances originate from the unique structural design of the carbon-bubble foams, which provide not only abundant transport channels for electron and ion but also high active surface area accessible by the electrolyte ions.
机译：集成的设计和合成，相互连接的多孔结构对高性能超级电容器的开发至关重要。我们开发了一种新颖的和容易的合成技术，构建具有等级孔几何形状的三维碳泡沫泡沫。通过将乙醇的催化分解，通过催化分解在预形成的ZnO泡沫的表面上，通过催化分解，通过还原蒸发过程中除去ZnO模板的碳涂层的碳涂层层，然后通过还原蒸发方法去除ZnO模板来制造碳 - 泡沫泡沫。通过调节催化分解时间和温度，可以通过调节催化分解时间和温度来调节壁厚和孔径。即使在高电流密度为20Ag（-1）的高电流密度下，也合成的碳 - 泡沫泡沫泡沫电极也保持90.3％的初始电容。展示优异的长期电化学和循环稳定性。对称装置显示速率能力保持81.8％，电流密度从0.4〜20 a g（-1）增加。这些实现的电化学性能源自碳泡沫泡沫的独特结构设计，其不仅提供了电子和离子的丰富式传输通道，而且提供了电解质离子的高活性表面积。

著录项

  • 来源
    《Nanotechnology》 |2018年第27期|共11页
  • 作者

    Wang Bowen; Zhang Weigang; Wang Lei; Wei Jiake; Bai Xuedong; Liu Jingyue; Zhang Guanhua; Duan Huigao;

  • 作者单位

    Hunan Univ Coll Mech &

    Vehicle Engn State Key Lab Adv Design &

    Mfg Vehicle Body Changsha 410082 Hunan Peoples R China;

    Hunan Univ Coll Mech &

    Vehicle Engn State Key Lab Adv Design &

    Mfg Vehicle Body Changsha 410082 Hunan Peoples R China;

    Hunan Univ Coll Mech &

    Vehicle Engn State Key Lab Adv Design &

    Mfg Vehicle Body Changsha 410082 Hunan Peoples R China;

    Chinese Acad Sci Beijing Natl Lab Condensed Matter Phys Inst Phys Beijing 100190 Peoples R China;

    Chinese Acad Sci Beijing Natl Lab Condensed Matter Phys Inst Phys Beijing 100190 Peoples R China;

    Arizona State Univ Dept Phys Tempe AZ 85287 USA;

    Hunan Univ Coll Mech &

    Vehicle Engn State Key Lab Adv Design &

    Mfg Vehicle Body Changsha 410082 Hunan Peoples R China;

    Hunan Univ Coll Mech &

    Vehicle Engn State Key Lab Adv Design &

    Mfg Vehicle Body Changsha 410082 Hunan Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 特种结构材料;
  • 关键词

    ZnO template; catalytic conversion; carbon-bubble foams; supercapacitors; hierarchical pores;

    机译：ZnO模板;催化转化;碳泡沫泡沫;超级电容器;等级毛孔;

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