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B, N-dual doped sisal-based multiscale porous carbon for high-rate supercapacitors

机译：B，N-Dual掺杂Sisal基金的多尺度多孔碳，用于高速超级电容器

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摘要

B, N dual-doped sisal-based activated carbon (BN-SAC) with a multiscale porous structure for high-rate supercapacitor electrode was prepared through a novel and facile strategy. With the inherent cellular channels serving as primary macropores, secondary mesopores and micropores are generated on the fiber surface and tracheid walls through low-pressure rapid carbonization of (NH4)(2)B4O7-containing sisal fibers and successive KOH activation. In addition to introducing B, N atoms into the BN-SAC, the additive also facilitates the formation of mesopores due to the rapid gas evaporation during its decomposition, leading to significantly increased specific surface area (2017 m(2) g(-1)) and mesoporosity (68.6%). As a result, the BN-SAC-3 shows highly enhanced electrochemical performance including a high specific capacitance of 304 F g(-1), excellent rate capability (with 72.6% retention at 60 A g(-1)) and superior cycling stability (4.6% capacitance loss after 3000 cycles). After assembling the BN-SAC-3 into symmetric supercapacitor, it shows a specific capacitance of 258 F g(-1) at 1 A g(-1) with 76.4% retention at 40 A g(-1) in 6 M KOH electrolyte, and delivers a maximum energy density of 24.3 W h kg(-1) at a power density of 612.8 W kg(-1) in 1 M TEABF(4)/AN electrolyte. This work provides a new strategy for the synthesis of multiscale porous ACs for high-performance supercapacitors or other energy storage and conversion devices and is expected to be applied on other biomasses for large-scale production.
机译：B，通过新颖的和容易的策略制备具有用于高速超电极电极的多尺度多孔结构的N双掺杂的基于Sisal的活性炭（BN-SAC）。利用用作原发性大麦孔的固有细胞通道，通过低压快速碳化在纤维表面和含有含有NH 4）（2）B4O7的Sisal纤维的低压快速碳化和连续的KOH活化的纤维表面和胎管壁上产生次级孔孔和微孔。除了将B，N原子引入Bn-SAC之外，添加剂还促进了由于其分解过程中的气体蒸发而形成的中孔的形成，导致比表面积显着增加（2017 m（2）g（-1） ）和中渗透性（68.6％）。结果，BN-SAC-3显示了高度增强的电化学性能，包括304f g（-1）的高比电容，优异的速率能力（在60 a g（-1）的72.6％的保留）和优异的循环稳定性（3000个循环后的4.6％电容损耗）。在将BN-SAC-3组装成对称的超级电容器之后，它在6M koh电解质中以40Ag（-1）的76.4％保持在1Ag（-1）的比例为258fg（-1）的比电容并且在1M TeaBF（4）/电解质中，以612.8W kg（-1）的功率密度提供24.3WH kg（-1）的最大能量密度。这项工作为合成多尺度多孔ACS的高性能超级电容器或其他能量储存和转换装置提供了新的策略，并且预计将应用于其他生物量以进行大规模生产。

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  • 来源
    《RSC Advances》 |2019年第3期|共11页
  • 作者

    Wu Heng; Yuan Wenyu; Zhao Yingxin; Han Daoyang; Yuan Xiaowen; Cheng Laifei;

  • 作者单位

    Northwestern Polytech Univ Xian Shaanxi Peoples R China;

    Northwestern Polytech Univ Xian Shaanxi Peoples R China;

    Northwestern Polytech Univ Xian Shaanxi Peoples R China;

    Northwestern Polytech Univ Xian Shaanxi Peoples R China;

    Massey Univ Palmerston North New Zealand;

    Northwestern Polytech Univ Xian Shaanxi Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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