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首页> 外文期刊>Journal of power sources >Nitrogen-doped two-dimensional porous carbon sheets derived from clover biomass for high performance supercapacitors
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Nitrogen-doped two-dimensional porous carbon sheets derived from clover biomass for high performance supercapacitors

机译：来自三叶草生物质的氮掺杂二维多孔碳薄板，用于高性能超级电容器

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摘要

Highly porous carbon sheets were prepared from fresh clover stems under air atmosphere via a facile potassium chloride salt-sealing technique, which not only avoids using the high cost inert gas protection but also spontaneously introduce multi-level porosity into the carbon structure taking advantage of the trace of oxygen in the molten salt system. The as-obtained porous carbon sheets possess high specific surface area of 2244 m(2) g(-1) and interconnected hierarchical pore structures from micro-to macro-scale, which provide abundant storage active sites and fast ion diffusion channels. In addition, the spontaneously formed N (2.55 at%) and 0 (6.94 at%) doping sites not only improve the electron conductivity of the electrode but also enhance the specific capacitance by introducing pseudocapacitance. When employed as supercapacitor electrodes, a high specific capacitance of 436 F g(-1) at I A g(-1) and an excellent rate capacity with capacitance remaining 290 F g(-1) at 50 A g(-1) are demonstrated. Furthermore, the assembled symmetric supercapacitor delivers a high specific capacitance of 420 F g(-1) at 0.5 A g(-1), excellent energy density of 58.4 Wh kg(-1) and good cycling stability which retains 99.4% of the initial capacitance at 5 A g(-1) after 30,000 cycles. (C) 2017 Elsevier B.V. All rights reserved.
机译：在空气气氛下，通过简便的氯化钾盐封技术，从新鲜的三叶草茎中制备高度多孔的碳板，该技术不仅避免使用成本高的惰性气体保护剂，而且利用碳的优势自发地将多级孔隙率引入碳结构。熔融盐系统中的微量氧气。所获得的多孔碳片材具有2244 m（2）g（-1）的高比表面积和从微观到宏观的相互连接的分层孔结构，可提供丰富的存储活性位点和快速的离子扩散通道。另外，自发形成的N（2.55at％）和0（6.94at％）掺杂位点不仅提高了电极的电子电导率，而且通过引入伪电容而提高了比电容。当用作超级电容器电极时，在IA g（-1）时具有436 F g（-1）的高比电容，并且在50 A g（-1）时仍具有290 F g（-1）的容量时显示出极好的倍率容量。此外，组装好的对称超级电容器在0.5 A g（-1）时可提供420 F g（-1）的高比电容，58.4 Wh kg（-1）的出色能量密度和良好的循环稳定性，可保留初始值的99.4％ 30,000次循环后在5 A g（-1）时的电容量。 （C）2017 Elsevier B.V.保留所有权利。

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  • 来源
    《Journal of power sources》 |2017年第30期|375-383|共9页
  • 作者

    Wang Cunjing; Wu Dapeng; Wang Hongju; Gao Zhiyong; Xu Fang; Jiang Kai;

  • 作者单位

    Henan Normal Univ, Collaborat Innovat Ctr Henan Prov Green Mfg Fine, Key Lab Green Chem Media & React, Minist Educ,Sch Chem & Chem Engn, Xinxiang 453007, Henan, Peoples R China|Xinxiang Univ, Sch Chem & Chem Engn, Xinxiang 453003, Henan, Peoples R China;

    Henan Normal Univ, Collaborat Innovat Ctr Henan Prov Green Mfg Fine, Key Lab Green Chem Media & React, Minist Educ,Sch Chem & Chem Engn, Xinxiang 453007, Henan, Peoples R China|Henan Normal Univ, Henan Key Lab Boron Chem & Adv Energy Mat, Xinxiang 453007, Henan, Peoples R China;

    Henan Normal Univ, Collaborat Innovat Ctr Henan Prov Green Mfg Fine, Key Lab Green Chem Media & React, Minist Educ,Sch Chem & Chem Engn, Xinxiang 453007, Henan, Peoples R China|Henan Normal Univ, Sch Environm, Xinxiang 453007, Henan, Peoples R China;

    Henan Normal Univ, Collaborat Innovat Ctr Henan Prov Green Mfg Fine, Key Lab Green Chem Media & React, Minist Educ,Sch Chem & Chem Engn, Xinxiang 453007, Henan, Peoples R China|Henan Normal Univ, Henan Key Lab Boron Chem & Adv Energy Mat, Xinxiang 453007, Henan, Peoples R China;

    Henan Normal Univ, Collaborat Innovat Ctr Henan Prov Green Mfg Fine, Key Lab Green Chem Media & React, Minist Educ,Sch Chem & Chem Engn, Xinxiang 453007, Henan, Peoples R China|Henan Normal Univ, Sch Environm, Xinxiang 453007, Henan, Peoples R China;

    Henan Normal Univ, Collaborat Innovat Ctr Henan Prov Green Mfg Fine, Key Lab Green Chem Media & React, Minist Educ,Sch Chem & Chem Engn, Xinxiang 453007, Henan, Peoples R China|Henan Normal Univ, Sch Environm, Xinxiang 453007, Henan, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Porous carbon; Biomass; Nitrogen doping; Molten salt; Supercapacitor;

    机译：多孔碳;生物质;氮掺杂;熔盐;超级电容器;

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