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Lignin-derived carbon nanosheets for high-capacitance supercapacitors

机译：木质素衍生的碳纳米片，用于高电容超级电容器

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摘要

Lignin, a type of abundant and low-cost biomass, is successfully utilized as a carbon precursor to prepare carbon nanosheets (CNSs) by freeze-casting of a lignin aqueous dispersion followed by direct carbonization without any activating treatment. The size and specific area of the obtained lignin-derived CNSs can be manipulated by controlling the concentrations of lignin aqueous dispersions, which in turn influences the graphitization degree of the CNSs as confirmed by wide angle X-ray scattering analysis and Raman spectroscopy. X-ray photoelectron spectroscopy study indicates that the CNSs contain similar to 11-16 at% oxygen heteroatoms, which contribute to additional pseudocapacitance. The three-electrode supercapacitors based on optimized CNSs show a high capacitance of 281 F g(-1) at 0.5 A g(-1) current density and good cycling stability in H2SO4 aqueous electrolyte. The study provides a simple, inexpensive, and environmentally friendly method for preparation of CNSs from various water-soluble biomass carbon precursors.
机译：木质素，一种丰富和低成本的生物质，成功用作通过冷冻浇注木质素水性分散体的碳纳米片（CNS），然后直接碳化而没有任何活化处理。通过控制木质素含水分散体的浓度，可以操纵所获得的木质素衍生的CNS的尺寸和特异性区域，这反过来影响通过广角X射线散射分析和拉曼光谱证实的CNSS的石墨化程度。 X射线光电子能谱研究表明，CNSS在％氧杂原子中含有11-16个，这有助于额外的假偶像。基于优化的CNSS的三电极超级电容器在0.5Ag（-1）电流密度和H 2 SO 4水电解质中的循环稳定性良好的高电容为281fg（-1）。该研究提供了一种简单，廉价和环保的方法，用于制备来自各种水溶性生物质碳前体的CNS。

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  • 来源
    《RSC Advances》 |2017年第77期|共7页
  • 作者

    Liu Wanshuang; Yao Yimin; Fu Ouli; Jiang Sihan; Fang Yucheng; Wei Yi; Lu Xuehong;

  • 作者单位

    Donghua Univ Ctr Civil Aviat Composites 2999 North Renmin Rd Shanghai 201620 Peoples R China;

    Donghua Univ Ctr Civil Aviat Composites 2999 North Renmin Rd Shanghai 201620 Peoples R China;

    Donghua Univ Ctr Civil Aviat Composites 2999 North Renmin Rd Shanghai 201620 Peoples R China;

    Donghua Univ Ctr Civil Aviat Composites 2999 North Renmin Rd Shanghai 201620 Peoples R China;

    Donghua Univ Ctr Civil Aviat Composites 2999 North Renmin Rd Shanghai 201620 Peoples R China;

    Donghua Univ Ctr Civil Aviat Composites 2999 North Renmin Rd Shanghai 201620 Peoples R China;

    Nanyang Technol Univ Sch Mat Sci &

    Engn 50 Nanyang Ave Singapore 639798 Singapore;

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  • 正文语种 eng
  • 中图分类 化学;
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