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Dimensional tailoring of nitrogen-doped graphene for high performance supercapacitors

机译：高性能超级电容器的氮掺杂石墨烯的尺寸纵向

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摘要

Due to its unique properties, graphene has been regarded as a promising electrodematerial in various fields of energy conversion and storage devices. In supercapacitors, however, the graphene electrodes show unexpectedly poor energy densities due to low transferability of charge carriers in the randomly overlaid graphene electrodes. For efficient charge transfers, construction of three-dimensional graphene structures has been generally considered. In this study, contrary to previous strategies, the graphene structures are sequentially tailored from two-dimensional sheets to one-dimensional ribbons and zero-dimensional dots, and then their capacitive behaviors are investigated in a symmetric unit cell. Dimensionality of the graphene determines the local pore structure and morphology of the fabricated graphene electrodes. Hence, it strongly affects the transfer rate of charge carriers and capacitive performance. One-dimensional ribbons, which have a high length-to-width ratio and a consequent net-like porous structure in the fabricated electrode, demonstrate an efficient charge transferability with 378 F g(-1) specific capacitance at 1 A g(-1) current density in 6 M KOH electrolyte. Additionally, a durability study coupled with X-ray photoelectron spectroscopy (XPS) reveals that performance degradation of the graphene-based electrodes mainly results from surface oxidation which inhibits facile electron transfers.
机译：由于其独特的特性，石墨烯被认为是在能量转换和存储装置的各种领域中的有前途的电渗透材料。然而，在超级电容器中，由于随机覆盖的石墨烯电极中的电荷载体的低可转换性，石墨烯电极显示出意外差的能量密度。为了有效电荷转移，通常考虑了三维石墨烯结构的构造。在本研究中，与先前的策略相反，将石墨烯结构从二维纸张依次定制到一维色带和零维度点，然后在对称单元电池中研究其电容性行为。石墨烯的维度决定了所制造的石墨烯电极的局部孔结构和形态。因此，它强烈影响电荷载体的传递速率和电容性能。在制造电极中具有高长度与宽度比和随后的网状多孔结构的一维色带证明了在1A（-1）的378V（-1）特定电容中的有效电荷可转移性（-1 ）6M KOH电解质中的电流密度。另外，与X射线光电子能谱（XPS）耦合的耐久性研究表明，石墨烯基电极的性能劣化主要由抑制容易电子转移的表面氧化产生。

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  • 来源
    《RSC Advances》 |2016年第60期|共7页
  • 作者

    Lee Seung Yong; Choi Chang Hyuck; Chung Min Wook; Chung Jae Hoon; Woo Seong Ihl;

  • 作者单位

    Korea Adv Inst Sci &

    Technol Grad Sch EEWS Daejeon 305701 South Korea;

    Korea Adv Inst Sci &

    Technol Dept Chem &

    Biomol Engn Daejeon 305701 South Korea;

    Korea Adv Inst Sci &

    Technol Grad Sch EEWS Daejeon 305701 South Korea;

    Korea Adv Inst Sci &

    Technol Dept Chem &

    Biomol Engn Daejeon 305701 South Korea;

    Korea Adv Inst Sci &

    Technol Grad Sch EEWS Daejeon 305701 South Korea;

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  • 正文语种 eng
  • 中图分类 化学;
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