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Necklace-like Nitrogen-Doped Tubular Carbon 3D Frameworks for Electrochemical Energy Storage

机译：项链状氮掺杂管状碳3D框架，用于电化学储能

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摘要

The design and synthesis of a necklace-like nitrogen-doped tubular carbon (NTC) are presented by growing microporous polyhedral ZIF-8 particles and a uniform layer of ZIF-8 on sacrificial ZnO tetrapods (ZTPs). Oxygen vacancies together with defect regions on the surface of the ZTPs result in the formation of ZIF-8 polyhedra in conjunction with a very thin shell. This necklace-like NTC structure has a high N content, very large surface area, ultrahigh microporosity, and quite high electrical conductivity. NTC-based symmetrical supercapacitor and zinc-ion capacitor (ZIC) devices are fabricated and their electrochemical performance is measured. The NTC supercapacitor shows an ultrahigh rate capability (up to 2000 mV s(-1)) and promising cycle life, retaining 91.5% of its initial performance after 50 000 galvanostatic charge-discharge cycles. An aqueous ZIC, constructed using the NTC, has a specific capacitance of 341.2 F g(-1) at a current density of 0.1 A g(-1) and an energy density of 189.6 Wh kg(-1) with a 2.0-V voltage window, respectively. The outstanding performance is attributed to the NTC high N-doping content, a continuous "polyhedral 3D hollow" architecture and the highly porous microtubular arms exhibiting very high surface area.
机译：通过在牺牲ZnO四脚架（ZTP）上生长微孔多面体ZIF-8颗粒和ZIF-8均匀层，提出了项链状氮掺杂管状碳（NTC）的设计和合成。 ZTP表面上的氧空位以及缺陷区域会导致ZIF-8多面体与非常薄的外壳结合在一起形成。这种项链状的NTC结构具有很高的N含量，非常大的表面积，超高的微孔率和相当高的电导率。制作了基于NTC的对称超级电容器和锌离子电容器（ZIC）器件，并测量了它们的电化学性能。 NTC超级电容器具有超高倍率能力（高达2000 mV s（-1）），并具有良好的循环寿命，在经过50000次恒电流充放电循环后，仍保持其初始性能的91.5％。使用NTC构造的水性ZIC在电流密度为0.1 A g（-1）时的比电容为341.2 F g（-1），在2.0-V电压下的能量密度为189.6 Wh kg（-1）电压窗口。出色的性能归因于NTC的高N掺杂含量，连续的“多面3D中空”结构以及具有很高表面积的高孔隙度微管臂。

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  • 来源
    《Advanced Functional Materials》 |2020年第10期|1909725.1-1909725.9|共9页
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  • 作者单位

    Inst Basic Sci Ctr Multidimens Carbon Mat Ulsan 44919 South Korea;

    Uppsala Univ Dept Phys & Astron Box 516 SE-75120 Uppsala Sweden;

    Univ Kiel Inst Mat Sci Funct Nanomat Kaiserstr 2 D-24143 Kiel Germany;

    Univ Kiel Inst Mat Sci Funct Nanomat Kaiserstr 2 D-24143 Kiel Germany|Univ Southern Denmark Mads Clausen Inst NanoSYD Alsion 2 DK-6400 Sonderborg Denmark;

    Uppsala Univ Dept Phys & Astron Box 516 SE-75120 Uppsala Sweden|Royal Inst Technol KTH Dept Mat & Engn SE-10044 Stockholm Sweden;

    Inst Basic Sci Ctr Multidimens Carbon Mat Ulsan 44919 South Korea|Ulsan Natl Inst Sci & Technol Sch Energy & Chem Engn Sch Mat Sci & Engn Dept Chem Ulsan 44919 South Korea;

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  • 正文语种 eng
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  • 关键词

    energy storage; metal-organic frameworks; supercapacitors; tetrapods; zinc-ion capacitors;

    机译：储能;金属有机框架;超级电容器四足动物锌离子电容器;

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