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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >2-Amino-3-chloro-1,4-naphthoquinone-covalent modification of graphene nanosheets for efficient electrochemical energy storage
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2-Amino-3-chloro-1,4-naphthoquinone-covalent modification of graphene nanosheets for efficient electrochemical energy storage

机译：2-氨基-3-氯-1,4-萘醌 - 石墨烯纳米内的共价改性为高效电化学储存

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摘要

Green and renewable organic redox molecules are greatly advantageous over conventional inorganic intercalation electrode materials in terms of electrochemical reversibility and cycling stability. However, their electrical insulation prevents them from being used alone as electrode materials for supercapacitors. Herein, 2-amino-3-chloro-1,4-naphthoquinone (ACNQ) molecules were covalently grafted onto graphene nanosheets (GNS) via diazotization. The ACNQ-functionalized GNS (CNQ-GNS) electrode material exhibited a high specific capacitance of 364.2 +/- 10 F g(-1) at a current density of 1 A g(-1), which is much larger than that of bare GNS (190 +/- 6 F g(-1)). Moreover, the electrode exhibited an outstanding rate capability (capacitance retention of 76.8% at 100 A g(-1)). Finally, an asymmetric supercapacitor device was fabricated using graphene nanosheets as the positive electrode and the optimized CNQ-GNS as the negative electrode, which displayed a high energy density of 19.1 W h kg(-1) at a power density of 0.8 kW kg(-1) with a long cycling life span (nearly no loss after 10000 cycles at 5 A g(-1)) in 1 M H2SO4 electrolyte. Briefly, the highly conductive GNS scaffold delivers a high electrical double-layer capacitance, while the organic functional groups covalently bonded on the GNS contribute additional faradaic pseudocapacitance, resulting in outstanding electrochemical energy storage.
机译：绿色和可再生有机氧化还原分子是优于常规无机嵌入电极材料大大有利的电化学可逆性和循环稳定性方面。然而，它们的电绝缘体可防止它们单独使用作为超级电容器的电极材料。在本文中，2-氨基-3-氯-1,4-萘醌（ACNQ）分子共价地接枝到通过重氮化石墨烯纳米片（GNS）。 ACNQ官能化GNS（CNQ-GNS）电极材料在电流密度为1A（-1）的电流密度上表现出364.2 +/- 10 f g（-1）的高比电容远远大于裸露GNS（190 +/- 6 f g（-1））。此外，电极表现出优异的速率能力（100Ag（-1）的电容保持76.8％）。最后，使用石墨烯纳米片作为正极和优化的CNQ-GNS作为负电极制造不对称的超级电容器装置，其在功率密度为0.8kW kg的高能密度为19.1 w h kg（-1）（ -1）具有长循环寿命（在10000次在5Ag（-1）之后几乎没有损失），在1M H 2 SO 4电解质中。简而言之，高导电GNS支架提供高电双层电容，而在GNS上共价键合的有机官能团有助于额外的佛教假偶像码，导致卓越的电化学能量储存。

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    Hou Lijie; Hu Zhongai; Wu Hongying; Wang Xiaotong; Xie Yandong; Li Shanshan; Ma Fuquan; Zhu Cuimei;

  • 作者单位

    Northwest Normal Univ Coll Chem &

    Chem Engn Key Lab Ecoenvironm Related Polymer Mat Minist Educ Key Lab Polymer Mat Gansu Prov Lanzhou 730070 Gansu Peoples R China;

    Northwest Normal Univ Coll Chem &

    Chem Engn Key Lab Ecoenvironm Related Polymer Mat Minist Educ Key Lab Polymer Mat Gansu Prov Lanzhou 730070 Gansu Peoples R China;

    Northwest Normal Univ Coll Chem &

    Chem Engn Key Lab Ecoenvironm Related Polymer Mat Minist Educ Key Lab Polymer Mat Gansu Prov Lanzhou 730070 Gansu Peoples R China;

    Northwest Normal Univ Coll Chem &

    Chem Engn Key Lab Ecoenvironm Related Polymer Mat Minist Educ Key Lab Polymer Mat Gansu Prov Lanzhou 730070 Gansu Peoples R China;

    Northwest Normal Univ Coll Chem &

    Chem Engn Key Lab Ecoenvironm Related Polymer Mat Minist Educ Key Lab Polymer Mat Gansu Prov Lanzhou 730070 Gansu Peoples R China;

    Northwest Normal Univ Coll Chem &

    Chem Engn Key Lab Ecoenvironm Related Polymer Mat Minist Educ Key Lab Polymer Mat Gansu Prov Lanzhou 730070 Gansu Peoples R China;

    Northwest Normal Univ Coll Chem &

    Chem Engn Key Lab Ecoenvironm Related Polymer Mat Minist Educ Key Lab Polymer Mat Gansu Prov Lanzhou 730070 Gansu Peoples R China;

    Northwest Normal Univ Coll Chem &

    Chem Engn Key Lab Ecoenvironm Related Polymer Mat Minist Educ Key Lab Polymer Mat Gansu Prov Lanzhou 730070 Gansu Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;无机化学;
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