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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Organic multi-electron redox couple-induced functionalization for enabling ultrahigh rate and cycling performances of supercapacitors
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Organic multi-electron redox couple-induced functionalization for enabling ultrahigh rate and cycling performances of supercapacitors

机译：有机多电子氧化还原耦合诱导的超高速率和超级电容器循环性能的官能化

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摘要

In the present work, the danthron molecule (1,8-dihydroxyanthraquinone, DT) with multi-electron redox centers as a novel organic electrochemically active material for supercapacitors has been decorated on reduced graphene oxide nanosheets (RGNs) via a facile one-step reflux method. The resultant danthron functionalized RGNs (DT-RGNs) composite electrode material not only provided a fast and reversible 4e(-)/4H(+) redox reaction because of two types of redox-active organic functional groups (carbonyl and hydroxyl) in DT, but also preserved the unique electrode architecture with the required conductivity of the graphene nanosheets. In the three-electrode system, the optimized electrode (DT-RGNs 3 : 5) exhibited an excellent capacitance of 491 F g(-1) at 1 A g(-1) which is three times higher than that of bare RGNs. Most importantly, the DT-RGNs electrode showed an ultrahigh rate capability of 80.8% capacitance retention at 100 A g(-1) and a superior electrochemical stability of 98.8% after 10 000 cycles at 10 A g(-1), outstripping a great amount of reported organic and inorganic electrodes. Meanwhile, the effect of intramolecular and/or intermolecular hydrogen bonds between carbonyl and hydroxyl on the electrochemical properties of the DT-RGNs electrode was investigated. Finally, the novel symmetric supercapacitor (DT-RGNs SSC) was assembled to evaluate the actual energy storage properties of electrode materials.
机译：在本作本作的工作中，用多电子氧化还原中心作为超级电容器的新型有机电化学活性物质的Danthron分子（1,8-二羟基醌，DT）已经通过容易的一步回流在整个石墨烯氧化物纳米片（RGNS）上装饰在氧化物氧化物纳米片（RGNS）上装饰方法。由此产生的Danthron官能化RGNS（DT-RGNS）复合电极材料不仅提供了一种快速和可逆的4E（ - ）/ 4H（+）氧化还原反应，因为DT中的两种氧化还原活性有机官能团（羰基和羟基），而且还保留了独特的电极架构，具有石墨烯纳米片的所需电导率。在三电极系统中，优化电极（DT-RGNS 3：5）在1A的1A（-1）下表现出491f g（-1）的优异电容，其比裸rgns高三倍。最重要的是，DT-RGNS电极在100A G（-1）下的80.8％电容保留的超高速率能力，10 A G（-1）后10 000次循环后的优异电化学稳定性为98.8％，超出伟大报告的有机和无机电极的量。同时，研究了羰基与羟基之间的分子内和/或分子间氢键对DT-RGNS电极的电化学性质之间的影响。最后，组装了新型对称超级电容器（DT-RGNS SSC）以评估电极材料的实际储能性能。

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    An Ning; Hu Zhongai; Wu Hongying; Yang Yuying; Lei Ziqiang; Dong Wenkui;

  • 作者单位

    Lanzhou Jiaotong Univ Sch Chem &

    Biol Engn Lanzhou 730070 Peoples R China;

    Northwest Normal Univ Coll Chem &

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

    Northwest Normal Univ Coll Chem &

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

    Northwest Normal Univ Coll Chem &

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

    Northwest Normal Univ Coll Chem &

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

    Lanzhou Jiaotong Univ Sch Chem &

    Biol Engn Lanzhou 730070 Peoples R China;

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  • 正文语种 eng
  • 中图分类 工程材料学;
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