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A reduced graphene oxide modified metallic cobalt composite with superior electrochemical performance for supercapacitors

机译：一种石墨烯氧化物改性金属钴复合材料，具有优异的超级电容器电化学性能

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摘要

In this work, a unique reduced graphene oxide modified metallic cobalt (rGO/Co) composite, in which Co nanoparticles are in situ anchored on rGO sheets, has been synthesized via a facile one pot co-precipitation approach. Such a composite exhibited an impressive performance when used in (asymmetric) supercapacitors. For comparison purposes, pure rGO and Co were also prepared and investigated. Microscopic observation techniques, nitrogen sorption analysis and electrochemical methods etc. were used to characterize the materials' properties. The physical characterizations revealed rGO/Co possessed a "particle on sheet" structure with a "point to face" electronic contact between these two components, and the size of Co was much smaller than pure Co due to the geometric confinement of rGO, as well as a larger Brunauer-Emmett-Teller (BET) surface area resulting from the structural synergistic effect for alleviating the agglomeration of each component. Remarkably, the rGO/Co composite displayed the best electrochemical performance among the three synthesized samples with a capacity as high as 882.7 F g(-1) at a current density of 2 A g(-1) and presented a high rate capability as well. Moreover, an asymmetric supercapacitor using rGO/Co as positive active material and activated carbon (AC) as negative active material has also been fabricated and tested in the potential window ranging between 0 and 1.6 V, which was demonstrated to be able to achieve a maximum energy density of 40.7 W h kg(-1) at a power density of 1585.0 W kg(-1) as well as excellent rate capability and outstanding cycling durability.
机译：在这项工作中，一种独特的氧化石墨烯改性金属钴（Rgo / Co）复合材料，其中Co纳米颗粒在RGO板上锚定，通过容易的一个罐共沉淀方法合成。当使用（非对称）超级电容器时，这种复合材料表现出令人印象深刻的性能。为了比较目的，还制备和研究了纯RGO和CO。微观观察技术，氮吸附分析和电化学方法等用于表征材料的性质。物理特征揭示了rgo / co在这两个部件之间具有“点面对面”的“粒子”结构，并且由于RGO的几何限制，CO的尺寸远小于纯CO。作为一个较大的Brunauer-Emmett-keter（bet）表面积，由结构协同效应来减轻每种组分的聚集来产生。值得注意的是，RGO / CO复合材料在三个合成样品中以高达882.7fg（-1）的3个合成样品在电流密度为2Ag（-1）中的最佳电化学性能，并呈现出高速率能力。此外，使用RGO / CO作为阳性活性材料和活性炭（AC）的非对称超电容器也被制造并在0到1.6V之间的潜在窗口中制造并测试，这被证明能够实现最大值能量密度为40.7WH kg（-1）的功率密度为1585.0W kg（-1），以及优异的速率能力和出色的循环耐久性。

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  • 来源
    《RSC Advances》 |2015年第78期|共8页
  • 作者

    Liu Guijing; Wang Lei; Wang Bo; Gao Tiantian; Wang Dianlong;

  • 作者单位

    Harbin Inst Technol Sch Chem Engn &

    Technol Harbin 150001 Peoples R China;

    Harbin Inst Technol Sch Chem Engn &

    Technol Harbin 150001 Peoples R China;

    Harbin Inst Technol Sch Chem Engn &

    Technol Harbin 150001 Peoples R China;

    Harbin Inst Technol Sch Chem Engn &

    Technol Harbin 150001 Peoples R China;

    Harbin Inst Technol Sch Chem Engn &

    Technol Harbin 150001 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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