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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >In situ synthesis of Co_3O_4/graphene nanocomposite material for lithium-ion batteries and supercapacitors with high capacity and supercapacitance
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In situ synthesis of Co_3O_4/graphene nanocomposite material for lithium-ion batteries and supercapacitors with high capacity and supercapacitance

机译：原位合成Co_3O_4 /石墨烯纳米复合材料用于锂离子电池和超级电容器的高容量和超电容

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摘要

C03 04/graphene nanocomposite material was prepared by an in situ solution-based method under reflux conditions. In this reaction progress, Co~(2+) salts were converted to Co_3O_4 nanoparticles which were simultaneously inserted into the graphene layers, upon the reduction of graphite oxide to graphene. The prepared material consists of uniform Co_3O_4 nanoparticles (15-25 nm), which are well dispersed on the surfaces of graphene nanosheets. This has been confirmed through observations by field emission scanning electron microscopy, transmission electron microscopy and atomic force microscopy. The prepared composite material exhibits an initial reversible lithium storage capacity of 722mAh g~(-1) in lithium-ion cells and a specific supercapacitance of 478 F g~(-1) in 2 M KOH electrolyte for supercapacitors, which were higher than that of the previously reported pure graphene nanosheets and Co_3O_4 nanoparticles. Co_3O_4/graphene nanocomposite material demonstrated an excellent electrochemical performance as an anode material for reversible lithium storage in lithium ion cells and as an electrode material in supercapacitors.
机译：通过基于原位溶液的方法在回流条件下制备CO 3 04 /石墨烯纳米复合材料。在该反应过程中，将Co〜（2+）盐转化为Co_3O_4纳米粒子，然后将氧化石墨还原为石墨烯，将其同时插入到石墨烯层中。制备的材料由均匀的Co_3O_4纳米粒子（15-25 nm）组成，它们均匀分散在石墨烯纳米片的表面上。通过场发射扫描电子显微镜，透射电子显微镜和原子力显微镜的观察已经证实了这一点。制备的复合材料在锂离子电池中的初始可逆锂存储容量为722mAh g〜（-1），在超级电容器的2 M KOH电解液中的比超电容为478 F g〜（-1），高于该值。先前报道的纯石墨烯纳米片和Co_3O_4纳米颗粒的一部分。 Co_3O_4 /石墨烯纳米复合材料具有优异的电化学性能，作为锂离子电池中可逆锂存储的阳极材料和超级电容器中的电极材料。

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