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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Hierarchical self-assembly of microscale leaf-like CuO on graphene sheets for high-performance electrochemical capacitors
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Hierarchical self-assembly of microscale leaf-like CuO on graphene sheets for high-performance electrochemical capacitors

机译：高性能电化学电容器在石墨烯片上的微细叶状CuO的分层自组装

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In this paper, a leaf-like porous CuO-graphene nanostructure is synthesized by a hydrothermal method. The as-prepared composite is characterized using XRD, Raman, SEM, TEM and nitrogen adsorption-desorption. The growth mechanism is discussed by monitoring the early growth stages. It is shown that the CuO nanoleaves are formed through oriented attachment of tiny Cu(OH)2 nanowires. Electrochemical characterization demonstrates that the leaf-like CuO-graphene are capable of delivering specific capacitances of 331.9 and 305 F g~(-1) at current densities of 0.6 and 2 A g~(-1) respectively. A capacity retention of 95.1% can be maintained after 1000 continuous charge-discharge cycles, which may be attributed to the improvement of electrical contact by graphene and mechanical stability by the layer-by-layer structure. The method provides a facile and straightforward approach to synthesize CuO nanosheets on graphene and may be readily extended to the preparation of other classes of hybrids based on graphene sheets for technological applications.
机译：本文采用水热法合成了叶片状的多孔CuO-石墨烯纳米结构。使用XRD，拉曼，SEM，TEM和氮气吸附-解吸对制备的复合材料进行表征。通过监测早期生长阶段来讨论生长机制。结果表明，CuO纳米叶是通过微小的Cu（OH）2纳米线的定向附着而形成的。电化学表征表明，叶状CuO-石墨烯能够分别以0.6和2 A g〜（-1）的电流密度传递331.9和305 F g〜（-1）的比电容。在1000次连续的充放电循环后，可以保持95.1％的容量保持率，这可能归因于石墨烯改善了电接触性以及逐层结构改善了机械稳定性。该方法提供了在石墨烯上合成CuO纳米片的简便直接的方法，并且可以容易地扩展到基于石墨烯片的其他类型杂化物的制备以用于技术应用。

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