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High-performance supercapacitors based on conductive graphene combined with Ni(OH)2 nanoflakes

机译：基于导电石墨烯和Ni（OH） 2 纳米薄片的高性能超级电容器

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摘要

A green and facile strategy is reported for the synthesis of a three-dimensional (3D) graphene nanosheets (GNS)/Ni(OH)2 composite for use as a supercapacitor material. During this process, graphene oxide was reduced to graphene and Ni(OH)2 was attached in it to form the GNS/Ni(OH)2 composite via a chemical precipitation route without any complicated procedures. The product was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The analyses indicated that the Ni(OH)2 sheets were well interwoven on the surfaces of the graphene nanosheets. Furthermore, the composite was electrochemically tested by cyclic voltammetry, galvanostatic charge/discharge, specific capacitance, and by assessing its cycle life. The GNS/Ni(OH)2 composite exhibited a high specific supercapacitance of 2053 F g?1 at a current density of 0.3 A g?1 in 6 M KOH electrolyte and a long cycle life, along with 97% specific capacitance remaining after 1000 cycles. The GNS/Ni(OH)2 composite had superb electrochemical performance compared to bare Ni(OH)2, which could be attributed to its architecture. These results suggest that the GNS/Ni(OH)2 composite could have potential application as a supercapacitor material.
机译：报道了一种绿色且简便的策略，用于合成用作超级电容器材料的三维（3D）石墨烯纳米片（GNS）/ Ni（OH） 2 复合材料。在此过程中，将氧化石墨烯还原为石墨烯，并在其中附着Ni（OH） 2 以形成GNS / Ni（OH） 2 复合物通过的化学沉淀路线，无需任何复杂的程序。通过X射线衍射（XRD）和扫描电子显微镜（SEM）对产物进行表征。分析表明，Ni（OH） 2 薄片在石墨烯纳米薄片的表面上很好地交织。此外，通过循环伏安法，恒电流充电/放电，比电容并评估其循环寿命对复合材料进行了电化学测试。 GNS / Ni（OH） 2 复合材料在室温下显示2053 F g ？1 的高比超电容。在6 M KOH电解液中的电流密度为0.3 A g ？1 ，循环寿命长，在1000次循环后仍具有97％的比电容。与裸露的Ni（OH） 2 相比，GNS / Ni（OH） 2 复合材料具有优异的电化学性能，这可以归因于其架构。这些结果表明，GNS / Ni（OH） 2 复合材料可能具有作为超级电容器材料的潜在应用。

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