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Self-assembled Ni/NiO/RGO heterostructures for high-performance supercapacitors

机译:自组装Ni / NiO / RGO异质结构,用于高性能超级电容器

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A nano-sized nickelickel oxide/RGO (Ni/NiO/RGO) nano-hybrid was generated successfully by using a facile and green sol-gel approach, with the reduced graphene oxide as an effective component, for developing a high-efficiency electrode material with super-capacitance. In the novel hierarchical nanocomposite, the combination of metallic nickel interfaced with the nickel oxide was created by the reduction of a nickel nitrate precursor with the carbon of the reduced graphene oxide surface, during the thermal treatment in nitrogen. The electrochemical performances of the Ni/NiO/RGO composite were measured through cyclic voltammetry tests and galvanostatic charge-discharges, as a supercapacitor material. Due to the higher conductivity and synergistic effect, the new hybrid delivered a high specific capacitance of 1027.27 F g(-1) at the charge/discharge current density of 2 A g(-1), and 720 F g(-1) at 20 A g(-1). After 1000 uninterrupted cycles at 5 A g(-1), the high specific capacitance value can be still stabilized, and kept at 92.95% of the initial value of the specific capacitance for Ni/NiO/RGO. This new nano composite with RGO and Ni/NiO exhibits great promise as an electrode material for supercapacitors.
机译:纳米镍/氧化镍/ RGO(Ni / NiO / RGO)纳米杂化物是通过使用简便且绿色的溶胶-凝胶方法成功制备的,其中还原的氧化石墨烯为有效成分,从而开发了高效率超级电容的电极材料。在新颖的分级纳米复合材料中,在氮气中热处理期间,通过将硝酸镍前体与还原的氧化石墨烯表面的碳还原,可以生成与氧化镍相接的金属镍的组合。 Ni / NiO / RGO复合材料的电化学性能通过循环伏安法测试和恒电流充放电作为超级电容器材料进行了测量。由于具有更高的电导率和协同效应,这种新型混合电池在2 A g(-1)的充/放电电流密度和720 F g(-1)的充放电电流密度下可提供1027.27 F g(-1)的高比电容。 20 A g(-1)。经过5 A g(-1)的1000次不间断循环后,高比电容值仍可以稳定,并保持在Ni / NiO / RGO的比电容初始值的92.95%。这种具有RGO和Ni / NiO的新型纳米复合材料作为超级电容器的电极材料具有广阔的前景。

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