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A 2D metal–organic framework/reduced graphene oxide heterostructure for supercapacitor application

机译：用于超级电容器的二维金属-有机骨架/氧化石墨烯异质结构

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Metal organic frameworks (MOFs) with two dimensional (2D) nanosheets have attracted special attention for supercapacitor application due to their exceptional large surface area and high surface-to-volume atom ratios. However, their electrochemical performance is greatly hindered by their poor electrical conductivity. Herein, we report a 2D nanosheet nickel cobalt based MOF (NiCo-MOF)/reduced graphene oxide heterostructure as an electrode material for supercapacitors. The NiCo-MOF 2D nanosheets are in situ grown on rGO surfaces by simple room temperature precipitation. In such hybrid structure the MOF ultrathin nanosheets provide large surface area with abundant channels for fast mass transport of ions while the rGO conductive and physical support provides rapid electron transport. Thus, using the synergistic advantage of rGO and NiCo-MOF nanosheets an excellent specific capacitance of 1553 F g ~(?1) at a current density of 1 A g ~(?1) is obtained. Additionally, the as synthesized hybrid material showed excellent cycling capacity of 83.6% after 5000 cycles of charge–discharge. Interestingly, the assembled asymmetric device showed an excellent energy density of 44 W h kg ~(?1) at a power density of 3168 W kg ~(?1) . The electrochemical performance obtained in this report illustrates hybridization of MOF nanosheets with carbon materials is promising for next generation supercapacitors.
机译：具有二维（2D）纳米片的金属有机骨架（MOF）由于其非凡的大表面积和高原子比体积比而引起了超级电容器应用的特别关注。但是，它们的电化学性能由于其差的电导率而大大受到阻碍。在本文中，我们报道了一种基于2D纳米片镍钴的MOF（NiCo-MOF）/还原石墨烯氧化物异质结构，作为超级电容器的电极材料。 NiCo-MOF 2D纳米片通过简单的室温沉淀在rGO表面上原位生长。在这种混合结构中，MOF超薄纳米片可提供较大的表面积和丰富的通道，可快速转移离子，而rGO导电和物理支持物则可提供快速的电子转移。因此，利用rGO和NiCo-MOF纳米片的协同优势，在电流密度为1A g〜（Δ1）的情况下获得了1553F g〜（Δ1）的优异的比电容。此外，这种合成的杂化材料在经过5000次充放电后显示出出色的循环容量，为83.6％。有趣的是，组装的非对称器件在功率密度为3168 W kg〜（？1）时显示出44 W h kg〜（？1）的出色能量密度。该报告中获得的电化学性能表明，MOF纳米片与碳材料的杂交有望用于下一代超级电容器。

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