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Ni(OH)(2) nanosheets grown on a 3D graphene framework as an excellent cathode for flexible supercapacitors

机译:在3D石墨烯骨架上生长的Ni(OH)(2)纳米片作为柔性超级电容器的出色阴极

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摘要

Ni(OH)(2) nanosheet/3D graphene (3DG) framework hybrid materials have been prepared by combining chemical vapor deposition (CVD) technology and a facile hydrothermal method. The free-standing Ni(OH)(2) nanosheet/3DG composite was investigated as the cathode material for supercapacitors without the need for addition of either binder or metal-based current collector. Consequently, the obtained Ni(OH)(2) nanosheet/3DG composite electrode exhibits superior specific capacitance and rate capability to the Ni(OH)(2) nanosheet/Ni foam and Ni(OH)(2) nanosheet/carbon fiber cloth composite electrodes. This novel structure brings the composite an electrochemical capacitance as high as 2860 F g(-1) at a current density of 2 A g(-1), and maintains 1791 F g(-1) at 30 A g(-1). Moreover, the composite electrode also exhibits a high specific capacitance of 2461 F g(-1) at a scan rate of 5 mV s(-1).
机译:Ni(OH)(2)纳米片/ 3D石墨烯(3DG)框架杂化材料已通过结合化学气相沉积(CVD)技术和简便的水热方法制备。研究了独立式Ni(OH)(2)纳米片/ 3DG复合材料作为超级电容器的阴极材料,而无需添加粘合剂或金属基集电器。因此,所获得的Ni(OH)(2)纳米片/ 3DG复合电极表现出比Ni(OH)(2)纳米片/ Ni泡沫和Ni(OH)(2)纳米片/碳纤维布复合材料优异的比电容和倍率性能电极。这种新颖的结构使复合材料在2 A g(-1)的电流密度下具有高达2860 F g(-1)的电化学电容,并在30 A g(-1)下保持1791 F g(-1)。此外,复合电极在5 mV s(-1)的扫描速率下还具有2461 F g(-1)的高比电容。

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