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K19.02 - Freestanding 3D Expressway-Like Graphene/Nickel Hydroxide Hybrid Films for High Performance Flexible Supercapacitors 
December 4, 2014   3:45pm - 4:00pm

An facile approach to densely packed freestanding hybrid films for supercapacitor electrodes is developed by self-assembling graphene oxide nanosheets with Ni(OH)2 nanoplates intercalated. In the obtained graphene@Ni(OH)2 hybrid films, Ni(OH)2 nanoplates act as not only effective space inhibitors to prevent graphene restacking but also pseudocapacitors to improve the overall capacitance, while the highly conductive graphene nanosheets serve as expressways for efficient electronic transportation. The 3D expressway-like film electrodes exhibit superior supercapacitor performance including high gravimetric capacitance (~ 605 F/g), high volumetric capacitance (~ 677 F/cm3), excellent rate capability (only 27.7% capacitance loss of its initial value with a current density increased from 0.2 to 50 A/g) and superior cycling stability (167% capacitance increase of its initial capacitance after 5000 cycles). Moreover, such densely packed freestanding film electrodes are highly bendable, which have promising applications in flexible energy storage devices. An asymmetric supercapacitor based on such hybrid film electrodes was demonstrated, which exhibited competitive energy density (26.1 Wh/kg) even under high power density (40744 W/kg). The fabrication process of the graphene@Ni(OH)2 films developed in this work is universe, which is applicable to many other composites with the combinations among 0-D, 1-D and 2-D materials.

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