Construction of simple three-dimensional graphene and metal organic framework for a flexible composites, and derivatives thereof all solid state supercapacitors
In this paper, a simple mixing process to prepare a variety of large-scale three-dimensional (3D) graphene oxide / metal-organic framework (GO / MOF) composites. This method of preparation can be quickly controllable component obtained within a few minutes GO / MOF composite hydrogel, it is also applicable to a range of different MOFs. GO / MOF composite material as a precursor obtained by freeze-drying and calcination to prepare a composite airgel MOF derivatized, e.g. rGO / Fe2O3 and rGO / NiO / Ni composite airgel. When used as a super-capacitor electrode, rGO / Fe2O3 as a super-capacitor electrode, having excellent rate performance, a current density of 1 20 A g 1-time and that the specific capacitance of 869.2 and 289.6 F g-1, and after the 5000 cycle circle, the capacitance without significant attenuation. Further, based on the obtained rGO / Fe2O3 composite airgel, we constructed a flexible solid-state supercapacitor device, at the current 6.4 mA cm-3, the volume capacitance 250 mF cm-3, at a constant current of 50.4 mA cm ( -3) after 5000 cycles under conditions coil electrically capacity even 96.3%, the device also has excellent mechanical flexibility. Principle (c) Construction of an all-solid super capacitor means; Figure 6. (a) specific capacitance at different current densities; (b) Ragone curve a schematic view of a tandem cell and lit red LED; (d) CV curves at different scan rates; (e) cycling performance test; (f) CV curves tested at different curvature conditions.