Rational design of hybrid Co3O4/graphene films: Free-standing flexible electrodes for high performance supercapacitors
| Autor: | Zhimin Bai, Dejun Li, Dongbin Xiong, Linlin Fan, Xihong Lu, Jianwei Li, Conglai Long, Xifei Li, Hui Shan |
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| Rok vydání: | 2018 |
| Předmět: |
Supercapacitor
Materials science Graphene General Chemical Engineering Nanotechnology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Capacitance Energy storage 0104 chemical sciences law.invention law Electrode 0210 nano-technology Current density Electrical conductor |
| Zdroj: | Electrochimica Acta. 259:338-347 |
| ISSN: | 0013-4686 |
| Popis: | Flexible electrodes with superior mechanical and electrochemical properties are essential for flexible and foldable supercapacitors (SCs) for subminiature and integrated energy storage devices. Herein, we developed a novel and scalable method to fabricate highly flexible free-standing Co 3 O 4 /graphene film (GF) as robust supercapacitor electrode, in which nanostructured Co 3 O 4 arrays directly grow on highly flexible GF substrates. Originating from the high mass loading of the Co 3 O 4 as well as the synergistic effects of electrochemical active Co 3 O 4 and conductive GF, the fabricated Co 3 O 4 /GF electrodes deliver outstanding electrochemical properties without current collectors or binders. The Co 3 O 4 phase in the Co 3 O 4 /GF delivers a high capacitance contribution of 652 F g −1 after 3000 cycles at a current density of 2 A g −1 , four times higher than the pristine Co 3 O 4 . More importantly, a superior rate capability of 665 F g −1 was achieved at a high current density of 20 A g −1 . These results demonstrate that the flexible hybrid film electrodes possess significant potential for the application of wearable energy storage devices. |
| Databáze: | OpenAIRE |
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