Growth of ultrathin Ni Co Al layered double hydroxide on reduced graphene oxide and superb supercapacitive performance of the resulting composite
| Autor: | Hai-An Wang, Peng-Fei Huang, Yong Yan, Cui-Hong Zheng, Ting Yao, Dao-Lai Fang, Tian-Ran Xu |
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| Rok vydání: | 2016 |
| Předmět: |
Supercapacitor
Materials science Graphene Mechanical Engineering Composite number Metals and Alloys Oxide Nanotechnology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Capacitance 0104 chemical sciences law.invention chemistry.chemical_compound chemistry Chemical engineering Mechanics of Materials law Materials Chemistry Hydroxide 0210 nano-technology Ethylene glycol |
| Zdroj: | Journal of Alloys and Compounds. 678:93-101 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2016.03.293 |
| Popis: | Ultrathin Ni Co Al layered double hydroxide (LDH) sheets directly grew on reduced graphene oxide (RGO) nanosheets by a facile hydrothermal route in a mixed solvent of water and ethylene glycol, yielding the RGO/Ni 0.75−x Co x Al 0.25 -LDH (x = 0, 0.05, 0.15) composites. Structural analyses revealed that the resulting composites presented a unique morphology of crumpled silk veil waves, in which the ultrathin Ni 0.75−x Co x Al 0.25 -LDH sheets, composed of 2–3 host layers, were entangled with the rippled RGO nanosheets. Electrochemical analyses demonstrated that the RGO/Ni 0.70 Co 0.05 Al 0.25 -LDH composite showed superior supercapacitive performance, as compared with the pure Ni 0.70 Co 0.05 Al 0.25 -LDH and the RGO/Ni 0.75−x Co x Al 0.25 -LDH (x = 0, 0.15) composites. It exhibited not only ultrahigh cycling stability and good rate capability, but also considerably high specific capacitance. It possessed a high specific capacitance of 1544 F g −1 at current densities of 1 A g −1 , still delivering a high capacitance of 1081 F g −1 at an increased current density of 40 A g −1 . After cycled at 10 A g −1 for 2000 cycles, it retained a capacitance of 1343 F g −1 without capacitance decay observed. The superb supercapacitive performance along with the facile synthesis method adopted suggested that the RGO/Ni 0.70 Co 0.05 Al 0.25 -LDH composite was promising for supercapacitor applications. |
| Databáze: | OpenAIRE |
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