CoO nanoparticles deposited on 3D macroporous ozonized RGO networks for high rate capability and ultralong cyclability of pseudocapacitors
| Autor: | Ho Seok Park, Manikantan Kota, Taigyu Joo, Pallab Bhattacharya |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Supercapacitor
Materials science Nanocomposite Graphene Process Chemistry and Technology Oxide Nanoparticle Nanotechnology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Pseudocapacitance 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention chemistry.chemical_compound chemistry law Pseudocapacitor Materials Chemistry Ceramics and Composites 0210 nano-technology Cobalt oxide |
| Zdroj: | Ceramics International. 44:980-987 |
| ISSN: | 0272-8842 |
| Popis: | The integration of pseudocapacitive metal oxides with reduced graphene oxide (RGO) is considered an innovative chemical strategy to resolve both bottlenecks of pseudocapacitor and electrical double-layer capacitor for high performance supercapacitors. Herein, we report a facile synthesis method of highly porous three-dimensional (3D) CoO/RGO nanocomposite via ozone treatment, ice templating, and thermal annealing. The ozonized RGO surface provides a favorable interaction with cobalt precursor for a stable and uniform deposition of well-defined CoO nanoparticles. The morphology, structure, and chemistry of the resulting CoO/RGO nanocomposites are comprehensively characterized by spectroscopic methods. The CoO/RGO nanocomposites show fast and reversible pseudocapacitance due to a large accessible area, rapid ion transport, and low charge transfer resistance arising from 3D internetworked macroporosity. Thus, the nanocomposites achieve high specific capacitance up to 239.4 F g -1 (volumetric capacitance = 12.04 F cm -3 ), excellent rate capability of 79.1%, and ultralong cyclic stabilities (of 93.2% at 10 A g -1 even up to 10,000 cycles) in 6 M KOH electrolyte. This simple synthesis method offers a promising solution for the design of high performance hybrid energy storage materials consisting of high capacity metal oxides and conductive graphene networks. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect