Scalable preparation of hierarchical porous activated carbon/graphene composites for high-performance supercapacitors
| Autor: | Hongwei Zhu, Yunkai Shi, Jianning Gan, Qianming Gong, Yang Shao, Mouyi Weng, Ming Zhao, Daming Zhuang, Feng Pan, Ce-Wen Nan, Dazhi Wang, Ji Liang, Yilun Huang, Yuyao Li |
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| Rok vydání: | 2019 |
| Předmět: |
Supercapacitor
Materials science Renewable Energy Sustainability and the Environment Graphene Carbonization 02 engineering and technology General Chemistry Electrolyte 021001 nanoscience & nanotechnology law.invention Adsorption X-ray photoelectron spectroscopy law Specific surface area medicine General Materials Science Composite material 0210 nano-technology Activated carbon medicine.drug |
| Zdroj: | Journal of Materials Chemistry A. 7:10058-10066 |
| ISSN: | 2050-7496 2050-7488 |
| DOI: | 10.1039/c9ta00353c |
| Popis: | Hierarchical porous activated carbon particles covered with graphene were prepared by spray-drying a GO/maltodextrin aqueous suspension followed by carbonization and activation. The as-prepared core–shell particles had a high specific surface area (up to 2457 m2 g−1) and exhibited an outstanding specific capacitance (up to 405 F g−1 at 0.2 A g−1, 299 F g−1 at 1 A g−1 and 199 F g−1 at 50 A g−1) along with excellent cycling stability, high energy density and power density in a KOH electrolyte. Moreover, the spontaneous formation of the core–shell structure during the spray-drying process was verified by DFT calculations with the support of XPS chemical analysis and TEM characterization. This designable and controllable strategy of spray-drying could be introduced to design and develop new composite materials with a core–shell structure for potential applications in energy storage, catalysis and adsorption. |
| Databáze: | OpenAIRE |
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