Rapid synthesis of Ni(OH)2/graphene nanosheets and NiO@Ni(OH)2/graphene nanosheets for supercapacitor applications
| Autor: | Yunhui Qi, Yinong Lyu, Yunfei Liu, Yali Luo, Rui Zhu, Qiuliang Wang, Chengfei Zhu |
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| Rok vydání: | 2019 |
| Předmět: |
Supercapacitor
Horizontal scan rate Chemistry Graphene Composite number Non-blocking I/O 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Capacitance Catalysis 0104 chemical sciences Anode law.invention Chemical engineering law Materials Chemistry 0210 nano-technology |
| Zdroj: | New Journal of Chemistry. 43:3091-3098 |
| ISSN: | 1369-9261 1144-0546 |
| DOI: | 10.1039/c8nj04959a |
| Popis: | Hexagonal β-Ni(OH)2 nanoplates grown on commercial graphene nanosheets (GNSs) were successfully prepared through a fast and facile microwave hydrothermal method. The GNSs/NiO@Ni(OH)2 composite was obtained via an additional treatment, due to which NiO separated out from the hexagonal nanoplates. A possible formation mechanism of these composites was put forward based on their morphology and microstructure. The GNSs/Ni(OH)2 composite exhibited high specific capacitance of 1172 F g−1 at a scan rate of 5 mV s−1 and showed specific capacitance of 1042 F g−1 at a discharge current density of 3 A g−1, whereas the GNSs/NiO@Ni(OH)2 composite showed higher rate capability (684 F g−1 at a discharge current density of 24 A g−1, ∼92% capacitance retention at 3 A g−1). GNSs/Ni(OH)2 anodes after the first charge–discharge cycle were characterized by TEM. Besides, both the composites delivered high energy density and high power density, due to which they are promising materials for high-performance supercapacitors. |
| Databáze: | OpenAIRE |
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