Superior performance of ZnCo2O4/ZnO@multiwall carbon nanotubes with laminated shape assembled as highly practical all-solid-state asymmetric supercapacitors
| Autor: | Ping Zan, Jinkun Sun, Lin Ye, Lijun Zhao, Xijia Yang |
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| Rok vydání: | 2017 |
| Předmět: |
Supercapacitor
Materials science Renewable Energy Sustainability and the Environment Nanotechnology 02 engineering and technology General Chemistry Carbon nanotube 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Capacitance Energy storage 0104 chemical sciences law.invention LED lamp Chemical engineering law Electrode General Materials Science 0210 nano-technology Diode |
| Zdroj: | Journal of Materials Chemistry A. 5:9815-9823 |
| ISSN: | 2050-7496 2050-7488 |
| DOI: | 10.1039/c7ta01618b |
| Popis: | Herein, a ZnCo2O4/ZnO@multiwall carbon nanotube (Zn1Co2@MWCNT) hybrid in situ grown on Ni foam was designed via a two-step method, involving a hydrothermal reaction to synthesize ZnCo2O4/ZnO (Zn1Co2) on Ni foam and then a dipping-drying process to cover MWCNTs on Zn1Co2 at room temperature. The sandwich structure of Zn1Co2@MWCNTs with jungle flake inside was directly used as an electrode material displaying a high specific capacitance of 2069 F g−1 at 1 A g−1, which is higher than those of ZnCo2O4-based electrode materials in most previous reports, and a great cycling stability of 80.2% retention after 3000 cycles. Meanwhile, an all-solid-state asymmetric supercapacitor (ASC) was assembled, utilizing Zn1Co2@MWCNTs as positive electrode and activated carbon (AC) as negative electrode. The ASC device had a high specific capacitance of 111.8 F g−1 (at 1 A g−1), a high energy density of 48.1 W h kg−1 (at 900 W kg−1) and excellent stability with capacitance retention of 92.9% after 3000 cycles. Two serial connected Zn1Co2@MWCNTs//AC ASCs are utilized to light four parallel connected light-emitting diode (LED) bulbs (5 mm, red color), which keep bright for 23 minutes. If three serial connected Zn1Co2@MWCNTs//AC ASCs are utilized to light one LED bulb (5 mm, yellow color), the LED bulb can keep bright for 55 minutes. The excellent electrochemical performances mean the all-solid-state Zn1Co2@MWCNTs//AC ASCs are highly practical for application in the energy storage field. |
| Databáze: | OpenAIRE |
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