A three-dimensional Co5-cluster-based MOF as a high-performance electrode material for supercapacitor
Autor: | Lifang Lai, Gexiang Gao, Hongren Rong, Yanwei Ma, Qi Liu, Xianmei Wang |
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Rok vydání: | 2020 |
Předmět: |
Supercapacitor
Thermogravimetric analysis Materials science Scanning electron microscope General Chemical Engineering General Engineering General Physics and Astronomy Infrared spectroscopy 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Capacitance 0104 chemical sciences X-ray photoelectron spectroscopy Chemical engineering Specific surface area Electrode General Materials Science 0210 nano-technology |
Zdroj: | Ionics. 26:5189-5197 |
ISSN: | 1862-0760 0947-7047 |
DOI: | 10.1007/s11581-020-03649-8 |
Popis: | Searching for new metal–organic frameworks with excellent electrochemical performances is considerably important to advance their application in supercapacitors. Herein, a Co5-cluster-based three-dimensional (3D) metal–organic framework (Co5(OH)2(O2CCH3)8·2H2O, Co5-MOF) was synthesized and characterized by X-ray powder diffraction, infrared spectroscopy, thermogravimetric analysis, X-ray photoelectron spectroscopy, scanning electron microscopy, and nitrogen adsorption–desorption. The Co5-MOF as an electrode material of supercapacitors was investigated for the first time. In a three-electrode system, the highest specific capacitance for the Co5-MOF electrode is 867 F g−1 at 1 A g−1, and the specific capacitance still remains 90.3% of the original specific capacitance after 3000 cycles, displaying its good long-term cycle stability. The asymmetric supercapacitor based on the Co5-MOF as the positive electrode and the rGO as the negative electrode presented a high energy density of 18 W h kg−1 at a power density of 0.7 kW kg−1. The high supercapacitive properties may be attributed to the nano-sized Co5-MOF particles with larger specific surface area and pore structure. |
Databáze: | OpenAIRE |
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