Journal
NANO ENERGY
Volume 8, Issue -, Pages 133-140Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2014.06.007
Keywords
Metal organic framework; Fe3O4; Composite; Supercapacitor; Temperature effect
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Funding
- Early Career Scheme of the Research Grants Council of Hong Kong SAR, China [CityU 9041977]
- Science Technology and Innovation Committee of Shenzhen Municipality [R-IND4901]
- City University of Hong Kong [7200337]
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In this paper, we report a porous Fe3O4/carbon composite supercapacitor electrode material possessing great temperature variation-resistive long-term cycle stability. The material is prepared via a facile one-step calcination of an iron-based metal organic framework (Fe-MOF) template and composed of porous Fe3O4 nanoparticles and carbon as a result of a well-controlled incomplete annealing process of the MOF template. With this material as an electrode, a specific capacitance of 139 F g(-1) at a discharging current density of 0.5 A g(-1) can be achieved. More attractively, the specific capacitance is significantly increased when the working temperature is elevated from 0 to 60 degrees C. Furthermore, even after 4000 cycles of charge-discharge at varied temperatures, 83.3% of the capacitance of the electrode material is retained, showing excellent temperature variation-resistive long-term cycle stability of the prepared composite electrode material. (C) 2014 Elsevier Ltd. All rights reserved.
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