Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 466, Issue -, Pages 291-296Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2015.12.024
Keywords
Energy storage; Supercapacitor; Fe2O3 hollow nanoshuttles; Temperature effect
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Funding
- National Major Research Program of China [2013CB932602]
- Program of Introducing Talents of Discipline to Universities [B14003]
- National Natural Science Foundation of China [51527802, 51232001, 51372023]
- Beijing Municipal Science & Technology Commission
- Fundamental Research Funds for Central Universities
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The design and optimization of supercapacitors electrodes nanostructures are critically important since the properties of supercapacitors can be dramatically enhanced by tunable ion transport channels. Herein, we demonstrate high-performance supercapacitor electrodes materials based on alpha-Fe2O3 by rationally designing the electrode microstructure. The large solid-liquid reaction interfaces induced by hollow nanoshuttle-like structures not only provide more active sites for faradic reactions but also facilitate the diffusion of the electrolyte into electrodes. These result in the optimized electrodes with high capacitance of 249 F g(-1) at a discharging current density of 0.5 A g(-1) as well as good cycle stability. In addition, the relationship between charge storage and the operating temperature has been researched. The specific capacitance has no significant change when the working temperature increased from 20 degrees C to 60 degrees C (e.g. 203 F g(-1) and 234 F g(-1) at 20 degrees C and 60 degrees C, respectively), manifesting the electrodes can work stably in a wide temperature range. These findings here elucidate the alpha-Fe2O3 hollow nanoshuttles can be applied as a promising supercapacitor electrode material for the efficient energy storage at various potential temperatures. (C) 2015 Elsevier Inc. All rights reserved.
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