Preparation and electrochemical performance of porous hematite (alpha-Fe2O3) nanostructures as supercapacitor electrode material

Shivakumara, S and Penki, Tirupathi Rao and Munichandraiah, N (2014) Preparation and electrochemical performance of porous hematite (alpha-Fe2O3) nanostructures as supercapacitor electrode material. In: JOURNAL OF SOLID STATE ELECTROCHEMISTRY, 18 (4). pp. 1057-1066.

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Abstract

Porous alpha-Fe2O3 nanostructures have been synthesized by sol-gel route. The effect of preparation temperature on the morphology, structure, and electrochemical stability upon cycling has been studied for supercapacitor application. The discharge capacitance of alpha-Fe2O3 prepared at 300 A degrees C is 193 F g(-1), when the electrodes are cycled in 0.5 M Na2SO3 at a specific current of 1 A g(-1). The capacitance retention after 1,000 cycles is about 92 % of the initial capacitance at a current density of 2 A g(-1). The high discharge capacitance as well as stability of alpha-Fe2O3 electrodes is attributed to large surface area and porosity of the material. There is a decrease in specific capacitance (SC) on increasing the preparation temperature. As iron oxides are inexpensive, the synthetic route adopted for alpha-Fe2O3 in the present study is convenient and the SC is high with good cycling stability, the porous alpha-Fe2O3 is a potential material for supercapacitors.

Item Type:	Journal Article
Publication:	JOURNAL OF SOLID STATE ELECTROCHEMISTRY
Publisher:	SPRINGER
Additional Information:	Copyright for this article belongs to the SPRINGER, USA
Keywords:	Iron oxides; Porous nanostructures; Supercapacitors
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	13 May 2014 11:34
Last Modified:	13 May 2014 11:34
URI:	http://eprints.iisc.ac.in/id/eprint/48974

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