Surfactant assisted synthesis of SrFe 10 Al 2 O 19 : Magnetic and Supercapacitor ferrite
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Surfactant assisted synthesis of SrFe10Al2O19: Magnetic and Supercapacitor ferrite D. Neupane, H. Adhikari, B. Sapkota, J. Candler, R. Gupta and S. R. Mishra MRS Advances / FirstView Article / July 2016, pp 1 - 8 DOI: 10.1557/adv.2016.487, Published online: 28 June 2016
Link to this article: http://journals.cambridge.org/abstract_S2059852116004874 How to cite this article: D. Neupane, H. Adhikari, B. Sapkota, J. Candler, R. Gupta and S. R. Mishra Surfactant assisted synthesis of SrFe10Al2O19: Magnetic and Supercapacitor ferrite. MRS Advances, Available on CJO 2016 doi:10.1557/adv.2016.487 Request Permissions : Click here
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MRS Advances © 2016 Materials Research Society DOI: 10.1557/adv.2016.487
Surfactant assisted synthesis of SrFe10Al2O19: Magnetic and Supercapacitor ferrite D. Neupane1, H. Adhikari1, B. Sapkota1, 2, J. Candler3, R. Gupta3, and S. R. Mishra1 1. Department of Physics, The University of Memphis, Memphis, TN 38152, USA 2. Department of Physics, Northeastern University, Boston, MA 602115, USA 3. Department of Chemistry, Pittsburg State University, Pittsburg, KS 66762, USA ABSTRACT The aluminum doped SrFe12O19 hexaferrite samples were prepared via co-precipitation method using cetyltrimethyl ammonium bromide (CTAB) as a surfactant. The effects of CTAB content (x = 0, 1, 3, 6 and 9 wt. %) on the structure, morphology, and electrocapacitive behavior of the SrFe10Al2O19 nanoparticles were investigated. The use of CTAB was observed to be effective in eliminating α-Fe2O3 phase from samples. Morphological changes including grain and crystallite size was noticed with the increase in the CTAB content. With the increase in CTAB, powder particles grew in size and thickness. A concomitant increase in magnetization due to crystal growth was observed. Electrochemical performance of supercapacitors was evaluated by cyclic voltammetry (CV). Highest power density of 368.09 WKg-1 and energy density of 0.916 WhKg-1 was observed for 3% and 1% CTAB samples, respectively. INTRODUCTION Electrocapactiors are attractive as they can simultaneously provide high power density and energy density. Generally, electrocapacitive materials are divided into two categories as per their charge storage mechanism. The electrical double layer capacitor (EDLCs) utilizes the electrostatic separation of charges at the electrode/electrolyte interface, which has a direct dependence on the surface area of materials [1]. While pseudocapacitors store energy via charge transfer through surface Faradaic redox reaction between electrode and electrolyte. Various strategies have been adapted to increase surface area and relative permittivity of electrodes due to their direct influence on capacitance [2]. Iron containing compound, ferrites are categorized into spinels, hexagonal ferrites and garnets. They have promising potential and are ine
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