Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 553, Issue -, Pages 350-357Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2012.11.122
Keywords
Ferrite; Polymer nanocomposites; X-ray diffraction; Scanning electron microscopy; Electrochemistry; Specific capacitance
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Funding
- Department of Science and Technology (DST-SERB), Government of India [SR/FTP/PS-80/2009]
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Nanosized PANI-NiFe2O4 composites were prepared by in situ-chemical oxidative polymerization method, whereas NiFe2O4 was synthesized by solution combustion synthesis (SCS) technique. Structural, morphological and electrochemical properties of NiFe2O4, PANI and PANI-NiFe2O4 composites were characterized by XRD, FT-IR, TGA, SEM, TEM, cyclic voltammetry, and galvanostatic charge-discharge techniques. The crystalline nature of NiFe2O4 and PANI-NiFe2O4 composites was elucidated by X-ray diffraction. FT-IR spectra inferred the polymerization of aniline and revealed the corresponding functional groups of PANI. Cyclic voltammetry and galvanostatic charge-discharge experiments were carried out to study the electrochemical capacitive properties. The PANI-NiFe2O4 composites (NP1, NP2 and NP3) exhibited enhanced capacitive performance due to the increase in conducting network of PANI. The composite NP1 was provided higher SC of 448 F/g compared to PANI (292 F/g) and other PANI-NiFe2O4 composites. For the sample NP1, maximum energy density of 50.4 Wh/kg was observed at a current density of 1 mA/cm(2). Above 80% of capacitance was maintained after 1000 cycles at a higher current density of 10 mA/cm(2). Hence, the prepared PANI-NiFe2O4 composites can be used as suitable electrode materials for redox supercapacitors. (C) 2012 Elsevier B.V. All rights reserved.
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