Available online at www.sciencedirect.com ScienceDirect Materials Today: Proceedings 4 (2017) 5651–5656 www.materialstoday.com/proceedings 2214-7853 © 2017 Elsevier Ltd. All rights reserved. Selection and Peer-review under responsibility of INTERNATIONAL CONFERENCE ON MULTIFUNCTIONAL MATERIALS FOR DEVICE APPLICATIONS(ICMDA-2016). ICMDA 2016 CFO-Graphene nano composite for High Performance Electrode Material Sweety Supriya*, Sunil Kumar and Manoranjan Kar Department of physics, Indian Insitute of technology Patna, Bihta-801103, Patna, India Abstract CoFe 2 O 4 -graphene nanocomposite with different graphene content (5, 10 and 15 wt%) were synthesized by the high energy planetary Ball mill method using zirconium coated steel balls with a speed of 300 rpm for 24 hours. The structural properties and molecular vibrations or rotations of the material were studied by the XRD and Raman spectroscopy respectively. The electrical impedance (Zˈ) characterization reveals the increase in ac conductivity (σ ac ) with the increase in graphene percentage in the composite as compared to pure cobalt ferrite. The conducting nature of graphene is also being reflected by the Nyquist plot. It is very interesting to note that the combination of CoFe 2 O 4 nanoparticles with graphene results in a dramatic conversion of the inactive CoFe 2 O 4 into a highly conductive composite, which is suited as electrode material in energy storage devices (supercapacitors, batteries, fuel cells and solar cells). The significant enhancement in conductivity under the applied electric field of 2 V (peak to peak) and frequency range 1 Hz to 1 MHz has been observed at room temperature due to addition of graphene in the CoFe 2 O 4 . © 2017 Elsevier Ltd. All rights reserved. Selection and Peer-review under responsibility of INTERNATIONAL CONFERENCE ON MULTIFUNCTIONAL MATERIALS FOR DEVICE APPLICATIONS(ICMDA-2016). Keywords: ac conductivity; Ball millin; Cobalt ferrite; Impedance; XRD. Corresponding author Email address: sweety@iitp.ac.in