Green synthesis of palladium nanoparticles–graphene hybrids as efficient electrode materials for electrochemical double layer capacitors

4^th International Conference and Exhibition on Materials Science & Engineering

September 14-16, 2015 Orlando, USA

Riyaz Ahmad Dar and Ashwini Kumar Srivastava

University of Mumbai, India

Posters-Accepted Abstracts: J Material Sci Eng

Abstract :

A composite of palladium (Pd) nanoparticles decorated Graphene Nanosheets (GNS) was synthesized in a single step by the simultaneous reduction of Graphene Oxide (GO) and palladium chloride from the aqueous phase using ascorbic acid as reducing agent. The palladium nanoparticles�graphene hybrids (Pd�GNS) are characterized by high resolution scanning electron microscopy, transmission electron microscopy, Raman, Fourier transform infrared, X-ray diffraction, and energy dispersive X-ray spectroscopy, which demonstrate that the metal nanoparticles have been uniformly deposited on the surfaces of graphene nanosheets. The synthesized material has been analyzed by cyclic voltammetry, electrochemical impedance spectrometry and chrono-potentiometry using 1 M KCl as the supporting electrolyte for its application as electrochemical double layer supercapacitors. Results showed that the Pd/GNS nanocomposite displayed superior capacitive performance with large capacitance (637 Fg-1), excellent cyclic performance, and maximum energy and power densities of 56 W.h.kg-1 and 1166 W.kg-1, respectively at a current density of 1.25 Ag-1. This highlights the importance of anchoring small Pd nanoparticles on graphene sheets for maximum utilization of electrochemically active Pd nanoparticles and graphene for energy storage applications in supercapacitors.

Biography :

Email: riyazabid.2008@rediffmail.com