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Title: Electrocatalytic properties of cobalt ferrites obtained by glycine sol-gel route for oxygen evolution in alkaline medium
Authors: Yadav, Ritu
Singh, Narendra Kumar
Keywords: Electrocatalysis;Nanoparticles;Spinel ferrites;Ferrites;Cobalt ferrites;Sol-gel method;Oxygen evolution
Issue Date: 21-Oct-2015
Publisher: NISCAIR-CSIR, India
Abstract: Nano-sized cobalt ferrites have been synthesised by novel sol-gel auto combustion route using a mixture of glycine and ammonium nitrate as fuel with stoichiometric ratio of metal nitrates. The materials so obtained, are characterized by X-ray diffraction, scanning electron micrographs and IR data. Preliminary study shows the formation of spinel phase of the material along with some impurity. Cyclic voltammetry and anodic polarization of each oxide have been carried out in the form of electrode on Ni-substrate. The CV curve of each oxide electrode exhibits redox peaks (EPa = 480±12 mV and EPc = 362±6) prior to the oxygen evolution reaction. The anodic polarization curve of each oxide electrode has been recorded in 1 M KOH at 25 °C for the determination of electrocatalytic activity. Among the prepared oxides, the activity is highest with 1.0 mol Co-substitution in Fe3O4 matrix. The most active oxide electrode shows overpotential 503 mV at 100 mA cm-2 current density. Tafel slope values range from 47-59 mV decade-1. The activation energy has also been estimated by recording the anodic polarization curve at different temperatures.
Page(s): 1221-1225
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.54A(10) [October 2015]

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