Journal of Materials, Processes and Environment
Volume 4, Numéro 2, Pages 81-84
2016-12-04
Morphology And Electrocatalytical Activity Of The Composite Electrode (gc/ppy(ni0.3co2.7o4)) Synthesized By Galvanostatic And Cyclic Voltammetry Methods
Authors : Belkessam Celia . Mechouet M. . Djilali N. . Idiri N. . Kadri A. .
Abstract
The Polypyrrole (Ppy) and mixed valence Ni0.3Co2.7O4 nanoparticles were used essentially to elaborate the composite electrode (GC/Ppy(Ni0.3Co2.7O4)) by galvanostatic and cyclic voltammetry (CV) methods. Electrololymerization of Pyrrole (Py) in the absence and in the presence of the oxide was performed on glassy carbon (GC) electrode in KCl (0.15 mol/L). The obtained materials morphologies and behavior towards the oxygen reduction reaction (ORR) were then checked. The result reveals that the Ppy film electrodeposition signal and its surface morphology were affected by the oxide presence in the synthesis medium and the formed hybrid materials exibit electrocatalytical properties whatever, the processing route used.Both cyclic voltammetry and galvanostatic methods lead to potential decrease. Furthermore, the incorporation of oxide into polymeric matrix increases its porosity allowing easier charges transfer and higher accessible active sites. Moreover, the SEM photographs reveal a porous film containing inhomogenously dispersed nanoparticles when galvanostatic method is used. However GC/Ppy(Ni0.3Co2.7O4) obtained by CV, are porous and a sponge-like structure with Ni0.3Co2.7O4 particles uniformly distributed in the film surface with few areas appearing agglomeration.
Keywords
Cyclic voltammetry, composite material, galvanostatic, oxygen reduction reaction,
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