Dioxygen reduction using electrochemically reduced graphene oxide - Polymerized cobalt-4-pyridylporphyrin composite

Abstract

The present work describes the electrocatalytic reduction of dioxygen using polymerized Co-4-pyridylporphyrin in presence of electrochemically reduced graphene oxide. The polymeric porphyrin was synthesized by following the metalation procedure using the solvent system CHCl3–CH3OH. The electrocatalyst and the materials for comparison were synthesized by electrochemical as well as chemical reduction of graphene oxide either in the presence or in the absence of porphyrin. These materials were characterised by XPS, SEM, HR-TEM, Raman spectral and EIS techniques. The studies on the kinetics of ORR using rotating disk electrode showed the reduction through a 4-electron pathway under alkaline conditions.