Oxygen reduction reaction of manganese oxide/graphene oxide nanocomposite

Abstract

MnO₂/graphene oxide composite coating has been prepared by electrochemical anodic deposition method. Optimization of current density and deposition efficiency is reported. The formation of α-MnO₂/graphene oxide nanocomposite is elucidated through X ray diffraction and infrared reflection measurements. Morphological studies reveal the increase in porosity and exfoliation of graphene oxide by MnO₂ particles. The extent of oxygen reduction reaction occurring at the surface of MnO₂/graphene oxide composite coating have been analyzed by cyclic voltammetry and electrochemical impedance spectroscopy in aqueous 1 M Li₂SO₄ solution. The composite coating is observed to possess better catalytic properties towards oxygen reduction.