Electrocatalytic Activity towards Oxygen Reduction of Electropolymerized Cobalt Porphyrin Doped with Ionic-Liquid-Functionalized Graphene

Electropolymerized films of Coatetetra(4-hydroxyphenyl)porphyrin doped with ionic-liquid-functionalized graphene were obtained by a simple one-step preparation procedure. Spectroscopic (UV-Vis., Raman), microscopic (AFM, SEM), and electrochemical methods were used to characterize the films. The composite films show considerable lower H2O2 yields and at more positive potentials for O-2 reduction, as compared to the undoped ones. Stability during king-term use of films applied on electrodes, including porous ones, allow to consider them as possible non-noble catalyst based O-2 reduction cathodes in fuel cells. (C) 2015 The Electrochemical Society. All rights reserved.