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

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. (c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

This work investigates the electrocatalytic reduction of carbon dioxide using polymerized Co-4-pyridylporphyrin in the presence of electrochemically reduced graphene oxide. The polymeric porphyrin was synthesized through a metalation process using the solvent system CHCl3-CH3OH. Electrocatalysts and comparison materials were synthesized by electrochemical or chemical reduction of graphene oxide with or without porphyrin. Characterization techniques including XPS, SEM, HR-TEM, Raman spectroscopy, and EIS were employed. Kinetic studies using a rotating disk electrode revealed a 4-electron reduction pathway under alkaline conditions.