Metal Organic Framework (MOF) Derived Nanostructured Composite @ Reduced Graphene Oxide as an Efficient Electrocatalyst for Oxygen Reduction Reactions /

Abstract

Energy storage devices have the potential to play a significant part in the restructuring of the energy sector by delivering an inexpensive, accessible, and reliable source of energy directly at the point of demand while likewise reducing the load on the central power grid. Due to their limited energy densities and capacities, lithium-ion batteries (LIBs) are considered inadequate to address expanding energy storage demands. Metal air batteries (particularly Li-air batteries) are a relatively new technology that has gained attention due to its potentially high energy densities and novel cell designs. When it comes to the oxygen reduction reactions that underlie the processes during discharge and charge cycles, poor electrocatalyst materials severely affect the impressive theoretical energy densities of Liair

batteries (LABs), which is roughly twenty times the density of commercial Li-ion batteries (LIBs). To solve its performance difficulties, a electrocatalyst that is efficient, stable, and long-lasting is required. A manganese metal organic framework and graphene oxide nanostructured composite was prepared in this study using a simple solvothermal approach followed by thermal reduction in an inert atmosphere. One nanostructured composite with 30% rGO (MnBDC@30% rGO) excels the majority of recently described catalysts in terms of electrocatalytic property and electroactivity. Electrochemical tests of Mn/Zn-N-C @30% rGO show significant cathodic peak potentials, onset, and half wave, as well as acceptable current densities. It exhibits excellent ORR performance in terms of low overpotential, material degradation, high methanol tolerance, and long-term stability, which can be attributed to a synergistic effect between the mesoporous and highly defective catalyst surface, as well as the transition metal organic framework and rGO chemistries.