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.
