Metal Organic Framework Derived Electrocatalysts for Oxygen Reduction Reaction (ORR) and Oxygen Evolution Reaction (OER) in Metal Air Batteries.

Abstract

It is vital to synthesize non-noble metal-based electrocatalysts with bifunctional electrocatalytic activity for both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) to make it possible for metal air batteries to be highly efficient and sustainable. This will allow for the use of metal air batteries. In this research, a pure FeCo-MOF, a pure MnFeCo-MOF, and their composites with (1, 3, 5) wt% rGO were synthesized through the solvothermal technique and characterized via XRD, SEM, EDX, FTIR, and RAMAN. The electrochemical process is made more efficient thanks to the synergistic relationship between the MOF and the rGO composites. In this research project, Mn-doped Fe/Co MOF and its rGO-based composites were produced and tested as electrocatalysts for oxygen evolution reactions (OER). X-ray diffraction (XRD) and scanning electron microscopy (SEM) were utilized to conduct an investigation into the structural and morphological characteristics of the materials that were manufactured. Cyclic voltammetry (CV) and linear sweep voltammetry (LSV) were utilized to study the electrochemical performance of the materials. When compared to the individual components, the 3 wt% rGO MnFeCo-MOF composites exhibited much higher OER catalytic activity than the individual components. The improved composite demonstrated remarkable electrocatalytic activity, outstanding durability, and satisfactory stability in alkaline solutions. It was determined that the synergistic impact of MnFeCo-MOF and rGO was responsible for the improved electrocatalytic performance of the composites. This effect resulted in improved electronic conductivity, enhanced active sites, and reduced charge transfer resistance. According to these findings, FeCo-MOF, MnFeCo-MOF and its rGO composites have a significant amount of promise for use in metal-air batteries as effective electrocatalysts for OER.