(532ch) Highly Active Multifunctional Lanthanum Perovskite Electrocatalysts (LaMnxCo1-XO3 (0?x?1)) By Tuning the Mn to Co Ratio in Alkaline Medium

Lanthanum-based perovskites (LaMn_xCo_1-xO₃ (0≤x≤1)) were synthesized using a solution combustion synthesis technique with variable ratios of Co and Mn to investigates the surface property and electrocatalytic characteristics (stability and activity of catalyst) for methanol oxidation reaction (MOR), oxygen reduction reaction (ORR), and oxygen evolution reaction (OER) under alkaline medium (KOH). The structural, chemical and morphological characterizations of the synthesized catalyst were peformend by XRD, FTIR, SEM, TEM and XPS techniques as a function of Mn:Co elemental ratio. The time temperature profile during combustion process was also monitored to study the completion of combustion reaction and to understand its impact on the structure of the perovskites. SEM/EDX and XPS analysis confirmed the formation of targeted ratio of Mn and Co on the catalyst. Cyclic voltammetry (CV) and linear sweep voltammetry (LSV) results revealed that all perovskite samples with different Co:Mn ratios were active for ORR, OER and MOR. The LaMn_xCo_1-xO₃ perovskite with x=0.4 showed the highest current density compared to the other samples towards all the electrocatalytic reactions under alkaline reaction conditions.