(532ch) Highly Active Multifunctional Lanthanum Perovskite Electrocatalysts (LaMnxCo1-XO3 (0?x?1)) By Tuning the Mn to Co Ratio in Alkaline Medium
AIChE Annual Meeting
2022
2022 Annual Meeting
Catalysis and Reaction Engineering Division
Poster Session: Catalysis and Reaction Engineering (CRE) Division
Wednesday, November 16, 2022 - 3:30pm to 5:00pm
Lanthanum-based perovskites (LaMnxCo1-xO3 (0â¤xâ¤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 LaMnxCo1-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.