Title : Effect of substitution over a series of Lanthanum Perovskites for oxygen evolution reaction
Abstract:
On behalf of the energy crisis, catalysis frontiers have been focusing on developing high-efficient and low-cost oxygen evolution reaction (OER) catalysts in order to get better activity and stability for energy conversion and storage (ECS) devices. OER plays a vital role in ECS devices as it provides electrons for other half reactions in ECS devices. La0.85Sr0.15CoO3 (LSCO) perovskite is the best choice for selecting a substitute (Rh, Pt, Ru, and Pd) noble metal to get the desired OER activity. La0.85Sr0.15Co1−yMyO3 (M = Rh, Pt, Ru, and Pd) 1 perovskites were synthesized by the solution combustion method, and complete characterization was performed followed by electrocatalytic investigation for OER. In this work, owing to the best activity from Rh substituted LSCO for OER. We have synthesized 1, 2.5, and 5% Rh substituted LSCO by the solution combustion method, followed by XRD, FE-SEM, elemental mapping, EDX, XRF, and XPS analysis. It’s necessary to perform XPS studies for LSRh0.025CO of pre- and post OER by chronoamperometry after getting the best result from 2.5% Rh LSCO in both 0.5M KOH and buffer media. The electrochemical surface area of LSRh0.025CO is 2.2 times larger compared to LSCO. Normalizing the steady state current density with the ECSA, the LSRh0.025CO is still anticipated to be 2 times higher than the LSCO.
