Modulation of Tolerance Factor and Vacant Oxygen Holes of Doped and Undoped Lanthanum Oxides Toward Electrocatalytic Oxygen Evolution Reactions: Perovskites Versus Nonperovskites Materials

Abstract Escalating global demands for sustainable and clean energy urges the conception of pivotal strategies to revolutionize the electrochemical oxygen evolution (OER) mechanisms by engineered efficiency routes. This study investigates the key differences and the resulting effects of doped and undoped perovskites oxides, strontium doped lanthanum and cerium oxides (SrCeLa 2 O 3 ) (A = La, B = Ce) and lanthanum and cerium oxides (CeLa 2 O 3 ) comparatively to nonperovskites materials. The underlying low impactful nonperovskites such as strontium‐doped lanthanum oxides (SrLa 2 O 3 ) and lanthanum oxides (La 2 O 3 ) are opted in comparison to check the efficiency parameters and ongoing overpotential dominated OER problems. The electrochemical evaluation trends in relation to overpotential, Tafel plots, double layer capacitance ( C dl ), tolerance factor, metal oxygen covalency (MOC), and vacant oxygen reserves are revealed with excellent outputs. Among all the operating variants, CeLa 2 O 3 performed remarkably different comparatively to nonperovskites achieving a current density of 50 mAcm −2 at an overpotential of 380 mV for OER. This study also reveals the average electrocatalytic behavior of non‐perovskites (SrLa 2 O 3 and La 2 O 3 ) mainly due to absence of B‐site cation (Ce) and lack of oxygen vacancies for a continuous redox flow likely observed for CeLa 2 O 3 and SrCeLa 2 O 3 . These findings deepen the understanding of perovskites tunability and their varying OER performances in comparison to nonperovskites and position CeLa 2 O 3 and SrCeLa 2 O 3 as tenable catalysts for sustainable energy production.