Alkaline Stability of LaBO₃ (B = Co, Ni, Mn, and Fe) Perovskites and Their Application as Bifunctional Oxygen Electrocatalysts for Electrochemical Devices.

ABSTRACT: Transition metal perovskites and derived compositions have long been suggested as electrocatalysts for the oxygen electrochemical reactions in alkaline media. This paper presents a study of the alkaline stability of LaBO₃ perovskites (B = Co, Ni, Mn, and Fe) by exposing powdered samples to a 2M NaOH solution with pH > 14 for variable periods of time. The elemental analysis of the supernatant test solution reveals the presence of Fe only after 48 h reaction time, whereas Co is apparent within the first 12 h. Ni and Mn are detected after 24 h in quantities like those obtained for Co after 12 h. These data suggest that the initial dissolution is primarily determined by the nature of the transition metal, in excellent agreement with calculated Pourbaix equilibrium diagrams. The anal

SUBMITTER: Gutru R 

PROVIDER: S-EPMC12821133 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature