Kinetics and thermodynamics of carbonation of a promising SOFC cathode material La0.5Ba0.5CoO3−δ (LBC)

Abstract

This work examines the reactivity of a potentially promising SOFC cathode material, La_0.5Ba_0.5CoO_3−δ (LBC), under CO₂ atmosphere. Through a combination of different techniques – thermogravimetric analysis, ex situ XRD analyses of reacted products, and in situ XRD analysis – the reaction pathway and kinetics for LBC carbonation is investigated. The thermodynamic phase boundary for carbonate formation in the LBC–CO₂ system has been generated and fundamental thermodynamic parameters – the standard state enthalpy (ΔH°) and the standard state entropy (ΔS°) – are determined.