Optimizing cathode materials for intermediate-temperature solid oxide fuel cells (SOFCs): Oxygen reduction on nanostructured lanthanum nickelate oxides
By Carneiro, Juliana Silva Alves; Brocca, Roger Antunes; Lucena, Max Laylson Ribeiro Sampaio; Nikolla, Eranda
Published in Applied Catalysis B: Environmental
NULL
2017
Abstract
Abstract Kinetics of high temperature oxygen reduction reaction (ORR) on La2NiO4 + ? (LNO) nanostructures are investigated by means of electrochemical impedance spectroscopy, with the aim of determining (i) the critical steps that govern {ORR} in these catalysts, and (ii) ways to lower the overpotential losses associated with these steps. We have identified two main electrochemical processes that govern the polarization resistances during ORR: the electron transfer/oxygen vacancy healing ( O a d s + 2 e ? + V O ? ? ? O O ( L N O ) X ) , and the oxygen ion transfer through the electrocatalyst/electrolyte interface ( O O ( L N O ) X + V O ? ? ? O O ( Y S Z ) X ) . We find that the nanostructure of {LNO} significantly effects the activation barriers associated with these processes with nanorod
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