Effect of temperature in the process of Ni-Fe exsolution from Sr(Ti,Fe,Ni)O3 solid oxide fuel cells electrodes and its impact in the hydrogen oxidation reaction

MOGNI, LILIANA V.; TROIANI, HORACIO E.; MARIANO SANTAYA

Buenos Aires

Congreso; VIII Symposium on Hydrogen, Fuel Cells and Advanced Batteries, HYCELTEC 2022; 2022

Universidad de Buenos Aires

Solid Oxide Fuel Cells (SOFC) are energy generation devicesthat oxidize a fuel to produce electricity, also generatinghigh-quality heat in the process. Their remarkable conversionefficencies and high fuel flexibility make themstand out as one of the most promising technologies forgreen power generation. In recent years, mixed ionic andelectronic conductor (MIEC) oxides have been proposed ascandidates for SOFC electrodes due to their good toleranceto fuel impurities and high stability under C-based fuels.Although the electro-catalytic activity of MIEC anodes forhydrogen oxidation is generally lower than that of state-ofthe-art Ni cermet anodes, their performance can be dramaticallyimproved by functionalization of the the MIECoxide surface with catalytically active nanoparticles (NPs).In this sense, exsolution is a very promising technique thatconsists in the controlled demixing of transition metalscontained in the host oxide that, under the effect of a reducingatmosphere, diffuse to the surface and form homogeneouslydistributed metallic nanoparticles.