Ternary Ni–Co–Fe Exsolved Nanoparticles/Perovskite System for Energy Applications: Nanostructure Characterization and Electrochemical Activity

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

ACS Applied Energy Materials

American Chemical Society

Año: 2020 vol. 3 p. 9528 - 9533

2574-0962

ABSTRACT: The exsolution of Ni − C o − Fe from aSr0.93(Ti0.3Fe0.56Ni0.07Co0.07)O3−δ perovskite (STFNC) is explored as a strategyto produce electrochemically active electrodes for symmetric-SOFC (S-SOFC).It was found that a nanostructured NiCoFe ternary alloy phase, withapproximately equal amounts of each metal, can be formed by this method.The STFNC electrode is studied via electrochemical impedance spectroscopy,showing a really interesting potential as S-SOFC electrode: the anodepolarization resistance was 1.12 Ω·cm2 in a wet 10%H2 atmosphere at 700°C (exsolving in situ the NiCoFe phase), and the cathode polarization resistanceat 700 °C in air was 0.054 and 0.042 Ω·cm2, before and after exsolution,respectively