In the current scenario of innovative energy systems, reversible solid oxide cells (r-SOCs) are widely recognized as promising devices, thanks to their high conversion efficiency in both power-to-fuel and fuel-to-power modes. A crucial aspect for their scale-up is the development of multi-functional compounds that can work as either air or fuel electrodes. The most reliable alternative to conventional materials for r-SOCs are perovskite oxides. Sr -substituted lanthanum ferrites (LSF) show large mixed ionic and electronic conductivity (MIEC) and versatile catalytic activity upon B-site doping. Nevertheless, their poor stability in highly reducing environments precludes their widespread application. In this work, 5 mol% Ru-doped lanthanum ferrite La0.6Sr0.4Fe0.95Ru0.05O3-delta (LSFR05) is investigated as a multi-functional electrode for reversible and symmetric solid oxide cells (r-SSOCs). Ru-doping promotes LSF stability, retaining a higher lattice oxygen content. Upon reduction, LSFR05 exhibits exsolution of uniformly dispersed catalytically active Fe-Ru nanoparticles. All-perovskite symmetric cells showed remarkably high power density as H2-SOFC at 850 degrees C (602 mW cm-2), while in CO2-SOEC mode a current density output of 1.39 A cm-2 at 1.5 V was obtained. With a standard 70:30 CO2:CO gas composition, the cell showed a polarization resistance as low as 165 m omega cm2. The complete SOFC-SOEC reversibility was suc-cessfully assessed for over 200 h.

Marasi, M., Duranti, L., Luisetto, I., Fabbri, E., Licoccia, S., Di Bartolomeo, E. (2023). Ru-doped lanthanum ferrite as a stable and versatile electrode for reversible symmetric solid oxide cells (r-SSOCs). JOURNAL OF POWER SOURCES, 555 [10.1016/j.jpowsour.2022.232399].

Ru-doped lanthanum ferrite as a stable and versatile electrode for reversible symmetric solid oxide cells (r-SSOCs)

Duranti L.
;
Licoccia S.;Di Bartolomeo E.
2023-01-30

Abstract

In the current scenario of innovative energy systems, reversible solid oxide cells (r-SOCs) are widely recognized as promising devices, thanks to their high conversion efficiency in both power-to-fuel and fuel-to-power modes. A crucial aspect for their scale-up is the development of multi-functional compounds that can work as either air or fuel electrodes. The most reliable alternative to conventional materials for r-SOCs are perovskite oxides. Sr -substituted lanthanum ferrites (LSF) show large mixed ionic and electronic conductivity (MIEC) and versatile catalytic activity upon B-site doping. Nevertheless, their poor stability in highly reducing environments precludes their widespread application. In this work, 5 mol% Ru-doped lanthanum ferrite La0.6Sr0.4Fe0.95Ru0.05O3-delta (LSFR05) is investigated as a multi-functional electrode for reversible and symmetric solid oxide cells (r-SSOCs). Ru-doping promotes LSF stability, retaining a higher lattice oxygen content. Upon reduction, LSFR05 exhibits exsolution of uniformly dispersed catalytically active Fe-Ru nanoparticles. All-perovskite symmetric cells showed remarkably high power density as H2-SOFC at 850 degrees C (602 mW cm-2), while in CO2-SOEC mode a current density output of 1.39 A cm-2 at 1.5 V was obtained. With a standard 70:30 CO2:CO gas composition, the cell showed a polarization resistance as low as 165 m omega cm2. The complete SOFC-SOEC reversibility was suc-cessfully assessed for over 200 h.
30-gen-2023
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore ING-IND/22 - SCIENZA E TECNOLOGIA DEI MATERIALI
English
Ru-doping; Perovskite; Exsolution; Reversible solid oxide cells; Symmetric solid oxide cells; CO2 reduction
Marasi, M., Duranti, L., Luisetto, I., Fabbri, E., Licoccia, S., Di Bartolomeo, E. (2023). Ru-doped lanthanum ferrite as a stable and versatile electrode for reversible symmetric solid oxide cells (r-SSOCs). JOURNAL OF POWER SOURCES, 555 [10.1016/j.jpowsour.2022.232399].
Marasi, M; Duranti, L; Luisetto, I; Fabbri, E; Licoccia, S; Di Bartolomeo, E
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/317957
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