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Novel composite fuel electrode for CO2/CO-RSOCs

Authors :
Silvia Licoccia
Leonardo Duranti
Igor Luisetto
E. Di Bartolomeo
Cadia D'Ottavi
Duranti, L.
Luisetto, I.
Licoccia, S.
D'Ottavi, C.
Di Bartolomeo, E.
Publication Year :
2021
Publisher :
IOP Publishing Ltd, 2021.

Abstract

Reversible solid oxide cell (RSOC) technology allows use of a single device to efficiently derive chemicals from power (power-to-fuel) and power from chemicals (fuel-to-power). Fuel flexibility is a key aspect, as developing SOCs able to operate on fuels other than hydrogen can ease their integration into existing infrastructure. In addition, H2O and/or CO2 reduction is favorable in SOECs as polarization losses are reduced at high temperature. Here, a composite fuel electrode, 60 wt.% La0.6Sr0.4Fe0.8Mn0.2O3-δ (LSFMn) and 40 wt.% (5 wt.% Ni)-containing Ce0.85Sm0.15O2-δ (Ni-SDC) was investigated in H2-fueled, CO-fueled SOFCs and for CO2 reduction in SOEC mode. In reducing conditions, Fe exsolved from the LSFMn perovskite formed a Ni-Fe alloy with Ni present on SDC. The composite fuel electrode showed remarkable activity for CO2 reduction with a current density output of 1.40 A cm-2 (1.5 V) at 850 °C. SOFC/SOEC cell reversibility was obtained in different CO2:CO mixtures. Electrochemical impedance spectroscopy analysis was used to better understand cell mechanisms in SOFC and SOEC mode.

Details

Language :
English
Database :
OpenAIRE
Accession number :
edsair.doi.dedup.....c4cb1db00586f67a6616659865ad93e6