The
development of a Co-free and Ni-free electrocatalyst for carbon
dioxide electrolysis would be a turning point for the large-scale
commercialization of solid-oxide electrolysis cells (CO2–SOECs). Indeed, the demand for cobalt and nickel is expected
to become critical by 2050 due to automotive electrification. Currently,
the reference materials for CO2–SOEC electrodes
are perovskite oxides containing Mn or Co (anodes) and Ni-YSZ cermets
(cathodes). However, issues need to be addressed, such as structural
degradation and/or carbon deposition at the cathode side, especially
at high overpotentials. This work designs the 20 mol % replacement
of iron by copper in La0.6Sr0.4FeO3−δ as a multipurpose electrode for CO2–SOECs. La0.6Sr0.4Fe0.8Cu0.2O3−δ (LSFCu) is synthesized by the solution combustion method, and iron
partial substitution with copper is evaluated by X-ray powder diffraction
with Rietveld refinement, X-ray photoelectron spectroscopy, thermogravimetric
analyses, and electrical conductivity assessment. LSFCu is tested
as the SOEC anode by measuring the area-specific resistance versus
T and pO2. LSFCu structural, electrical, and electrocatalytic
properties are also assessed in pure CO2 for the cathodic
application. Finally, the proof of concept of a symmetric LSFCu-based
CO2–SOEC is tested at 850 °C, revealing a current
density value at 1.5 V of 1.22 A/cm2, which is remarkable
when compared to similar Ni- or Co-containing systems.