Artículo de revista
Mo,Cu-doped CeO2 as anode material of solid oxide fuel cells (SOFCs) using syngas as fuel
Fecha
2021Registro en:
J. Electrochem. Sci. Technol., 2021, 12(2), 246-256
10.33961/jecst.2020.01571
Autor
Díaz Aburto, Isaac
Hidalgo, Jacqueline
Fuentes Mendoza, Eliana
González Poggini, Sergio
Estay, Humberto
Colet Lagrille, Melanie
Institución
Resumen
Mo,Cu-doped CeO2 (CMCuO) nanopowders were synthesized by the nitrate-fuel combustion method aiming to improve
the electrical and electrochemical properties of its Mo-doped CeO2 (CMO) parent by the addition of copper. An electrical
conductivity of ca. 1.22·10-2 S cm-1 was measured in air at 800oC for CMCuO, which is nearly 10 times higher than that
reported for CMO. This increase was associated with the inclusion of copper into the crystal lattice of ceria and the presence
of Cu and Cu2O as secondary phases in the CMCuO structure, which also could explain the increase in the charge transfer
activities of the CMCuO based anode for the hydrogen and carbon monoxide electro-oxidation processes compared to the
CMO based anode. A maximum power density of ca. 120 mW cm-2 was measured using a CMCuO based anode in a solid
oxide fuel cell (SOFC) with YSZ electrolyte and LSM-YSZ cathode operating at 800°C with humidified syngas as fuel,
which is comparable to the power output reported for other SOFCs with anodes containing copper. An increase in the area
specific resistance of the SOFC was observed after ca. 10 hours of operation under cycling open circuit voltage and polarization
conditions, which was attributed to the anode delamination caused by the reduction of the Cu2O secondary phase
contained in its microstructure. Therefore, the addition of a more electroactive phase for hydrogen oxidation is suggested
to confer long-term stability to the CMCuO based anode.