Solid oxide fuel cell anodes prepared by infiltration of strontium doped lanthanum vanadate into doped ceria electrolyte

Abstract

Aqueous infiltration methods were used to produce a ceramic composite of 20-vol% La0.7Sr0.3VO3−δ (LSV), 2.1-vol% CeO2, and 0.3-vol% Pd in a porous Ce0.85Sm0.15O2−δ (SDC) scaffold for potential application as Ni-free low-temperature solid-oxide-fuel-cell (SOFC) anodes. At 873K, cells with mentioned anode composition and La0.8Sr0.2CoO3−δ (LSC) cathodes demonstrated total electrode polarization resistances of 0.3Ωcm2 and 0.6Ωcm2 in humidified (3% H2O) H2 and CH4, respectively. Improved anode performance was also achieved by modifying the surface of the porous SDC scaffold through etching with an aqueous HF solution, decreasing the total cell polarization resistances to 0.1Ωcm2 and 0.4Ωcm2 at 873K in humidified H2 and CH4, respectively. The anodes based on LSV-SDC composites exhibited stable performance for at least 40h under load.