Electrochemical characteristics of La0.8Sr0.2Cr0.82Ru0.18O3−δ–Gd0.1Ce0.9O2 solid oxide fuel cell anodes in H2–H2O–CO–CO2 fuel mixtures

This paper describes the performance of composite La0.8Sr0.2Cr0.82Ru0.18O3−δ–Gd0.1Ce0.9O2 anodes operated in varied H2O–H2, CO–CO2, and H2O–H2–CO–CO2 fuel mixtures. Impedance spectroscopy studies in both H2O–H2 and CO–CO2 showed two main impedance responses that were thermally activated and exhibited power law variation with gas partial pressures. The polarization resistances in CO–CO2 mixtures were larger than in H2–H2O mixtures with the same partial pressure ratios. Polarization resistances for surrogate coal syngas H2O–H2–CO–CO2 fuel mixtures were higher than for H2O–H2–Ar mixtures with the same H2 and H2O partial pressures, indicating that CO or CO2 interfered with the H2 oxidation reaction.

► The performance of La0.8Sr0.2Cr0.82Ru0.18O3−δ–Gd0.1Ce0.9O2 anode was studied in various H2- and CO-containing fuels.
► The data suggest that CO and/or CO2 interfere with the H2 oxidation reaction.
► The primary anode impedance responses were thermally activated and exhibited power law variation with gas partial pressures.