Anode performance of Mn-doped ceria-ScSZ for solid oxide fuel cell

The 70 wt.% Mn-doped CeO2 (MDC)-30 wt.% Scandia-stabilized zirconia (ScSZ) composites are evaluated as anode materials for solid oxide fuel cells (SOFCs) in terms of chemical compatibility, thermal expansion coefficient, electrical conductivity, and fuel cell performance in H-2 and CH4. The conductivity of MDC10 (10 mol.% Mn-doping), MDC20, and CeO2 are 4.12, 2.70, and 1.94 S cm(-1) in H-2 at 900 A degrees C. With 10 mol.% Mn-doping, the fuel cells performances improve from 166 to 318 mW cm(-2) in H-2 at 900 A degrees C. The cell with MDC10-ScSZ anode exhibits a better performance than the one with MDC20-ScSZ in CH4, the maximum power density increases from 179 to 262 mW cm(-2). Electrochemical impedance spectra indicate that the Mn doping into CeO2 can reduce the ohmic and polarization resistance, thus leading to a higher performance. The results demonstrate the potential ability of MDC10-ScSZ composite to be used as SOFCs anode.