NiO-La0.75Sr0.25Cr0.5Mn0.5O3-δ-Ce0.8SM0.2O2-δ composite anode for natural gas in intermediate temperature solid oxide fuel cell

Anode-supported solid state fuel cells (SOFCs) based on composite anode NiO-La0.75Sr0.25Cr0.5Mn0.5O3-delta-Ce0.8Sm0.2O2-delta were fabricated by dry-pressing process. The composite cathode and electrolyte were consisted of La0.8Sr0.2Co0.8Fe0.2O3-delta(LSCF)-Ce0.8Gd0.2O2-delta(GDC) and Ce0.8Gd0.2O2-delta(GDC), respectively. The performance of single cell used humidified natural gas(3% H2O) as fuel and oxygen was tested as oxidant was tested from 400 T to 700 degrees C. The chemical stability, microstructures and carbon deposition have been investivaged using XRD, SEM, EDX. The results show that composite anode and composite cathode are with better pore microstructure, and the composite anode has good chemical compatibility. EDX measurements showed only a small carbon peaks. We have also tested the stability of the single cell at 600 degrees C for 13 h. The results show that the composite anode exhibits better stability and no degradation is observed in 13 h testing periods. The result of performance tests indicate that the maximum output current density and power density are 215.49 mA center dot cm(-2) and 44.85 mW center dot cm(-2) at 600 degrees C, respectively.