La2Sn2O7 nano-powder is synthesized by co-precipitation method. La0.6Sr0.4Co0.2Fe 0.8O3-δ (LSCF) and Gd0.1Ce 0.9O1.95 (GDC) composite fibers are fabricated by electrospinning. Scanning electron microscopy (SEM) images show highly increased triple phase boundary (TPB) sites and pores in the electrospun cathode. The interfacial resistance of the electrospun cathode is reduced by 0.2 Ω cm2 compared to the conventional cathode at 650°C. When dry methane fuel is fed to the anode, the reduction rate of the power density of the La2Sn2O7-Ni-GDC anode-supported cell significantly decreases compared to that of the Ni-GDC anode-supported cell at 650°C. The anode resistance in the low frequency range (∼3 Hz) associated with methane conversion shows a remarkable difference between the La2Sn2O7-Ni-GDC and Ni-GDC anode. Temperature-programmed reduction (TPR) analysis reveals the La 2Sn2O7 catalyst is effective for the methane oxidation reaction at 650°C. The Fuel cell in this study manifests a maximum power density of 1.02 W cm-2 and 0.94 W cm-2 at 650°C in hydrogen and dry methane atmosphere, respectively. Also, no carbon deposition existed on the La2Sn2O7-Ni-GDC anode after operating.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)