LSGM계 고체산화물 연료전지의 전해질-음극 사이의 계면안정성

Abstract

Interfacial reactions at LSGM electrolyte and NiO-GDC anode interfaces were thoroughly investigated with environmental Scanning Electron Microscopy (ESEM-PHILIPS XL-30) and Energy Dispersive X-ray (EDX-Link XL30). According to the analysis, serious reaction zone was observed at LSGM/NiO-GDC interface. It was found that the reaction layer was originated from the chemical reaction between NiO and LSGM. The reaction products were identified as La deficient form of LSGM based perovskite and Ni-La-O compounds such as LaSrGa3O7 and LaNiO3 from the X-ray diffraction (XRD, Philips) analysis. According to the electrical characterization, interfacial layer was very electrically resistive which would be the cause of high internal resistance and low power generating characteristic of the unit cell.