NiO 전구체가 고체산화물 연료전지 Ni/YSZ 음극의 미세구조와 전기전도도에 미치는 영향

Abstract

NiO/YSZ(70 wt%NiO) composite powders were prepared by ball-milling of 8YSZ and NiO precursors, dried and then followed by calcination. The approach was to combine acidic Ni(NO3)2 ·6H2O and basic 2NiCO3 ·3Ni(OH)2 ·4H2O via acid-base reaction as a mixed NiO precursor. Their effects were studied in the aspects of DSC, microstructure, porosity, and electrical conductivity. Ni/YSZ composite of 1N9C (1 mole NiO from the nitrate and 9 moles of NiO from the carbonate) was prepared by consolidation at 1400C for 3 h, and then followed by reduction at 1000C for 3 h under flowing of 6% H2/N2. It showed a homogeneous microstructure with ~20% porosity and 1880 S/cm at 1000C.