Thermal stability, oxygen non-stoichiometry and transport properties of LaNi0.6Fe0.4O3

Advances in Cathode Materials for Solid Oxide Fuel Cells: Complex Oxides without Alkaline Earth Metal Elements

“…[221][222][223][224] For instance, it was reported that the oxygen nonstoichiometry in a LaNi 0.3 Fe 0.7 O 3-δ material did not exceed 0.025 at 1100 °C under oxygen partial pressure as low as 10 −3 atm. [ 224 ] Bevilacqua et al performed X-ray absorption near edge spectroscopy and extended X-ray absorption fi ne structure analyses on LNF64 material. The results demonstrated that both Fe x + and Ni x + were trivalent and their coordination number is around six, suggesting almost no oxygen vacancy in the structure at room temperature.…”

Sintering temperature dependence of conductivity, porosity and specific surface area of LaNi0.6Fe0.4O3 ceramics as cathode material for solid oxide fuel cells—Superiority of Pechini method among various solution mixing processes

“…So far, various solution mixing methods such as Pechini method [4], glycine-nitrate process (GN process), a gel-citrate complexation route (GC complexation), a coprecipitation route (CP route) [3], and combustion synthesis routes using citric-gel (CG combustion) or urea (urea combustion) [5] have been proposed as preparation methods of LaNi 0. 6 The sintering temperature dependence of the porosity, specific surface area and electrical conductivity of LaNi 0.6 Fe 0.4 O 3 , which is one of the candidate materials for solid oxide fuel cells (SOFC) cathodes, prepared by Pechini method has been investigated. From a comparison of the sintering property, specific surface area and electrical conductivity with those of specimens prepared by other preparation methods, it has been revealed that the Pechini method and co-precipitation (CP) route are the most suitable methods for the preparation of LaNi 0.6 Fe 0.4 O 3 ceramic for SOFC cathode.…”

“…In this study, the sintering temperature dependence of the porosity, specific surface area and the electrical conductivity of LaNi 0.6 Fe 0.4 O 3 ceramics prepared by the Pechini method have been investigated for their application as cathode materials for SOFCs. In addition, the above properties observed in this study are compared with those reported for specimens prepared by the other solution mixing methods [3,5,6] in order to obtain information which method is the most suitable for production of LaNi 0.6 Fe 0.4 O 3 powder as raw material for SOFC cathode.…”

Cr-tolerance of the IT-SOFC La(Ni,Fe)03 material

“…The applied frequencies ranged from 100 kHz to 0.1 Hz with a signal amplitude of 10 mV. The specific electronic conductivity in S/cm was calculated from the sheet resistance of the porous LNF layer and the LNF layer thickness, as determined by SEM, assuming a negligible ionic contribution [32,48]. The high frequency intercept in the Nyquist plot (ZView2) was taken as the electronic resistance.…”

“…This is suggested by the (minor) deposition of Pt at the interfaces and a very low bulk ionic conductivity of LNF [32,83,84]. Therefore, the oxygen reduction reaction (ORR) is localized and restricted to the TPB, unlike for the LSCF cathode (which is a MIEC cathode, hence its comparatively high bulk ionic conductivity broadens the ORR region [85,86]).…”