【摘 要】
：
The chemical and electrochemical stability of lanthanide nickelates La2NiO4+δ (LNO), Pr2NiO4+δ (PNO) and their mixed compounds La2-xPrxNiO4+δ (LPNOs) with x= 0.5, 1 or 1.5 is reported. The aim is to promote these materials as efficient electrodes for soli
【机 构】
：
CNRS,Univ.Bordeaux,Bordeaux INP,ICMCB,UMR 5026,F-33600 Pessac,France;Centre de Microcaractérisation
论文部分内容阅读
The chemical and electrochemical stability of lanthanide nickelates La2NiO4+δ (LNO), Pr2NiO4+δ (PNO) and their mixed compounds La2-xPrxNiO4+δ (LPNOs) with x= 0.5, 1 or 1.5 is reported. The aim is to promote these materials as efficient electrodes for solid oxide fuel cell (SOFC) and/or solid oxide electrolysis cell (SOEC). La2NiO4+δ and La1.5Pr0.5NiO4+δ compounds are chemically very stable as powders over one month in the temperature range 600- 800 ℃, while the other materials rich in praseodymium progressively de-compose into various perovskite-deriving components with additional Pr6O11. Despite their uneven prop-erties, all these materials are quite efficient and sustainable as electrodes on top of gadolinium doped ceria (GDCBL) // yttrium doped zirconia (8YSZ) electrolyte, for one month at 700 ℃ without polarization. Under polarization (300 mA·cm- 2), the electrochemical performances of LNO, PNO and La1.5Pr0.5NiO4+δ(LP5NO) quickly degrade in SOFC mode, i.e. for the oxygen reduction reaction, while they show durability in SOEC mode, i.e. for the oxide oxidation reaction.
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