Electrochemical ageing study of mixed lanthanum/praseodymium nickelates La2-xPrxNiO4+δ as oxygen electrodes for solid oxide fuel or electrolysis cells

• 作者: Vaibhav Vibhu Aurélien Flura Aline Rougier Clément Nicollet Sébastien Fourcade Teresa Hungria Jean-Claude Grenier Jean-Marc Bassat
• 来源期刊: 能源化学
• 年，卷（期）: 2020,（7）
• 页码范围: 62-70
• 页数: 9页
• 语种: 英文

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 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.