Superior Performance as Cathode Material for Intermediate-Temperature Solid Oxide Fuel Cells of the Ruddlesden-Popper n = 2 Member Eu2SrCo0.50Fe1.50O7-δ with Low Cobalt Content.
Daniel Muñoz GilKhalid BoulahyaMaría Santamaria SantoyoMaría Teresa AzcondoUlises AmadorPublished in: Inorganic chemistry (2021)
The effects of the contents of iron and cobalt on the crystal structure, oxygen content, thermal expansion coefficient, and electrical-electrochemical properties of materials Eu2SrCoxFe2-xO7-δ (x = 0.50 and 1.00) are reported. These oxides are well-ordered new members of the Ruddlesden-Popper series (Eu,Sr)n+1(Co,Fe)nO3n+1 system with n = 2 as determined by selected area electron diffraction and high-resolution transmission electron microscopy and X-ray diffraction studies. The two materials are semiconductors of p-type, with much higher total conductivity under working conditions for the low cobalt compound, Eu2SrCo0.50Fe1.50O7-δ. Composite cathodes prepared with this oxide present much lower area-specific resistance values (0.08 Ω·cm2 at 973 K in air) than composites containing Eu2SrCo1.00Fe1.00O7-δ (1.15 Ω·cm2). This significant difference is related to the much higher total conductivity and a sufficiently high content of oxygen vacancies in the Fe-rich phase. The excellent electrochemical performance of Eu2SrCo0.50Fe1.50O7-δ with low cobalt content, which shows one of the lowest area-specific resistance reported so far for a Ruddlesden-Popper oxide, makes it a good candidate for application as a cathode material for solid oxide fuel cells at intermediate temperatures in real devices.
Keyphrases
- reduced graphene oxide
- electron microscopy
- crystal structure
- gold nanoparticles
- high resolution
- induced apoptosis
- metal organic framework
- cell cycle arrest
- ion batteries
- computed tomography
- magnetic resonance
- solar cells
- magnetic resonance imaging
- cell proliferation
- label free
- cell death
- case control
- dual energy
- tandem mass spectrometry
- oxide nanoparticles