Perovskites in Solid Oxide Fuel Cells

Abstract

Perovskite oxides comprise large families among the structures of oxide compounds, and several perovskite-related structures are also known. Because of their diversity in chemical composition, properties and high chemical stability, perovskite oxides are widely used for preparing solid oxide fuel cell (SOFC) components. In this work a few examples of perovskite cathode and anode materials and their necessary modifications were shortly reviewed. In particular, nickel-substituted lanthanum ferrite and iron-substituted strontium titanate as cathode materials as well as niobium-doped strontium titanate, as anode material, are described. Electrodes based on the modified perovskite oxides are very promising SOFC components.

Cr-poisoning of a LaNi0.6Fe0.4O3 cathode under current load

“…The electrochemical reaction mechanism for the reduction of oxygen by the LNF cathode is probably restricted mainly to the TPB region (similarly to LSM), as suggested by the (minor) deposition of Pt at the interfaces and a very low bulk ionic conductivity of LNF [1,36,37]. 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 [38,39]).…”

Enthalpy of formation and thermodynamic insights into yttrium doped BaZrO3

“…28 YBZ has a perovskite structure, ABO 3 , which is ideally cubic where the A-site is usually occupied by a divalent cation (A ¼ Ba, Pb, Ca) and the B-site by a tetravalent cation (B ¼ Zr, Ce, Ti), with coordination numbers of 12 and 6, respectively. 29,30 As described, the structure does not include protons, and for their incorporation the perovskite host matrix has to be doped by a trivalent cation on the B-site which will create oxygen vacancies ðV $$ o Þ as charge compensating defects. Upon exposure to humid atmosphere, water molecule will dissociate into a hydroxyl group and a proton, which will ll an oxygen vacancy and bond to a lattice oxygen ðO Â o Þ, respectively.…”

Synthesis of Hyperbranched Perovskite Nanostructures

“…Metal-oxide materials can display unique electronic, structural, and optical properties when scaled down to nanometer dimensions. , Perovskite materials in particular show a diverse and rich variety of functionalities and properties and find utility in many applications such as ferroelectrics and piezoelectrics, , superconductors, , dielectrics, heterogeneous catalysis, photocatalysis, − and fuel cells , and batteries. − In many of these applications, nanostructured perovskite materials such as nanocrystals and nanowires have shown improved properties and revealed new phenomena compared with bulk morphologies. − …”