Investigation on thermal, electrical, and electrochemical properties of scandium-doped Pr0.6Sr0.4(Co0.2Fe0.8)(1−x)ScxO3−δ as cathode for IT-SOFC

Scandium Doping Effect on a Layered Perovskite Cathode for Low-Temperature Solid Oxide Fuel Cells (LT-SOFCs)

“…The activation energies (E a ) are 102 and 96 kJ mol −1 for PBCO and PBCSc, respectively. This result matches well with other reports on the enhancement of oxygen surface exchange through partial substitution of Sc 3+ [31,32]. Figure 6 presents the current-voltage (I-V) curves and corresponding power density curves for the cathode/GDC/Ni-GDC cell using humidified H 2 and air, as a fuel and oxidant, respectively.…”

“…For example, substituting constant-valence state metal ions (e.g., Nb 5+ , Ta 5+ , and Ti 4+ ) into the perovskite could increase the ionic conductivity by reducing the lattice strain that occurs during the oxygen ion transport [27][28][29][30]. Especially, in the oxygen transport membrane system, it was reported that doping scandium into the perovskite-type oxide improves the electrochemical property by lowering the activation energy for oxygen ion transfer [31,32]. In this regard, the Sc 3+ doped layered perovskite oxide is expected to exhibit a lower cathode polarization of the LT-SOFC.…”

Characterization of B‐Site Niobium‐Doped Pr0.4Sr0.6 (Co0.3Fe0.6)1‐xNbxO3‐δ (x=0, 0.05, 0.1, 0.2) Perovskites as Cathode Materials for Solid Oxide Fuel Cells

“…Meanwhile, other metals coexisted in Fe−Co based perovskite oxides result in the further improvement of the catalytic activity and stability. For example, transition metal doped Fe−Co based perovskite oxides such as Ln 1‐x Sr x Co 1‐y Fe y O 3‐δ (LnSCF, Ln=La, Pr, Sm, and Gd) were found to have high electronic‐ionic mixed conductivity and high activity for the cathodic reaction in SOFC . Zhang et al .…”

“…In general, the active oxygen locating on the surface (the outermost few monolayers,∼2‐3 nm) and the lattice oxygen locating in the bulk (the following ∼4‐8 nm) are possible to be distinguished by XPS as the former one has the higher binding energy. Therefore, the lower binding energy for the O1s peaks at 528.2 eV and 528.4 eV for PSCF and PSCFN 0.1 respectively in Figure (a) were attributed to the lattice oxygen of the perovskite structure ,,. The small shift from 528.2 eV to 528.4 eV should be resulted from environmental difference of the O atoms.…”

A Highly Active Perovskite Cathode for Low‐Temperature Solid Oxide Fuel Cells: BaCo0.7Fe0.22Sc0.08O3–δ

“…Recently, it was claimed that Sc‐doping at the B site of SrCoO 3 oxides stabilized the cubic structure, even at low temperatures . Additionally, introduction of Sc 3+ at the B site of the cobalt‐based perovskite oxides may improve the catalytic and oxygen ion diffusion properties because of its stable +3 valences, large ionic radius, and high polarizability …”