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Bismuth Doped Lanthanum Ferrite Perovskites as Novel Cathodes for Intermediate-Temperature Solid Oxide Fuel Cells
journal contribution
posted on 2014-07-23, 00:00 authored by Mei Li, Yao Wang, Yunlong Wang, Fanglin Chen, Changrong XiaBismuth is doped to lanthanum strontium
ferrite to produce ferrite-based
perovskites with a composition of La0.8‑xBixSr0.2FeO3‑δ (0 ≤ x ≤ 0.8) as novel cathode material
for intermediate-temperature solid oxide fuel cells. The perovskite
properties including oxygen nonstoichiometry coefficient (δ),
average valence of Fe, sinterability, thermal expansion coefficient,
electrical conductivity (σ), oxygen chemical surface exchange
coefficient (Kchem), and chemical diffusion
coefficient (Dchem) are explored as a
function of bismuth content. While σ decreases with x due to the reduced Fe4+ content, Dchem and Kchem increase since
the oxygen vacancy concentration is increased by Bi doping. Consequently,
the electrochemical performance is substantially improved and the
interfacial polarization resistance is reduced from 1.0 to 0.10 Ω
cm2 at 700 °C with Bi doping. The perovskite with x = 0.4 is suggested as the most promising composition as
solid oxide fuel cell cathode material since it has demonstrated high
electrical conductivity and low interfacial polarization resistance.
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Bismuth Doped Lanthanum Ferrite PerovskitesDchemBi dopingconductivitynovel cathode materialcontentoxide fuel cellsKchempolarization resistanceOxide Fuel CellsBismuthchemical diffusion coefficientperovskitelanthanum strontium ferriteoxide fuel cell cathode material0.10 Ω cm 2oxygen vacancy concentration
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