Perovskites Doped with Small Amounts of Noble Metals for IT-SOFCs

Abstract

Noble metal-doped lanthanum strontium ferrite (La0.6Sr0.4Fe0.99M0.01O3-d M=Ru, Pt) powders were developed as active electrodes for intermediate temperature solid oxide fuel cells (IT-SOFCs). The as low as 1% mol doping sensitively improved the electrochemical performance. Structural, electrical, and electrochemical properties are discussed in detail. Fuel cell tests in H2 show promising performance in the 700-750°C temperature range.

Enhancing Oxygen Reduction Activity and Structural Stability of La0.6Sr0.4FeO3−δ by 1 mol % Pt and Ru B-Site Doping for Application in All-Perovskite IT-SOFCs

“…The increase of the demand is leading to a continuous rise of Co cost, , while the price of platinum group metals (PGMs) is decreasing, thanks to recovery strategies from automotive catalysts (Pt, Pd, and Rh), electronic waste, and slag tailings. , Moreover, Ru is the least expensive among noble metals . Recently, noble metal-doped lanthanum ferrites have been proposed as a viable solution for IT-SOFC electrodes …”

Pt-Doped Lanthanum Ferrites as Versatile Electrode Material for Solid Oxide Cells

“…B-site doping (< 5%) with noble metals is an established strategy to supply the perovskite oxide surface with highly active nanoparticles, that segregate under reducing conditions in the so-called exsolution phenomenon (12)(13)(14). This structural evolution is entirely reversible upon re-oxidation, providing PGM-doped lanthanum ferrites with the ability to renew the catalytic sites at each reduction (15).…”