Nickel-Iron Alloy Nanoparticle-Decorated K₂NiF₄-Type Oxide as an Efficient and Sulfur-Tolerant Anode for Solid Oxide Fuel Cells

We report a new nickel-iron alloy nanoparticle-decorated LaSrFe_0.75Ni_0.25O₄ K₂NiF₄-type oxide with Ruddlesden-Popper structure (RP-LSFN), which performed as a high-performance sulfur-resistant anode prepared by using an infiltration method for solid oxide fuel cells (SOFCs) with LaSrFeNiO_6-δ double perovskite (DP-LSFN) as the precursor. A reduction converts the DP-LSFN phase into mixed phases containing the RP-LSFN and FeNi₃ nanoparticles. The morphology, thermal expansion behavior, sulfur tolerance, and electrochemical activity for hydrogen oxidation of this FeNi₃ nanoparticle-decorated, RP-LSFN-infiltrated anode are investigated. An electrolyte-supported SOFC with this infiltrated anode generates a high power output of 541 mW cm⁻² at 800 °C operated with 1000 ppm H₂S−H₂ as the fuel, which compares favorably to that with pure H₂ fuel. A single cell with this anode demonstrates favorable stability at 800 °C during 90, 40, and 20 h operation with H₂ containing 100, 200, and 1000 ppm H₂S, respectively.