Nickel‐Iron Alloy Nanoparticle‐Decorated K 2 NiF 4 ‐Type Oxide as an Efficient and Sulfur‐Tolerant Anode for Solid Oxide Fuel Cells

We report a new nickel‐iron alloy nanoparticle‐decorated LaSrFe 0.75 Ni 0.25 O 4 K 2 NiF 4 ‐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 FeNi 3 nanoparticles. The morphology, thermal expansion behavior, sulfur tolerance, and electrochemical activity for hydrogen oxidation of this FeNi 3 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 H 2 S−H 2 as the fuel, which compares favorably to that with pure H 2 fuel. A single cell with this anode demonstrates favorable stability at 800 °C during 90, 40, and 20 h operation with H 2 containing 100, 200, and 1000 ppm H 2 S, respectively.