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

Abstract

We report a new nickel‐iron alloy nanoparticle‐decorated LaSrFe0.75Ni0.25O4 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 LaSrFeNiO6‐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.

Rational Design of Metal Oxide–Based Cathodes for Efficient Dye‐Sensitized Solar Cells

“…Furthermore, a phenomenon called exsolution or precipitation of NPs has been recently observed at the surface of perovskite oxides. [208][209][210][211] Interestingly, the NPs are particularly active for electrocatalytic reactions at room temperature such as ORR, OER and hydrogen evolution reaction (HER). [210,211] The application of exsolution phenomenon in perovskitebased CEs for DSSCs should be an attractive future research direction.…”

Recent Advances in Novel Nanostructuring Methods of Perovskite Electrocatalysts for Energy‐Related Applications

“…With the advancing of exsolution strategies, many other exsolved products, aside from B‐site single metal nanoparticles, have been generated. These include single metals (e.g., Ag) and lanthanide oxides (e.g., PrO x ) exsolved from the A site, metal alloys (e.g., FeNi 3 and Pt 3 Ni), transition metal oxides (e.g., MnO), metal/metal oxide hybrids (e.g., Co/CoO x ) exsolved from the B site, and metal oxides/metal composites (e.g., BaO and Ni) exsolved from both the A and B sites. The parent perovskite oxides used for exsolution can be synthesized not only by conventional methods such as solid‐state reaction or sol–gel process, but also by newly developed approaches like electrospinning and template‐assisted synthesis .…”

“…Exsolution : Besides infiltration, exsolution is also extensively used to develop nanoparticle‐decorated perovskite anodes. It is interesting that nanoparticles can lead to the enhancement in catalytic activity because of the high chemical reactivity conferred to the parent perovskite materials . For instance, Ni nanoparticles were exsolved from La 0.8 Sr 0.2 Cr 0.69 Ni 0.31 O 3− δ after a reducing treatment in H 2 , which extended the length of triple phase boundaries (TPB) and thus contributed to the improvement in the SOFC performance .…”

Ruddlesden–Popper Oxide (La0.6Sr0.4)2(Co,Fe)O4 with Exsolved CoFe Nanoparticles for a Solid Oxide Fuel Cell Anode Catalyst

“…[25,26] To obtain this structure at low temperatures, a recently proposed method is to reduce the perovskite derivatives at temperatures near 800 C, resulting in the formation of the Ruddlesden-Popper structure along with in situ grown metallic-phase nanoparticles. [15,17,[27][28][29][30] This strategy ensures that particle growth of the Ruddlesden-Popper support, which leads to a decrease in reaction sites, is suppressed due to the relatively low preparation temperature. It has been previously reported that the Ruddlesden-Popper material of La gas mixture at 800 C, whose condition is much milder than the typical synthesis method of Ruddlesden-Popper materials.…”