Layered oxygen-deficient double perovskite as an efficient and stable anode for direct hydrocarbon solid oxide fuel cells

Abstract

Different layered perovskite-related oxides are known to exhibit important electronic, magnetic and electrochemical properties. Owing to their excellent mixed-ionic and electronic conductivity and fast oxygen kinetics, cation layered double perovskite oxides such as PrBaCo2O5 in particular have exhibited excellent properties as solid oxide fuel cell oxygen electrodes. Here, we show for the first time that related layered materials can be used as high-performance fuel electrodes. Good redox stability with tolerance to coking and sulphur contamination from hydrocarbon fuels is demonstrated for the layered perovskite anode PrBaMn2O5+δ (PBMO). The PBMO anode is fabricated by in situ annealing of Pr0.5Ba0.5MnO3-δ in fuel conditions and actual fuel cell operation is demonstrated. At 800 °C, layered PBMO shows high electrical conductivity of 8.16 S cm(-1) in 5% H2 and demonstrates peak power densities of 1.7 and 1.3 W cm(-2) at 850 °C using humidified hydrogen and propane fuels, respectively.

Enhanced ionic conductivity in magnetron-sputtered Ce0.8Sm0.2O2-δ/Al2O3 multilayers

“…Solid electrolytes with high oxide-ion conductivities have been widely used in a range of electrochemical devices, including solid oxide electrolysis cells (SOECs), solid oxide fuel cells (SOFCs) and oxygen sensors [1][2][3][4]. The traditional solid electrolyte, e.g.…”

Rational Design of a Water‐Storable Hierarchical Architecture Decorated with Amorphous Barium Oxide and Nickel Nanoparticles as a Solid Oxide Fuel Cell Anode with Excellent Sulfur Tolerance

“…Over the past decade, much research has been focused on developing new materials and architectures, such as Ni alloys with sulfur‐tolerant elements, oxide electrodes, anode functional layers, unique anode architectures, and nanocatalyst‐modified anode surfaces,10, 11, 12, 13, 14 for improving the sulfur tolerance of SOFC anodes. However, none of the tested systems meets all the strict requirements for practical SOFC anodes, such as good compatibility with other cell components, high conductivity, high fuel electro‐oxidation/reforming activities and excellent coking/sulfur resistance.…”

Evaluation of Ba deficient NdBaCo2O5+δ oxide as cathode material for IT-SOFC

“…conferring anodic properties for use in symmetric SOFCs [12]. A' site understoichiometry was first investigated: Ba deficiency (x = 0 ÷ 0.08) in PrBa1-xCo2O5+δ caused a shrinkage of the crystal cell size, slightly affected the thermal expansion coefficient, and affected both the electrical conductivity and the electrochemical activity [13][14][15].…”