The Role of Interlayer on the Catalytic Activity and Performance Stability of (Pr_1-x Nd_x )₂ NiO₄ as Cathodes for Solid Oxide Fuel Cells

Journal Article · Tue May 30 00:00:00 EDT 2017 · ECS Transactions (Online)

DOI:https://doi.org/10.1149/07801.0983ecst· OSTI ID:1440635

Dogdibegovic, Emir; Alabri, Nawf Saif; Tenny, Kevin; Wright, Christopher J.; Hardy, John S.; Coyle, Christopher A.; Horlick, Sam; Guan, Wanbing; Stevenson, Jeffry W.; Zhou, Xiao-Dong

The use of doped ceria as an interlayer in solid oxide fuel cells (SOFCs) is ubiquitous, which provides a better thermal expansion match and prevents the interaction between cathode (e.g. LSCF) and electrolyte (e.g. YSZ). However, the role of ceria interlayer on the cathode phase durability, catalytic activity, and performance stability remains obscure. This is particularly true in nickelate cathodes (e.g. Pr2NiO4). In this work, the attention will be given to electrochemical properties in nickelate athodes with various interlayers. Two new interlayer designs were investigated including (1) a thin Pr6O11 film deposited on the surface of GDC and (2) a Pr-doped ceria interlayer. The latter design results in a 48% increase in cathode performance; and more importantly, it leads to zero degradation over long-term easurements. This is a tremendous improvement when compared to the performance degradation in cells with a GDC interlayer. The cathode-interlayer reaction was fully suppressed with PGCO, due to the intrinsic Pr enrichment in the interlayer, which contributed to suppressing the phase evolution in the electrode.

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1440635
• Report Number(s): PNNL-SA-128995; AA6040000
• Journal Information: ECS Transactions (Online), Vol. 78, Issue 1; ISSN 1938-6737
• Publisher: Electrochemical Society
• Country of Publication: United States
• Language: English