In situ Studies of Phase Evolution in (Pr1-xNdx)2NiO4 Electrodes with Various Interlayer Chemistries

Monday, 24 July 2017
Grand Ballroom East (The Diplomat Beach Resort)
E. Dogdibegovic, N. S. Alabri, C. J. Wright (University of South Carolina), J. S. Hardy, C. A. Coyle (Pacific Northwest National Laboratory), S. Horlick (University of South Carolina), W. Guan (Ningbo Institute of Materials Technology and Engineering), J. W. Stevenson (Pacific Northwest National Laboratory), and X. D. Zhou (University of South Carolina)
Nickelate (e.g. Pr2NiO4) exhibits high activity towards the oxygen reduction reaction over a wide temperature range (600 - 900 oC), which makes it a promising candidate as an advanced cathode for solid oxide fuel cells. However, a phase transition occurs in Pr2NiO4 during cell operation, following: Pr2NiO4 à Pr6O11 + Pr3Ni2O7. As a result, the quantification of the degree of phase transformation becomes necessary to understand the structure-electrochemical property relationship. In this presentation, we report our recent work on (1) replacing the oxide current collector with a gold metal grid, which enables the cathode to expose to the x-ray beam. The x-ray analysis was performed at room temperature and (2) utilizing in situ capability to study the kinetics and mechanisms of phase evolution and establishing the relationship between high-temperature structures and the electrochemical performance. Finally, we will compare the XRD results acquired from room temperature with these in situ studies.

This material is based upon work supported by the U.S. Department of Energy under Award Number DE-FE0023475.