Stability and Activity of (Pr1-xNdx)2NiO4 as Cathodes for Solid Oxide Fuel Cells: I. Quantification of Phase Evolution in Pr2NiO4

详细信息    查看全文

• 作者：Emir Dogdibegovic ; Christopher J. Wright and Xiao-Dong Zhou
• 刊名：Journal of the American Ceramic Society
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：99
• 期：8
• 页码：2737-2741
• 全文大小：1299K
• ISSN：1551-2916

文摘

Praseodymium nickelate (Pr₂NiO₄) is an active oxygen electrode for solid oxide fuel cells, but undergoes phase transition at elevated temperatures (e.g., 750°C). Quantification of this phase evolution in an operating single cell is challenging because of the overlap of X-ray diffraction (XRD) peaks between the cathode and oxide current collector. In this work, we replace the oxide current collector with a gold metal grid, circumventing these challenges by allowing the exposure of the cathode to the X-ray beam, while eliminating peak overlap. Quantification of the phase evolution was performed by a least-squares fitting of the linear combination of XRD standards against the experimental patterns. Energy-dispersive spectroscopy analysis on long-term operated cells showed the absence of reactions between the gold grids and the cathodes. Additionally, the grids exhibited excellent mechanical stability under operating conditions and enabled similar cell performance as an oxide current collector.