Activity and Stability of (Pr1-xNdx)2NiO4+δ as Cathodes for Oxide Fuel Cells: Part VI. The Role of Cu Dopant on the Structure and Electrochemical Properties. Issue 10 (12th August 2017)

• Record Type: Journal Article
• Authors: Dogdibegovic, Emir; Yan, Jingbo; Cai, Qinsheng; Jung, Hwa Young; Xing, Zhengliang; Liu, Zhien; Goettler, Richard W.; Zhou, Xiao-Dong
• Is Part Of: Journal of the Electrochemical Society. Volume 164:Issue 10(2017)
• Page Start: F3131
• Page End: F3139
• Publication Date: 2017-08-12
• Subjects: activity -- cathode -- nickelate -- phase transition -- stability; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.0021710jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : Phase instability in praseodymium nickelates is a major concern for the long-term operations of solid oxide fuel cells since it may lead to the performance degradation. In this work, praseodymium nickelates (ex. Pr2 NiO4+δ ) have been stabilized via substitution on both Pr- and Ni-sites. Systematic studies over a wide range of compositions were conducted via long-term thermal annealing studies (T ≤ 870°C) and electrochemical tests in full cells. Proposed (Pr0.50 Nd0.50 )2 Ni1-y Cuy O4+δ compositions ( y = 0.05, 0.10, 0.20, and 0.30) showed the most promising results and serve as a comprehensive extension to our previous studies in this series of papers. A stable long-term performance was obtained for temperatures up to 790°C for 500 hours at 0.80 V with a minimal tradeoff between the activity (power density of 0.8–1.0 W cm −2 at 850°C) and performance stability. A preserved parent phase and suppressed performance degradation, when compared to Pr2 NiO4+δ, make newly developed electrodes attractive candidates for the state-of-the-art solid oxide fuel cell applications.