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Title: Activity and Stability of (Pr 1-xNd x) 2NiO 4+δ as Cathodes for Oxide Fuel Cells: Part VI. The Role of Cu Dopant on the Structure and Electrochemical Properties

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. Pr 2NiO 4+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 (Pr 0.50Nd 0.50) 2Ni 1-yCu yO 4+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 Pr 2NiO 4+δ, make newly developed electrodes attractive candidates for the state-of-the-art solid oxide fuel cell applications.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [4] ;  [4] ;  [4] ;  [1]
  1. Univ. of South Carolina, Columbia, SC (United States). Dept. of Chemical Engineering
  2. Univ. of South Carolina, Columbia, SC (United States). Dept. of Chemical Engineering; Chinese Academy of Sciences (CAS), Dalian (China). Division of Fuel Cells. Dalian National Lab. for Clean Energy. Dalian Inst. of Chemical Physics
  3. North Carolina State Univ., Raleigh, NC (United States). Dept. of Nuclear Engineering
  4. LG Fuel Cell Systems Inc., North Canton, OH (United States)
Publication Date:
Grant/Contract Number:
FE0023475; FE0012077
Type:
Accepted Manuscript
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 164; Journal Issue: 10; Journal ID: ISSN 0013-4651
Publisher:
The Electrochemical Society
Research Org:
Univ. of South Carolina, Columbia, SC (United States); LG Fuel Cell Systems Inc., North Canton, OH (United States)
Sponsoring Org:
USDOE Office of Fossil Energy (FE)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE; activity; cathode; nickelate; phase transition; stability
OSTI Identifier:
1427992