Journal
JOURNAL OF POWER SOURCES
Volume 437, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2019.226935
Keywords
Solid oxide fuel cell; Metal-support; Infiltration; Chromium poisoning
Funding
- Advanced Research Projects Agency - Energy, U.S. Department of Energy [13/CJ000/04/03]
- U.S. Department of Energy [DE-AC02-05CH11231]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
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High power density and longevity are required to commercialize solid oxide fuel cells for vehicular applications. In this work, electrochemical durability of high-performance metal-supported solid oxide fuel cells (MS-SOFCs) with infiltrated catalysts is investigated. Durability screening of various cathode and anode compositions is conducted. The Pr6O11 cathode and SDCN40 (40 vol% Ni-60 vol% SDC) anode are selected due to preferential tradeoff between performance and durability. X-ray diffraction indicates the catalyst phases are stable after prolonged thermal annealing. Electrochemical impedance and scanning electron microscopy analyses show that the evolution of SDCN40 is minimal, and coarsening and Cr poisoning of the Pr6O11 catalyst are the dominant degradation mechanisms. These degradation mechanisms are addressed by implementing three additional fabrication steps: (1) preoxidation of the metal support, (2) deposition of thin and protective atomic layer deposition (ALD) coatings throughout the cathode-side electrode and support, and (3) in situ pre-coarsening of the catalysts. A favorable tradeoff is achieved: the combination of the three fabrication steps reduces degradation rate at 0.7 V and 700 degrees C by two orders of magnitude to 2.3% kh(-1), while sacrificing 35% of initial power density. The catalyst pre-coarsening step is primarily responsible for the loss of performance.
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