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Title: Progress in durability of metal-supported solid oxide fuel cells with infiltrated electrodes

Journal Article · · Journal of Power Sources
 [1]; ORCiD logo [1];  [1];  [2]; ORCiD logo [2]; ORCiD logo [1]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Energy Storage and Distributed Resources Div.
  2. Univ. of California, Merced, CA (United States). Dept. of Mechanical Engineering
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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 °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.

Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Advanced Research Projects Agency - Energy (ARPA-E); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231; 13/CJ000/04/03
OSTI ID:
1559252
Alternate ID(s):
OSTI ID: 1572094; OSTI ID: 1693524
Journal Information:
Journal of Power Sources, Vol. 437, Issue C; ISSN 0378-7753
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 32 works
Citation information provided by
Web of Science

Figures / Tables (9)

Table 1(p. 11)table Table 1
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Figure 2(p. 15)figure Figure 2
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Figure 4(p. 20)figure Figure 4
Figure 5(p. 24)figure Figure 5
Figure 6(p. 26)figure Figure 6
Figure 7(p. 30)figure Figure 7

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Related Subjects

25 ENERGY STORAGE
Solid oxide fuel cell
Metal-support
Degradation
Chromium poisoning
ALD coating
Preoxidation