期刊
CHEMISTRY OF MATERIALS
卷 25, 期 21, 页码 4224-4231出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm402879r
关键词
atomic layer deposition; solid oxide fuel cell; cathode; stability
资金
- U.S. Army Research Laboratory
- U.S. Army Research Office [W911NF-10-R-006, W911NF-13-1-0158, NSF-CBET1264706]
- Robert A. Welch Foundation of Houston, TX
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1264706] Funding Source: National Science Foundation
We report that the long-term stability of a conventional mixed oxide-ion and electron conducting solid oxide fuel cell cathode, La0.6Sr0.4Fe0.8Co0.2O3-delta-Gd0.2Ce0.8O1.9 (LSCF-GDC) composite, can be markedly improved by functionalizing its surfaces with a conformal layer of nanoscale ZrO2 films through atomic layer deposition (ALD). Over a >1100 h testing at 800 degrees C, the overcoated LSCF-GDC cathode exhibited respective polarization and ohmic area-specific-resistances 3 and 1.5 times lower than the pristine sample, whereas the pristine LSCF-GDC cathode degraded at a rate 4 times faster than the overcoated one. The multifunctionality of porosity, mixed conductivity, and suppressed Sr-enrichment enabled by the nanoscaled ALD-ZrO2 overcoats are attributed to the performance retention observed for the overcoated cathode.
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