Atomic Layer Deposition Functionalized Composite SOFC Cathode La 0.6Sr0.4Fe0.8Co0.2O 3-δ -Gd0.2Ce0.8O1.9: Enhanced Long-term Stability

Abstract

We report that the long-term stability of a conventional mixed oxide-ion and electron conducting solid oxide fuel cell cathode, La0.6Sr 0.4Fe0.8Co0.2O3-δ-Gd 0.2Ce0.8O1.9 (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 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. © 2013 American Chemical Society.

Department(s)

Chemical and Biochemical Engineering

Keywords and Phrases

atomic layer deposition; cathode; solid oxide fuel cell; stability

International Standard Serial Number (ISSN)

1520-5002; 0897-4756

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 American Chemical Society, All rights reserved.

Publication Date

12 Nov 2013

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