Journal
JOURNAL OF POWER SOURCES
Volume 278, Issue -, Pages 623-629Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2014.12.110
Keywords
Solid oxide fuel cells; PrBaCo2O5+delta thin films; Pulsed laser deposition; Oriented layered structure; Electrochemical impedance spectroscopy; Anisotropic oxygen transport
Funding
- HKUST
- Research Grants Council of Hong Kong [DAG12EG06, ECS 639713]
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Oriented PrBaCo2O5+delta (PBC) thin films are prepared on yttria-stabilized ZrO2 (YSZ) substrates with orientations (001), (110) and (111) via pulsed laser deposition (PLD). Electrochemical impedance spectroscopy (EIS) experiments at various temperatures and oxygen partial pressures reveal a good oxygen reduction reaction (ORR) performance of all the thin films. However, the films' performance has considerable variance. PBC thin film deposited on (111) oriented YSZ had the best performance, followed by (110) and (001). Experiments including high resolution X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and computation, namely molecular dynamics (MD), are used to elucidate the substrate-determined orientations, examine the morphology and composition of the thin films, and to explain the variance of the ORR performance. Our results support the anisotropy of the oxygen vacancy pathway in the a-b plane and indicate that the substrate orientations can have great influence on the thin films properties. (C) 2014 Elsevier B.V. All rights reserved.
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