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  Oxygen Exchange Activity of La-Sr-Co-O PLD Films and Quantification of (La,Sr)CoO3-δ/(La,Sr)2CoO4+δ/O2 Triple Phase Boundary Activity

Stämmler, S., Merkle, R., & Maier, J. (2017). Oxygen Exchange Activity of La-Sr-Co-O PLD Films and Quantification of (La,Sr)CoO3-δ/(La,Sr)2CoO4+δ/O2 Triple Phase Boundary Activity. Journal of The Electrochemical Society, 164(4), F454-F463.

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Item Permalink: https://hdl.handle.net/21.11116/0000-000E-D248-4 Version Permalink: https://hdl.handle.net/21.11116/0000-000E-D249-3
Genre: Journal Article

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Stämmler, S., Author
Merkle, R.1, Author           
Maier, J.1, Author           
Affiliations:
1Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society, ou_3370483              

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 Abstract: Thin compact La-Sr-Co-O composite films consisting of (La,Sr)CoO3-delta and (La,Sr)(2)CoO4+delta crystallites were prepared by compositional phase separation during pulsed laser deposition. While the total La: Sr ratio is kept constant at 70: 30, different phase ratios and crystallite sizes are investigated. The effect of hetero-interfaces on the oxygen reduction reaction (ORR) kinetics was investigated by impedance spectroscopy. The enhancement relative to the appropriate reference activity is quantified in terms of the triple phase boundary (TPB) length specific activity k(TPB)', resulting in k(TPB)' = 2-9 . 10(-13) cm(2)/s at 600 degrees C. A metastable Co-deficient perovskite phase La0.7Sr0.3Co0.9O3-delta formed in La-Sr-Co-O films under certain conditions was found to be highly active with an effective rate constant k(q) = 3 . 10(-6) cm/s at 600 degrees C, representing one possible source for the activity enhancement in these composite films. (C) The Author(s) 2017. Published by ECS. All rights reserved.

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Language(s): eng - English
 Dates: 2017
 Publication Status: Issued
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 734824
ISI: 000400958600158
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Title: Journal of The Electrochemical Society
Source Genre: Journal
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Publ. Info: PENNINGTON : ELECTROCHEMICAL SOC INC
Pages: - Volume / Issue: 164 (4) Sequence Number: - Start / End Page: F454 - F463 Identifier: ISSN: 0013-4651