Enhanced oxygen reduction activity on surface-decorated perovskite thin films for solid oxide fuel cells

Handle URI:
http://hdl.handle.net/10754/598186
Title:
Enhanced oxygen reduction activity on surface-decorated perovskite thin films for solid oxide fuel cells
Authors:
Mutoro, Eva; Crumlin, Ethan J.; Biegalski, Michael D.; Christen, Hans M.; Shao-Horn, Yang
Abstract:
Surface-decoration of perovskites can strongly affect the oxygen reduction activity, and therefore is a new and promising approach to improve SOFC cathode materials. In this study, we demonstrate that a small amount of secondary phase on a (001) La 0.8Sr 0.2CoO 3-δ (LSC) surface can either significantly activate or passivate the electrode. LSC (001) microelectrodes prepared by pulsed laser deposition on a (001)-oriented yttria-stabilized zirconia (YSZ) substrate were decorated with La-, Co-, and Sr-(hydr)oxides/carbonates. "Sr"-decoration with nanoparticle coverage in the range from 50% to 80% of the LSC surface enhanced the surface exchange coefficient, k q, by an order of magnitude while "La"- decoration and "Co"-decoration led to no change and reduction in k q, respectively. Although the physical origin for the enhancement is not fully understood, results from atomic force microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy suggest that the observed k q enhancement for "Sr"-decorated surfaces can be attributed largely to catalytically active interface regions between surface Sr-enriched particles and the LSC surface. © 2011 The Royal Society of Chemistry.
Citation:
Mutoro E, Crumlin EJ, Biegalski MD, Christen HM, Shao-Horn Y (2011) Enhanced oxygen reduction activity on surface-decorated perovskite thin films for solid oxide fuel cells. Energy Environ Sci 4: 3689. Available: http://dx.doi.org/10.1039/c1ee01245b.
Publisher:
Royal Society of Chemistry (RSC)
Journal:
Energy & Environmental Science
Issue Date:
2011
DOI:
10.1039/c1ee01245b
Type:
Article
ISSN:
1754-5692; 1754-5706
Sponsors:
This work was supported in part by DOE (SISGR DE-SC0002633) and King Abdullah University of Science and Technology. E. Mutoro is grateful for financial support from the German Research Foundation (DFG research scholarship). The authors like to thank the King Fahd University of Petroleum and Minerals in Dharam, Saudi Arabia, for funding the research reported in this paper through the Center for Clean Water and Clean Energy at MIT and KFUPM. The PLD preparation performed at the Center of Nanophase Materials Sciences was sponsored by the Scientific User Facilities Division, Office of Basic Energy Science, U.S. DOE. The authors thank Prof. C. Ross (MIT) for the usage of PLD.
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Full metadata record

DC FieldValue Language
dc.contributor.authorMutoro, Evaen
dc.contributor.authorCrumlin, Ethan J.en
dc.contributor.authorBiegalski, Michael D.en
dc.contributor.authorChristen, Hans M.en
dc.contributor.authorShao-Horn, Yangen
dc.date.accessioned2016-02-25T13:14:19Zen
dc.date.available2016-02-25T13:14:19Zen
dc.date.issued2011en
dc.identifier.citationMutoro E, Crumlin EJ, Biegalski MD, Christen HM, Shao-Horn Y (2011) Enhanced oxygen reduction activity on surface-decorated perovskite thin films for solid oxide fuel cells. Energy Environ Sci 4: 3689. Available: http://dx.doi.org/10.1039/c1ee01245b.en
dc.identifier.issn1754-5692en
dc.identifier.issn1754-5706en
dc.identifier.doi10.1039/c1ee01245ben
dc.identifier.urihttp://hdl.handle.net/10754/598186en
dc.description.abstractSurface-decoration of perovskites can strongly affect the oxygen reduction activity, and therefore is a new and promising approach to improve SOFC cathode materials. In this study, we demonstrate that a small amount of secondary phase on a (001) La 0.8Sr 0.2CoO 3-δ (LSC) surface can either significantly activate or passivate the electrode. LSC (001) microelectrodes prepared by pulsed laser deposition on a (001)-oriented yttria-stabilized zirconia (YSZ) substrate were decorated with La-, Co-, and Sr-(hydr)oxides/carbonates. "Sr"-decoration with nanoparticle coverage in the range from 50% to 80% of the LSC surface enhanced the surface exchange coefficient, k q, by an order of magnitude while "La"- decoration and "Co"-decoration led to no change and reduction in k q, respectively. Although the physical origin for the enhancement is not fully understood, results from atomic force microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy suggest that the observed k q enhancement for "Sr"-decorated surfaces can be attributed largely to catalytically active interface regions between surface Sr-enriched particles and the LSC surface. © 2011 The Royal Society of Chemistry.en
dc.description.sponsorshipThis work was supported in part by DOE (SISGR DE-SC0002633) and King Abdullah University of Science and Technology. E. Mutoro is grateful for financial support from the German Research Foundation (DFG research scholarship). The authors like to thank the King Fahd University of Petroleum and Minerals in Dharam, Saudi Arabia, for funding the research reported in this paper through the Center for Clean Water and Clean Energy at MIT and KFUPM. The PLD preparation performed at the Center of Nanophase Materials Sciences was sponsored by the Scientific User Facilities Division, Office of Basic Energy Science, U.S. DOE. The authors thank Prof. C. Ross (MIT) for the usage of PLD.en
dc.publisherRoyal Society of Chemistry (RSC)en
dc.titleEnhanced oxygen reduction activity on surface-decorated perovskite thin films for solid oxide fuel cellsen
dc.typeArticleen
dc.identifier.journalEnergy & Environmental Scienceen
dc.contributor.institutionMassachusetts Institute of Technology, Cambridge, United Statesen
dc.contributor.institutionOak Ridge National Laboratory, Oak Ridge, United Statesen
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