Oxygen reduction kinetics enhancement on a heterostructured oxide surface for solid oxide fuel cells

Ethan J. Crumlin; Eva Mutoro; Sung Jin Ahn; Gerardo Jose La O; Donovan N. Leonard; Albina Borisevich; Michael D. Biegalski; Hans M. Christen; Yang Shao-Horn

doi:10.1021/jz101217d

Oxygen reduction kinetics enhancement on a heterostructured oxide surface for solid oxide fuel cells

Ethan J. Crumlin, Eva Mutoro, Sung Jin Ahn, Gerardo Jose La O, Donovan N. Leonard, Albina Borisevich, Michael D. Biegalski, Hans M. Christen, Yang Shao-Horn

Research output: Contribution to journal › Article › peer-review

154 Scopus citations

Abstract

Heterostructured interfaces of oxides, which can exhibit transport and reactivity characteristics remarkably different from those of bulk oxides, are interesting systems to explore in search of highly active cathodes for the oxygen reduction reaction (ORR). Here, we show that the ORR of ∼85 nm thick La_0.8Sr_0.2CoO_3-δ (LSC₁₁₃) films prepared by pulsed laser deposition on (001)-oriented yttria-stabilized zirconia (YSZ) substrates is dramatically enhanced (∼3-4 orders of magnitude above bulk LSC₁₁₃) by surface decorations of (La _0.5Sr_0.5)₂CoO_4±δ (LSC₂₁₄) with coverage in the range from ∼0.1 to ∼15 nm. Their surface and atomic structures were characterized by atomic force, scanning electron, and scanning transmission electron microscopy, and the ORR kinetics were determined by electrochemical impedance spectroscopy. Although the mechanism for ORR enhancement is not yet fully understood, our results to date show that the observed ORR enhancement can be attributed to highly active interfacial LSC₁₁₃/LSC₂₁₄ regions, which were shown to be atomically sharp.

Original language	English
Pages (from-to)	3149-3155
Number of pages	7
Journal	Journal of Physical Chemistry Letters
Volume	1
Issue number	21
DOIs	https://doi.org/10.1021/jz101217d
State	Published - Nov 4 2010
Externally published	Yes

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title = "Oxygen reduction kinetics enhancement on a heterostructured oxide surface for solid oxide fuel cells",

abstract = "Heterostructured interfaces of oxides, which can exhibit transport and reactivity characteristics remarkably different from those of bulk oxides, are interesting systems to explore in search of highly active cathodes for the oxygen reduction reaction (ORR). Here, we show that the ORR of ∼85 nm thick La0.8Sr0.2CoO3-δ (LSC113) films prepared by pulsed laser deposition on (001)-oriented yttria-stabilized zirconia (YSZ) substrates is dramatically enhanced (∼3-4 orders of magnitude above bulk LSC113) by surface decorations of (La 0.5Sr0.5)2CoO4±δ (LSC214) with coverage in the range from ∼0.1 to ∼15 nm. Their surface and atomic structures were characterized by atomic force, scanning electron, and scanning transmission electron microscopy, and the ORR kinetics were determined by electrochemical impedance spectroscopy. Although the mechanism for ORR enhancement is not yet fully understood, our results to date show that the observed ORR enhancement can be attributed to highly active interfacial LSC113/LSC214 regions, which were shown to be atomically sharp.",

author = "Crumlin, {Ethan J.} and Eva Mutoro and Ahn, {Sung Jin} and {La O}, {Gerardo Jose} and Leonard, {Donovan N.} and Albina Borisevich and Biegalski, {Michael D.} and Christen, {Hans M.} and Yang Shao-Horn",

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doi = "10.1021/jz101217d",

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T1 - Oxygen reduction kinetics enhancement on a heterostructured oxide surface for solid oxide fuel cells

AU - Crumlin, Ethan J.

AU - Mutoro, Eva

AU - Ahn, Sung Jin

AU - La O, Gerardo Jose

AU - Leonard, Donovan N.

AU - Borisevich, Albina

AU - Biegalski, Michael D.

AU - Christen, Hans M.

AU - Shao-Horn, Yang

PY - 2010/11/4

Y1 - 2010/11/4

N2 - Heterostructured interfaces of oxides, which can exhibit transport and reactivity characteristics remarkably different from those of bulk oxides, are interesting systems to explore in search of highly active cathodes for the oxygen reduction reaction (ORR). Here, we show that the ORR of ∼85 nm thick La0.8Sr0.2CoO3-δ (LSC113) films prepared by pulsed laser deposition on (001)-oriented yttria-stabilized zirconia (YSZ) substrates is dramatically enhanced (∼3-4 orders of magnitude above bulk LSC113) by surface decorations of (La 0.5Sr0.5)2CoO4±δ (LSC214) with coverage in the range from ∼0.1 to ∼15 nm. Their surface and atomic structures were characterized by atomic force, scanning electron, and scanning transmission electron microscopy, and the ORR kinetics were determined by electrochemical impedance spectroscopy. Although the mechanism for ORR enhancement is not yet fully understood, our results to date show that the observed ORR enhancement can be attributed to highly active interfacial LSC113/LSC214 regions, which were shown to be atomically sharp.

AB - Heterostructured interfaces of oxides, which can exhibit transport and reactivity characteristics remarkably different from those of bulk oxides, are interesting systems to explore in search of highly active cathodes for the oxygen reduction reaction (ORR). Here, we show that the ORR of ∼85 nm thick La0.8Sr0.2CoO3-δ (LSC113) films prepared by pulsed laser deposition on (001)-oriented yttria-stabilized zirconia (YSZ) substrates is dramatically enhanced (∼3-4 orders of magnitude above bulk LSC113) by surface decorations of (La 0.5Sr0.5)2CoO4±δ (LSC214) with coverage in the range from ∼0.1 to ∼15 nm. Their surface and atomic structures were characterized by atomic force, scanning electron, and scanning transmission electron microscopy, and the ORR kinetics were determined by electrochemical impedance spectroscopy. Although the mechanism for ORR enhancement is not yet fully understood, our results to date show that the observed ORR enhancement can be attributed to highly active interfacial LSC113/LSC214 regions, which were shown to be atomically sharp.

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JO - Journal of Physical Chemistry Letters

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Oxygen reduction kinetics enhancement on a heterostructured oxide surface for solid oxide fuel cells

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