Oxygen Reduction Kinetics Enhancement on a Heterostructured Oxide Surface for Solid Oxide Fuel Cells

被引：148

作者：

Crumlin, Ethan J. ^{[1
]}

Mutoro, Eva ^{[1
]}

Ahn, Sung-Jin ^{[1
]}

la O', Gerardo Jose ^{[1
]}

Leonard, Donovan N. ^{[2
]}

Borisevich, Albina ^{[2
]}

Biegalski, Michael D. ^{[3
]}

Christen, Hans M. ^{[3
]}

Shao-Horn, Yang ^{[1
]}

机构：

[1] MIT, Electrochem Energy Lab, Cambridge, MA 02139 USA

[2] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

[3] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2010年 / 1卷 / 21期

关键词：

DOPED LAMNO3 MICROELECTRODES; THIN-FILM MICROELECTRODES; LA1-XSRXMN1-YCOYO3+/-DELTA PEROVSKITES; GEOMETRY DEPENDENCE; IONIC-CONDUCTIVITY; POLARIZATION; EXCHANGE; CATHODE; TRANSPORT; (LA; SR)COO3/(LA; SR)(2)COO4;

D O I：

10.1021/jz101217d

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 similar to 85 nm thick La0.8Sr0.2-CoO3-delta (LSC113) films prepared by pulsed laser deposition on (001)-oriented yttria-stabilized zirconia (YSZ) substrates is dramatically enhanced (similar to 3-4 orders of magnitude above bulk LSC113) by surface decorations of (La0.5Sr0.5)(2)CoO4 +/-delta (LSC214) with coverage in the range from similar to 0.1 to similar 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.

引用

页码：3149 / 3155

页数：7

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