Oxygen electrocatalysis on (001)-oriented manganese perovskite films: Mn valency and charge transfer at the nanoscale

被引：140

作者：

Stoerzinger, Kelsey A. ^{[1
,2
]}

Risch, Marcel ^{[2
]}

Suntivich, Jin ^{[3
]}

Lue, W. M. ^{[4
,5
]}

Zhou, Jigang ^{[6
]}

Biegalski, Michael D. ^{[7
]}

Christen, Hans M. ^{[7
]}

Ariando ^{[5
,8
]}

Venkatesan, T. ^{[4
,5
,8
]}

Shao-Horn, Yang ^{[1
,2
,9
]}

机构：

[1] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA

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

[3] Harvard Univ, Ctr Environm, Cambridge, MA 02138 USA

[4] Natl Univ Singapore, Dept Elect & Comp Engn, Singapore 117583, Singapore

[5] Natl Univ Singapore, NUSNNI NanoCore, Singapore 117411, Singapore

[6] Canadian Light Source, Saskatoon, SK S7N 2V3, Canada

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

[8] Natl Univ Singapore, Dept Phys, Singapore 117542, Singapore

[9] MIT, Dept Mech Engn, Cambridge, MA 02139 USA

来源：

ENERGY & ENVIRONMENTAL SCIENCE | 2013年 / 6卷 / 05期

基金：

美国国家科学基金会; 加拿大自然科学与工程研究理事会;

关键词：

REDUCTION REACTION; OXIDE CATALYSTS; CARBON; NANOWIRES; EVOLUTION; ELECTRODE; WATER;

D O I：

10.1039/c3ee40321a

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report that the oxygen reduction reaction (ORR) activities of (001)-oriented manganese perovskite films decrease from 10 to 1 nm by more than an order of magnitude, which can be attributed to the barrier associated with interfacial band bending that impedes electron transfer to the electrolyte, and reduction of Mn3+ due to charge transfer from the Nb:SrTiO3 substrate. Furthermore, we show by substitution in La1-x(Ca,Sr)(x)MnO3 that Mn3+, not Mn4+, is the active valence state for ORR.

引用

页码：1582 / 1588

页数：7

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