期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 4, 期 15, 页码 2493-2499出版社
AMER CHEMICAL SOC
DOI: 10.1021/jz401271m
关键词
-
类别
资金
- U.S. Department of Energy [SISGR DE-SC0002633]
- Oak Ridge National Laboratory
- Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy
- National Science Foundation [DMR-08-19762]
The slow kinetics of oxygen surface exchange hinders the efficiency of high-temperature oxygen electrocatalytic devices such as solid oxide fuel cells and oxygen separation membranes. Systematic investigations of material properties that link to catalytic activity can aid in the rational design of highly active cathode materials. Here, we explore LaCoO3 thin films as a model system for tuning catalytic activity through strain-induced changes in the Co spin state. We demonstrate that Raman spectroscopy can be used to probe the Co-O bond strength at different temperatures to determine the relative spin occupancies of LaCoO3. We find that strain can be used to reduce the spin transition temperature and promote the occupation of higher spin states that weaken the Co-O bond. The decrease in Co-O bond strength and increased spin moment of the thin films result in significant enhancements of the oxygen surface exchange kinetics by up to 2 orders of magnitude.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据