期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 7, 期 22, 页码 13531-13539出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta04020j
关键词
-
资金
- National Science Foundation [OISE-1545907, DMR-1506925]
- State Scholarship Fund of China Scholarship Council [201606285002]
- So. and Hybrid Nanotechnology Experimental (SHyNE) Resource [NSF ECCS-1542205]
- MRSEC program at the Materials Research Center [NSF DMR-1121262]
- International Institute for Nanotechnology (IIN)
- Keck Foundation
- State of Illinois, through the IIN
- MRSEC Program of the Materials Research Center at Northwestern University [NSF DMR-1720139]
Solid oxide cells operated reversibly between fuel cell and electrolysis modes are promising for energy storage with extremely high capacity. La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF) has become the dominant oxygen electrode material in electrolysis and reversible operation. However, LSCF has been widely reported to degrade due to Sr surface segregation. The present understanding is that the segregation rate and hence the degradation rate increases with increasing temperature and current density. Here we present a study of LSCF electrode performance and stability carried out with a series of extended life tests (1000 hours) over a range of temperatures and reversing current densities. Although the results at lower temperatures (650-700 degrees C) show the expected increase in segregation-induced degradation with increasing current density, at higher temperature (750 degrees C) stability is improved and the electrodes become fully stable at the highest current density of 1.5 A cm(-2), maintaining a stable polarization resistance of 0.08 Omega cm(2). This unexpected result is explained by the increased electrochemical activity of LSCF at the higher temperature and a very rapid development of a stable surface segregated Sr layer.
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