The Chemical Evolution of the La0.6Sr0.4CoO3-δ Surface Under SOFC Operating Conditions and Its Implications for Electrochemical Oxygen Exchange Activity

被引:79
作者
Opitz, Alexander K. [1 ]
Rameshan, Christoph [2 ]
Kubicek, Markus [1 ]
Rupp, Ghislain M. [1 ]
Nenning, Andreas [1 ,6 ]
Goetsch, Thomas [3 ]
Blume, Raoul [4 ]
Haevecker, Michael [4 ]
Knop-Gericke, Axel [4 ,5 ]
Rupprechter, Guenther [2 ]
Kloetzer, Bernhard [3 ]
Fleig, Juergen [1 ]
机构
[1] Vienna Univ Technol, Inst Chem Technol & Analyt, Getreidemarkt 9-164-EC, A-1060 Vienna, Austria
[2] Vienna Univ Technol, Inst Mat Chem, Getreidemarkt 9-165-PC, A-1060 Vienna, Austria
[3] Univ Innsbruck, Inst Phys Chem, Innrain 52c, A-6020 Innsbruck, Austria
[4] Max Planck Gesell, Dept Inorgan Chem, Fritz Haber Inst, Faradayweg 4-6, D-14195 Berlin, Germany
[5] Max Planck Inst Chem Energy Convers, Dept Heterogeneous React, Stiftstr 34-36, D-45413 Mulheim, Germany
[6] MIT, Dept Mat Sci & Engn, 77 Massachusetts Ave, Cambridge, MA 02139 USA
基金
奥地利科学基金会;
关键词
Oxygen reduction; SOFC cathode; Strontium segregation; NAP-XPS; Impedance spectroscopy; Perovskite-type electrode; RAY PHOTOELECTRON-SPECTROSCOPY; THIN-FILMS; IN-SITU; XPS CHARACTERIZATION; DEGREES-C; OXIDE; REDUCTION; CATHODE; PERFORMANCE; CHEMISTRY;
D O I
10.1007/s11244-018-1068-1
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
Owing to its extraordinary high activity for catalysing the oxygen exchange reaction, strontium doped LaCoO3 (LSC) is one of the most promising materials for solid oxide fuel cell (SOFC) cathodes. However, under SOFC operating conditions this material suffers from performance degradation. This loss of electrochemical activity has been extensively studied in the past and an accumulation of strontium at the LSC surface has been shown to be responsible for most of the degradation effects. The present study sheds further light onto LSC surface changes also occurring under SOFC operating conditions. In-situ near ambient pressure X-ray photoelectron spectroscopy measurements were conducted at temperatures between 400 and 790 degrees C. Simultaneously, electrochemical impedance measurements were performed to characterise the catalytic activity of the LSC electrode surface for O-2 reduction. This combination allowed a correlation of the loss in electro-catalytic activity with the appearance of an additional La-containing Sr-oxide species at the LSC surface. This additional Sr-oxide species preferentially covers electrochemically active Co sites at the surface, and thus very effectively decreases the oxygen exchange performance of LSC. Formation of precipitates, in contrast, was found to play a less important role for the electrochemical degradation of LSC.
引用
收藏
页码:2129 / 2141
页数:13
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