Study of Activation Effect of Anodic Current on   La0.6Sr0.4Co0.2Fe0.8O3-delta Air Electrode in Solid Oxide Electrolyzer   Cell

doi:10.1016/j.electacta.2016.05.058

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	Study of Activation Effect of Anodic Current on La0.6Sr0.4Co0.2Fe0.8O3-delta Air Electrode in Solid Oxide Electrolyzer Cell
	Pan, Zehua ; Liu, Qinglin ; Zhang, Lan ; Zhang, Xiongwen ; Chan, Siew Hwa
刊名	ELECTROCHIMICA ACTA
	2016
关键词	La0.6Sr0.4Co0.2Fe0.8O3-delta Anodic polarization Stabilization and activation Solid oxide electrolyzer cell YTTRIA-STABILIZED ZIRCONIA SR SURFACE SEGREGATION FUEL-CELLS ELECTROCHEMICAL PERFORMANCE SOFC CATHODES INTERMEDIATE-TEMPERATURE DEGRADATION MECHANISMS COMPOSITE CATHODES OXYGEN ELECTRODES CARBON-DIOXIDE
DOI	10.1016/j.electacta.2016.05.058
英文摘要	Electrochemical performance evolution of La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF) air electrode polarized with anodic current is reported in this paper. The study was conducted on three-electrode half-cells with Yttria stabilized zirconia (YSZ) electrolyte using electrochemical impedance spectroscopy under equilibrium potential. Initially, the polarization resistance (RP) tested at 800 degrees C of the LSCF electrode sintered at 900 degrees C is 0.25 Omega cm(2). During the first 20 hours of testing with anodic current density of 0.2 A cm(-2), RP increased with a linear dependence on the square root of time, suggesting Sr surface segregation. After the first phase of tests RP stabilized at 0.68 Omega cm2. Continued testing at increased current density to 0.5 A cm(-2) showed that RP decreased from 0.68 to 0.46 Omega cm(2), and again to 0.39 Omega cm(2) at even higher bias of 1 A cm(-2). Moreover, short-term tests for 129 h under various currents again showed that RP decreased upon higher anodic current while increased upon lower anodic current. However, no obvious degradation on RP was shown by comparing the value before and after the test. Based on above results, the authors speculate that the application of anodic current may be able to stabilize and activate the performance of LSCF electrode through suppressing and mitigating Sr surface segregation. (C) 2016 Elsevier Ltd. All rights reserved.; National Research Foundation (NRF), Prime Minister's Office, Singapore under Campus for Research Excellence and Technological Enterprise (CREATE) programme; SCI(E); EI; ARTICLE; zpan001@e.ntu.edu.sg; mshchan@ntu.edu.sg; 56-64; 209
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/437053]
专题	工学院
推荐引用方式 GB/T 7714	Pan, Zehua,Liu, Qinglin,Zhang, Lan,et al. Study of Activation Effect of Anodic Current on La0.6Sr0.4Co0.2Fe0.8O3-delta Air Electrode in Solid Oxide Electrolyzer Cell[J]. ELECTROCHIMICA ACTA,2016.
APA	Pan, Zehua,Liu, Qinglin,Zhang, Lan,Zhang, Xiongwen,&Chan, Siew Hwa.(2016).Study of Activation Effect of Anodic Current on La0.6Sr0.4Co0.2Fe0.8O3-delta Air Electrode in Solid Oxide Electrolyzer Cell.ELECTROCHIMICA ACTA.
MLA	Pan, Zehua,et al."Study of Activation Effect of Anodic Current on La0.6Sr0.4Co0.2Fe0.8O3-delta Air Electrode in Solid Oxide Electrolyzer Cell".ELECTROCHIMICA ACTA (2016).