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题名: Promoting effect of YSZ on the electrochemical performance of YSZ+LSM composite electrodes
作者: Wang, SZ;  Jiang, Y;  Zhang, YH;  Yan, JW;  Li, WZ
关键词: yttria-stabilized zirconia ;  LSM perovskite ;  electrochemical performance
刊名: SOLID STATE IONICS
发表日期: 1998-12-01
卷: 113, 页:291-303
收录类别: ISTP ;  SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical ;  Physics, Condensed Matter
研究领域[WOS]: Chemistry ;  Physics
英文摘要: In the present study, the YSZ + La0.8Sr0.2MnO3 composite electrodes with addition of varying amounts of YSZ have been prepared on YSZ plates by a screen printing method. The electrodes were then examined by SEM and studied by AC impedance, cyclic voltammetry, potential step as well as polarization technique. For the oxygen reduction reaction on the pure LSM electrode, the dissociative adsorption of oxygen on the LSM surface and the transfer of oxygen ions from three phase boundary (TPB) to the YSZ electrolyte lattice were found to be two comparable rate determining steps. The electrochemical resistance of the former step was -0.5 power of dependence on p(O2), with a high activation energy of similar to 2.0 eV. While the electrochemical resistance of the latter step was characterized with p(O2) independence and a low activation energy of similar to 1.0 eV. With addition of YSZ to the LSM electrode, the electrochemical activity was improved substantially with much lower electrochemical resistances for both steps. Furthermore, the dissociative adsorption of oxygen became less rate determining on the electrode with more YSZ addition. It was found that the transfer of oxygen ion was the only rate determining step on the 40% YSZ+LSM electrode. The improvement in the electrochemical performance with addition of YSZ was found mainly due to the spatial enlargement of TPB area, which increased the electrochemical active sites for the oxygen adsorption and charge transfer reaction. The intimate sintering of YSZ particles to the YSZ substrate and then the formation of the spatial TPB area were directly found by SEM examination and was further confirmed by the increasing cathodic currents from the TPB area, which were separated from the total currents using potential step technique. (C) 1998 Published by Elsevier Science B.V. All rights reserved.
关键词[WOS]: YTTRIA-STABILIZED ZIRCONIA ;  OXIDE FUEL-CELL ;  IMPEDANCE SPECTROSCOPY ;  CATHODIC POLARIZATION ;  OXYGEN REDUCTION ;  KINETICS ;  LAMNO3
语种: 英语
WOS记录号: WOS:000077868800042
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138123
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China

Recommended Citation:
Wang, SZ,Jiang, Y,Zhang, YH,et al. Promoting effect of YSZ on the electrochemical performance of YSZ+LSM composite electrodes[J]. SOLID STATE IONICS,1998,113:291-303.
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