Influence of cathode functional layer composition on electrochemical performance of solid oxide fuel cells

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• 作者：Antônio de Pádua Lima Fernandes…
• 刊名：Journal of Solid State Electrochemistry
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：20
• 期：9
• 页码：2575-2580
• 全文大小：4,084 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Physical Chemistry
  Analytical Chemistry
  Industrial Chemistry and Chemical Engineering
  Characterization and Evaluation Materials
  Condensed Matter
  Electronic and Computer Engineering
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1433-0768
• 卷排序：20

文摘

In this work, anode-supported solid oxide fuel cells (SOFC) were tested with a yttria-stabilized zirconia (YSZ) (8 mol% Y₂O₃-ZrO₂)/gadolinium-doped ceria (GDC) (Ce_0.9Gd _0.1O_1.95) bilayer electrolyte and two lanthanum strontium cobalt ferrite (LSCF) composition as functional cathode layer: La_0.6Sr_0.4Co_0.8Fe_0.2O_3-δ (LSCF 1) and La_0.60Sr_0.40Co_0.2Fe_0.8O_3-δ (LSCF 2). The functional cathode layers were made of 50 % (w/w) LSCF and 50 % (w/w) GDC. Microstructural characterization was performed by scanning electron microscopy and X-ray diffraction. Electrochemical impedance spectroscopy (EIS) and power measurements were performed under oxygen and hydrogen atmospheres. The microscopy studies showed that the LSCF 2 functional layer is more uniform and adherent to the electrolyte and the cathode collector than the LSCF 1 functional layer, which has cracks, chips, and lower adhesion. The use of the LSCF 2 layer allowed an approximately 25-fold reduction in ohmic resistance (0.06 Ω cm−2) compared with the LSCF 1 layer (1.5 Ω cm−2). The power measurements showed a considerable increase in the power cell using LSCF 2 (approximately 420 mW cm−2) compared with the power cell using LSCF 1 (approximately 180 mW cm−2).KeywordsSOFCLSCFInterfaceElectrochemical performanceCathodeFunctional layer