Articles
  • Electrode properties of porous La2NiO4+δ layers screen-printed on a Ce0.8Sm0.2O2-δ electrolyte
  • Qing Xua,*, Kai Zhaoa, Duan-Ping Huanga, Bok-Hee Kimb,*, Min Chenb and Hong Wanga
  • a School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, People's Republic of China b Department of Hydrogen and Fuel Cells Engineering, Hydrogen & Fuel Cell Research Center, Chonbuk National University, Jeonju 561756, Korea
Abstract
A La2NiO4+δ/Ce0.8Sm0.2O2-δ/La2NiO4+δ symmetrical cell was prepared using a screen-printing method by sintering at 1100 oC. The electrochemical properties of the cell were examined by the impedance spectroscopy technique under zero dc bias in air between 500-700 oC. The La2NiO4+δ electrodes displayed satisfactory chemical and thermodynamic compatibilities with the Ce0.8Sm0.2O2-δ electrolyte. A comparatively low area specific resistance of 0.18 Ω cm2 at 700 oC was determined for the La2NiO4+δ electrodes. Scanning electron microscope (SEM) observation revealed that the La2NiO4+δ electrodes showed a reasonable porosity, a well-necked connection among fine grains and a tight adhesion to the electrolyte support. The desired microstructure is regarded to be responsible for the superior electrode properties of the La2NiO4+δ layers.

Keywords: La2NiO4+δ, Mixed conductor, Electrode properties, Screen-printing, Ce0.8Sm0.2O2-δ electrolyte.

This Article

  • 2009; 10(2): 202-207

    Published on Apr 30, 2009