Acta Phys. -Chim. Sin. ›› 2013, Vol. 29 ›› Issue (12): 2585-2591.doi: 10.3866/PKU.WHXB201310142

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Synthesis and Properties of SmBaCo2O5+δ Cathode Material via EDTA-Glycine Process

HU Zhi, HUANG Xiao-Wei, CHEN Yang-Hui   

  1. College of Materials Science and Engineering, Fuzhou University, Fuzhou 350116, P. R. China
  • Received:2013-07-18 Revised:2013-10-14 Published:2013-11-28
  • Contact: HUANG Xiao-Wei E-mail:xwhuang@fzu.edu.cn
  • Supported by:

    The project was supported by the Natural Science Foundation of Fujian Province, China (2008J0146).

Abstract:

SmBaCo2O5+δ (SBCO) was synthesized as a cathode material for intermediate temperature solid oxide fuel cells (IT-SOFC) via the EDTA-glycine process. The structure and properties of the material were measured by thermogravimetry-differential thermal analysis (TG-DTA), X-ray diffractometry (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), four-probe DC method, and AC impedance spectroscopy. The results indicated that a stable perovskite phase was formed after the initial powder was calcined at 850 ℃ for 5 h. The obtained powders revealed fine particles with good dispersion and homogeneous size distribution. SBCO had excellent high temperature chemical compatibility with Sm0.2Ce0.8O1.9 (SDC) electrolyte. The electrical conductivities of the SBCO reached 668-382 S·cm-1 in the temperature range 500-800 ℃. A symmetric half cell with SDC as electrolyte and SBCO as electrode was characterized by good three-phase interface bonding and high cathode catalytic activity. A polarization resistance of 0.0688 Ω·cm2 was achieved at 750 ℃ for the SBCO, far below that of SBCO synthesized by solid state reaction method (SSR), with an activation energy (Ea) of 122.21 kJ·mol-1.

Key words: Intermediate temperature solid oxide fuel cell, SmBaCo2O5+δ, Double perovskite, Cathode, Electrochemical performance

MSC2000: 

  • O646