Electrochemical characteristics of electrospun La0.6Sr 0.4Co0.2Fe0.8O3-δ-Gd 0.1Ce0.9O1.95 cathode

Jin Goo Lee, Myeong Geun Park, Jeong Ho Park, Yong Gun Shul

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Abstract

The poor activity of cathode materials for electrochemical reduction of oxygen in intermediate and low temperature regime (<700 °C) is a key obstacle to reduced-temperature operation of solid oxide fuel cells (SOFCs). In our previous work, the direct methane fuel cell exhibits approximately 1 W cm-2 at 650 °C in hydrogen atmosphere without any functional layers when the electrospun LSCF-GDC cathode was applied into the La 2Sn2O7-Ni-GDC anode-supported cell, which is approximately two times higher performance than 0.45 W cm-2 of the cell with the conventional LSCF-GDC cathode. For detailed analysis of the fibrous cathode, the symmetrical cells with the electrospun and conventional LSCF-GDC cathode are fabricated, and then their electrochemical characteristics are measured by using electrochemical impedance spectroscopy (EIS). Each resistance contribution is determined by equivalent circuit consisting of a series resistance (Rs) and three arcs to describe the polarization resistance of the cathode. Total polarization resistance of the electrospun LSCF-GDC cathode is approximately two times lower than that of the conventional LSCF-GDC cathode at 650 °C, which is attributed to fibrous microstructures and large amount of pores in 100-200 nm. The results correspond to the difference in the cell performances obtained from our previous work.

Original languageEnglish
Pages (from-to)8053-8060
Number of pages8
JournalCeramics International
Volume40
Issue number6
DOIs
Publication statusPublished - 2014 Jul

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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