Performance of anode-supported solid oxide fuel cell with La0.85Sr0.15MnO3 cathode modified by sol-gel coating technique

Sung Pil Yoon, Jonghee Han, Suk Woo Nam, Tae Hoon Lim, In Hwan Oh, Seong Ahn Hong, Young Sung Yoo, Hee Chun Lim

Research output: Contribution to journalConference article

84 Citations (Scopus)

Abstract

Yttria-stabilized zirconia (8mol%; YSZ) or samaria-doped ceria (Sm0.2Ce0.8O2; SDC)-modified La0.85Sr0.15MnO3 (LSM) composite cathodes were fabricated by formation of an YSZ or SDC film at the triple-phase boundary (TPB) of LSM/YSZ/gas. The YSZ film greatly enlarged the number of electrochemical reaction sites (ERSs) by increasing the TPB. The composite cathode was formed on thin YSZ electrolyte (about 30 μm thickness) supported on an anode and then I-V characterization and ac impedance analyses were performed at temperatures between 700 and 800 °C. As a result of the impedance analysis on the cell at 800 °C, with humidified hydrogen as the fuel and air as the oxidant, the element R1 around the frequency of 1000 Hz is identified as the anode polarization, R2 around the frequency of 100 Hz is identified as the cathode polarization and R3 below the frequency of 10 Hz is the resistance of gas phase diffusion through the anode. The maximum power densities of the cell modified by the SDC sol-gel coating were about 0.53W/cm2 at 750 °C and about 0.19W/cm2 at 650 °C. The result implied that deposition of SDC in the pore surface of the cathode increased the area of the TPB, resulting in a decrease of cathode polarization and improved cell performance.

Original languageEnglish
Pages (from-to)160-166
Number of pages7
JournalJournal of Power Sources
Volume106
Issue number1-2
DOIs
Publication statusPublished - 2002 Apr 1
Event7th Grove Fuel Cell Symposium, Grove VII - London, United Kingdom
Duration: 2001 Sep 112001 Sep 13

Keywords

  • Anode-supported SOFC
  • High performance cathode
  • Impedance analysis
  • Reduced-temperature SOFCs
  • Sol-gel coating

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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    Yoon, S. P., Han, J., Nam, S. W., Lim, T. H., Oh, I. H., Hong, S. A., Yoo, Y. S., & Lim, H. C. (2002). Performance of anode-supported solid oxide fuel cell with La0.85Sr0.15MnO3 cathode modified by sol-gel coating technique. Journal of Power Sources, 106(1-2), 160-166. https://doi.org/10.1016/S0378-7753(01)01037-0