Improvement of anode performance by surface modification for solid oxide fuel cell running on hydrocarbon fuel

Sung Pil Yoon, Jonghee Han, SukWoo Nam, Tae Hoon Lim, Seong Ahn Hong

Research output: Contribution to journalArticle

80 Citations (Scopus)

Abstract

A Ni/yttria-stabilized zirconia (YSZ) cermet anode was modified by coating with samaria-doped ceria (SDC, Sm0.2Ce0.8O2) sol within the pores of the anode for a solid oxide fuel cell (SOFC) running on hydrocarbon fuel. The surface modification of Ni/YSZ anode resulted in an increase of structural stability and enlargement of the triple phase boundary, which could serve as a catalytic reaction site for oxidation of carbon or CO. The anode polarization became four-times lower by sol-gel coating than using an unmodified anode. Consequently, the SDC coating on the pores of anode made it possible to have good stability for long-term operation due to low carbon deposition and nickel sintering. The maximum power density of an anode-supported cell (electrolyte; 8 mole % YSZ and thickness of 30 μm, and cathode; La0.85Sr0.15MnO3) with the modified anode was ∼ 0.3 w/sq cm at 700°C in the mixture of methane (25%) and air (75%) as the fuel and air as the oxidant. The modified cell was successfully operated for > 1000 hr without significant degradation of cell performance due to an increase of the structural and catalytic stability with the SDC coating on the anode.

Original languageEnglish
Pages (from-to)30-36
Number of pages7
JournalJournal of Power Sources
Volume136
Issue number2
DOIs
Publication statusPublished - 2004 Oct 1

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Keywords

  • Carbon deposition
  • Hydrocarbon fuel
  • Partial oxidation of methane
  • Solid oxide fuel cell
  • Surface modification

ASJC Scopus subject areas

  • Energy (miscellaneous)

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