Effects of the Sm0.2Ce0.8O2-δ modification of a ni-based anode on the H2S tolerance for intermediate temperature solid oxide fuel cells

Jeong Woo Yun, Hyung Chul Ham, Hee Su Kim, Shin Ae Song, SukWoo Nam, Sung Pil Yoon

Research output: Contribution to journalArticle

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Abstract

The H2S tolerance and stability of a Sm0.2Ce 0.8O2-δ coating on the Ni/YSZ anode pore wall surface was investigated. The sulfur poisoning mechanisms were studied for various H2S concentrations (0-100 ppm) and temperatures (600°C and 700°C) under both open circuit voltage (OCV) and current-loading conditions. For the unmodified Ni/YSZ anode under current-loading conditions, the cell performance decreased significantly with the introduction of H 2S, as the sulfur strongly adsorbed at the electrochemical reaction sites (ERSs). For the SDC-modified Ni/YSZ anode under the OCV conditions, the governing mechanism of the H2S poisoning was the formation of Ce 2O2S with low oxygen ion conductivities, making the oxygen ion path disconnected. For the SDC-modified anode under current-loading conditions, the mixed ionic and electronic conductivity (MIEC) of the SDC allowed the electrochemical reactions to occur mainly at the SDC/fuel interface (2PB). With these conditions, the adsorbed sulfur was easily removed by the electrochemical oxidation. The decrease in the sulfur poisoning effect resulted in stable cell performances at 500 ppm of H2S over 800 h.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume160
Issue number2
DOIs
Publication statusPublished - 2013 Apr 2
Externally publishedYes

Fingerprint

solid oxide fuel cells
Solid oxide fuel cells (SOFC)
Sulfur
Anodes
anodes
poisoning
sulfur
yttria-stabilized zirconia
Open circuit voltage
oxygen ions
open circuit voltage
Ions
Oxygen
Temperature
temperature
Electrochemical oxidation
conductivity
electrochemical oxidation
cells
ion currents

ASJC Scopus subject areas

  • Electrochemistry
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics

Cite this

Effects of the Sm0.2Ce0.8O2-δ modification of a ni-based anode on the H2S tolerance for intermediate temperature solid oxide fuel cells. / Yun, Jeong Woo; Ham, Hyung Chul; Kim, Hee Su; Song, Shin Ae; Nam, SukWoo; Yoon, Sung Pil.

In: Journal of the Electrochemical Society, Vol. 160, No. 2, 02.04.2013.

Research output: Contribution to journalArticle

Yun, Jeong Woo ; Ham, Hyung Chul ; Kim, Hee Su ; Song, Shin Ae ; Nam, SukWoo ; Yoon, Sung Pil. / Effects of the Sm0.2Ce0.8O2-δ modification of a ni-based anode on the H2S tolerance for intermediate temperature solid oxide fuel cells. In: Journal of the Electrochemical Society. 2013 ; Vol. 160, No. 2.
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