Ceria coatings effect on H2S poisoning of Ni/YSZ anodes for solid oxide fuel cells

Jeong Woo Yun, Sung Pil Yoon, Jonghee Han, Sanggyun Park, Hee Su Kim, SukWoo Nam

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Ceria is a good sulfur sorbent under reducing atmospheres because of its high affinity for sulfide at high temperatures. In this study, to enhance the sulfur tolerances of anodes for solid oxide fuel cells, we have used a dip-coating method to modify the pore wall surfaces of conventional nickel/yttria-stabilized zirconia (Ni/YSZ) anodes by coating them with ceria nanoparticles (10-20 nm). We have monitored the sulfur poisoning process in various H2 S concentrations at 700°C. Because the ceria reacted with H2 S to form Ce2 O2 S, which acted as a sulfur sorbent, Ni3 S2 was hardly formed in the ceria-coated Ni/YSZ anode; therefore, its performance dropped to a lesser degree relative to that of the conventional Ni/YSZ anode. Furthermore, impedance spectroscopy revealed that the polarization resistance increased upon increasing the H2 S concentration. Our results suggest that ceria nanocoatings on Ni-YSZ anodes provide greater sulfur tolerance at higher H2 S concentrations (200 ppm) and lower operating temperatures (700°C).

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume157
Issue number12
DOIs
Publication statusPublished - 2010 Nov 24
Externally publishedYes

Fingerprint

poisoning
Yttria stabilized zirconia
Cerium compounds
solid oxide fuel cells
yttria-stabilized zirconia
Solid oxide fuel cells (SOFC)
Nickel
Sulfur
Anodes
anodes
sulfur
nickel
coatings
Coatings
sorbents
Sorbents
Sulfides
operating temperature
coating
affinity

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

Ceria coatings effect on H2S poisoning of Ni/YSZ anodes for solid oxide fuel cells. / Yun, Jeong Woo; Yoon, Sung Pil; Han, Jonghee; Park, Sanggyun; Kim, Hee Su; Nam, SukWoo.

In: Journal of the Electrochemical Society, Vol. 157, No. 12, 24.11.2010.

Research output: Contribution to journalArticle

Yun, Jeong Woo ; Yoon, Sung Pil ; Han, Jonghee ; Park, Sanggyun ; Kim, Hee Su ; Nam, SukWoo. / Ceria coatings effect on H2S poisoning of Ni/YSZ anodes for solid oxide fuel cells. In: Journal of the Electrochemical Society. 2010 ; Vol. 157, No. 12.
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