The effect of a ceria coating on the H2S tolerance of a molten carbonate fuel cell

Hary Devianto, Sung Pil Yoon, SukWoo Nam, Jonghee Han, Tae Hoon Lim

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

To enhance the performance of anodes in molten carbonate fuel cells (MCFCs), in terms of their sulfur tolerance, we modified the surface characteristics of a conventional Ni-10 wt% Cr anode through dip coating using a ceria sol. The performance of the ceria-coated anode was 0.4 V higher than that of the uncoated anode when H2S (80 ppm) was introduced under a current density of 150 mA cm-2 for 180 h. H2S acted as a poison of the non-modified Ni electrode, regardless of its operating conditions, to form Ni3S2, which caused the voltage drop. The ceria-coated anode had the ability to suppress such a voltage drop because ceria can react with H2S to form Ce2O2S. Our results suggest that the presence of a CeO2 coating layer can reduce the degree of sulfur poisoning of the anode under the operating conditions - e.g., a reducing atmosphere and a high temperature - experienced by MCFCs.

Original languageEnglish
Pages (from-to)1147-1152
Number of pages6
JournalJournal of Power Sources
Volume159
Issue number2
DOIs
Publication statusPublished - 2006 Sep 22

Keywords

  • Anode
  • Ceria
  • MCFC
  • Sulfur
  • Surface modification
  • Wettability

ASJC Scopus subject areas

  • Electrochemistry
  • Fuel Technology
  • Materials Chemistry
  • Energy (miscellaneous)

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