Effect of Sm0.2Ce0.8O1.9 on the carbon coking in Ni-based anodes for solid oxide fuel cells running on methane fuel

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

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

To directly use hydrocarbon fuel without a reforming process, a new microstructure for Ni/Sm0.2Ce0.8O2-δ (Ni/SDC) anodes, in which the Ni surface of the anode is covered with a porous Sm0.2Ce0.8O2-δ thin film, was investigated as an alternative to conventional Ni/YSZ anodes. The porous SDC thin layer was coated on the pores of the anode using the sol-gel coating method. The cell performance was improved by 20%-25% with the Ni/SDC anode relative to the cell performance with the Ni/YSZ anode due to the high ionic conductivity of the Ni/SDC anode and the increase of electrochemical reaction sites. For the SDC-coated Ni/SDC anode operating with methane fuel, no significant degradation of the cell performance was observed after 180 h due to the surface modification with the SDC film on the Ni surface, which opposes the severe degradation of the cell performance that was observed for the Ni/YSZ anode, which results from carbon deposition by methane cracking. Carbon was hardly detected in the SDC-coated Ni/SDC anode due to the catalytic oxidation of the deposited carbon on the SDC film as well as the electrochemical oxidation of methane in the triple-phase-boundary.

Original languageEnglish
Pages (from-to)4356-4366
Number of pages11
JournalInternational Journal of Hydrogen Energy
Volume37
Issue number5
DOIs
Publication statusPublished - 2012 Mar 1

Keywords

  • Carbon deposition
  • Electrochemical oxidation
  • Methane
  • SDC coating
  • Solid oxide fuel cell

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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