Electrochemical and microstructural analysis of nickel-yttria-stabilized zirconia electrode operated in phosphorus-containing syngas

Mingjia Zhi, Xinqi Chen, Harry Finklea, Ismail Celik, Nianqiang Q. Wu

Research output: Contribution to journalArticlepeer-review

70 Scopus citations

Abstract

Trace impurities in coal-derived syngas pose a threat on the performance and durability of solid oxide fuel cells (SOFCs) operated in syngas. A Ni-YSZ/YSZ/Ni-YSZ (YSZ stands for yttria-stabilized zirconia) half-cell is constructed in order to evaluate the effects of a phosphorus impurity on the performance of the Ni-YSZ cermet anode in the simulated coal-derived syngas containing 30.6% H2, 30% CO, 11.8% CO2, 27.6% H 2O and 20 ppm PH3. Electrochemical impedance analysis shows that both the charge transfer resistance and the diffusion resistance increase with time during exposure to the P-containing syngas. The diffusion resistance increases faster than the charge transfer resistance. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) studies show that phosphorus is incorporated into the Ni-YSZ electrode, leading to the formation of secondary phases of nickel phosphate and zirconium phosphate. The incorporation of phosphorus into the anode is accelerated by an applied electric field.

Original languageEnglish (US)
Pages (from-to)485-490
Number of pages6
JournalJournal of Power Sources
Volume183
Issue number2
DOIs
StatePublished - Sep 1 2008

Keywords

  • Anode
  • Degradation
  • Impurity
  • Solid oxide fuel cell
  • Syngas

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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