Atomic layer deposition of yttria-stabilized zirconia for solid oxide fuel cells

Joon Hyung Shim, Cheng Chieh Chao, Hong Huango, Fritz B. Prinz

Research output: Contribution to journalArticle

357 Citations (Scopus)

Abstract

Yttria-stabilized zirconia (YSZ) films were synthesized by atomic layer deposition (ALD). Tetrakis-(dimethylamido)zirconium and tris(methylcyclopentadienyl)yttrium were used as ALD precursors with distilled water as oxidant. From X-ray photoelectron spectroscopy (XPS) compositional analysis, the yttria content was identified to increase proportionally to the pulse ratio of Y/Zr. Accordingly, the target stoichiometry ZrO 2/Y 2O 3 = 0.92:0.08 was achieved. Crystal and grain structures of ALD YSZ films grown on amorphous Si 3N 4 were analyzed by X-ray diffraction (XRD) and atomic force microscopy (AFM). The microstructure of the polycrystalline films consisted of grains of tens of nanometers in diameter. To evaluate ALD YSZ films as oxide ion conductor, freestanding 60 nm films were prepared with porous platinum electrodes on both sides of the electrolyte. This structure served as a solid oxide fuel cell designed to operate at low temperatures. Maximum power densities of 28 mW/cm 2, 66 mW/cm 2, and 270 mW/cm 2 were observed at 265°C, 300°C, and 350°C, respectively. The high performance of thin film ALD electrolyte fuel cells is related to low electrolyte resistance and fast electrode kinetics. The exchange current density at the electrode-electrolyte interface was approximately 4 orders of magnitude higher compared to reference Pt-YSZ values.

Original languageEnglish
Pages (from-to)3850-3854
Number of pages5
JournalChemistry of Materials
Volume19
Issue number15
DOIs
Publication statusPublished - 2007 Jul 24
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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