Evidence of proton transport in atomic layer deposited yttria-stabilized zirconia films

Joong Sun Park, Young Beom Kim, Joon Hyung Shim, Sangkyun Kang, Turgut M. Gür, Fritz B. Prinz

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

This study presents spectroscopic and electrochemical evidence that verifies proton transport in the temperature regime 300-450 °C in yttria-stabilized zirconia (YSZ) thin film membranes fabricated by atomic layer deposition (ALD). High-resolution X-ray photoelectron spectrometry (XPS) of O1s showed that the OH peak was significantly more pronounced in ALD samples than in single-crystal YSZ. Similarly, secondary ion mass spectrometry (SIMS) measurements, conducted for comparison on single-crystalline YSZ and atomic layer deposited YSZ, indicated that ALD YSZ contains 100 times higher deuterium concentration than single crystalline YSZ. SIMS depth profiles suggested diffusion of protons through protonic defects in YSZ. We have also fabricated fuel cells employing ALD YSZ with dense palladium layers to block oxygen but allow hydrogen transport. These performed as protonic fuel cells at intermediate temperatures achieving 10 mW/cm2 at 450 °C. These results open the possibility to engineer ALD YSZ as electrolyte membranes for new protonic devices operating at relatively low temperature regimes.

Original languageEnglish
Pages (from-to)5366-5370
Number of pages5
JournalChemistry of Materials
Volume22
Issue number18
DOIs
Publication statusPublished - 2010 Sep 28

ASJC Scopus subject areas

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

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