First observation of surface protonics on SrZrO3 perovskite under a H2 atmosphere

Yudai Hisai, Kota Murakami, Yukiko Kamite, Quanbao Ma, Einar Vøllestad, Ryo Manabe, Taku Matsuda, Shuhei Ogo, Truls Norby, Yasushi Sekine

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

This is the first direct observation that surface proton hopping occurs on SrZrO3 perovskite even under a H2 (i.e. dry) atmosphere. Understanding proton conduction mechanisms on ceramic surfaces under a H2 atmosphere is necessary to investigate the role of proton hopping on the surface of heterogeneous catalysts in an electric field. In this work, surface protonics was investigated using electrochemical impedance spectroscopy (EIS). To extract the surface proton conduction, two pellets of different relative densities were prepared: a porous sample (R.D. = 60%) and a dense sample (R.D. = 90%). Comparison of conductivities with and without H2 revealed that only the porous sample showed a decrease in the apparent activation energy of conductivity by supplying H2. H/D isotope exchange tests revealed that the surface proton is the dominant conductive species over the porous sample with H2 supply. Such identification of a dominant conductive carrier facilitates consideration of the role of surface protonics in chemical reactions.

Original languageEnglish
Pages (from-to)2699-2702
Number of pages4
JournalChemical Communications
Volume56
Issue number18
DOIs
Publication statusPublished - 2020 Mar 4

ASJC Scopus subject areas

  • Catalysis
  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Chemistry(all)
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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