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*

*この研究の対応する著者

研究成果: Article査読

6 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)2699-2702
ページ数4
ジャーナルChemical Communications
56
18
DOI
出版ステータスPublished - 2020 3 4

ASJC Scopus subject areas

  • 触媒
  • 電子材料、光学材料、および磁性材料
  • セラミックおよび複合材料
  • 化学 (全般)
  • 表面、皮膜および薄膜
  • 金属および合金
  • 材料化学

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