Platinum nanoparticle induced nanoionic effects on electrical conduction in strontium cerate and zirconate

  • Yasuhiro TakamuraEmail author
  • Kwati Leonard
  • Aileen Luo
  • Lane W. Martin
  • Hiroshige Matsumoto
Original Paper


Heterointerfaces introduce unique localized defects into ionic conductors. This study explores the nanoionic characteristics exhibited by the proton-conducting oxides SrZr0.9Y0.1O3-δ and SrCe0.95Yb0.05O3-δ including finely dispersed precipitated platinum nanoparticles. The electrical conductivity of both the platinum-doped oxides revealed reversible nanoionic phenomena caused by the exsolution of the platinum in the form of platinum nanoparticles, at 0.5 vol% relative to the metal oxides, and dissolution in response to a change in gas atmosphere. In comparison with the original conductivity of SrZr0.9Y0.1O3-δ and SrCe0.95Yb0.05O3-δ, the conductivity of platinum-doped SrZr0.9Y0.1O3-δ decreased significantly in a wet hydrogen atmosphere, whereas platinum-doped SrCe0.95Yb0.05O3-δ showed almost no decrease in conductivity in the same atmosphere. The different responses of the two materials to the change in gas atmosphere are discussed in relation to the precipitation of platinum nanoparticles.


Proton conductor Nanoionics Platinum nanoparticle exsolution Heterointerfaces Transport number Work function 



This study was supported by World Premium International Research Center Initiative (WPI), MEXT, Japan and the Kyushu University Platform of Inter/Transdisciplinary Energy Research (Q-PIT), JSPS Core-to-Core Program, A. Advanced Research Networks, Partnerships for International Research and Education (PIRE) and A.L. and L.W.M. acknowledge support from the National Science Foundation under grant OISE-1545907. Dr. E. Kaveh of Kyushu University (WPI-I2CNER) is acknowledged for the measurement of TEM image of Pt-SCYb.

Supplementary material

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Hydrogen Energy SystemKyushu UniversityFukuokaJapan
  2. 2.International Institute for Carbon-Neutral Energy Research (WPI-I2CNER)Kyushu UniversityFukuokaJapan
  3. 3.Department of Materials Science and EngineeringUniversity of CaliforniaBerkeleyUSA
  4. 4.Materials Sciences DivisionLawrence Berkeley National LaboratoryBerkeleyUSA

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