Platinum nanoparticle induced nanoionic effects on electrical conduction in strontium cerate and zirconate
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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.
KeywordsProton 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.
- 21.Matsumoto H, Tanji T, Amezawa K, Kawada T, Uchimoto Y, Furuya Y, Sakai T, Matsuka M, Ishihara T (2011) Nanoprotonics in perovsikte-type oxides: reversible changes in color and ion conductivity due to nanoionics phenomenon in platinum-containing perovskite oxide. Solid State Ionics 182(1):13–18CrossRefGoogle Scholar
- 26.Lee YS, Leonard K, Okuyama Y, Matsumoto H The effect of transition metal doping on the electrical properties of perovskite type proton conductors: (1) alkaline earth cerates. Submitt to Solid State IonicsGoogle Scholar