Effects of Pt dispersion on electronic and oxide ionic conductivity in Pr1.90Ni0.71Cu0.24Ga0.05O4

T. Ishihara; J. Hyodo; H. Schraknepper; K. Tominaga; S. Ida

doi:10.1039/C5CP07192E

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Effects of Pt dispersion on electronic and oxide ionic conductivity in Pr_1.90Ni_0.71Cu_0.24Ga_0.05O₄†

T. Ishihara,*^ab J. Hyodo,^a H. Schraknepper,^a K. Tominaga^a and S. Ida^ab

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* Corresponding authors

^a Department of Applied Chemistry, Faculty of Engineering, Kyushu University, Motooka 744, Nishi-ku, Fukuoka, Japan
E-mail: ishihara@cstf.kyushu-u.ac.jp

^b International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, Motooka 744, Nishi-ku, Fukuoka, Japan

Abstract

The effects of dispersing Pt particles in bulk Pr_1.90Ni_0.71Cu_0.21Ga_0.05O_4+δ (PNCG) on the electrical conductivity and oxygen permeability of the material were studied. The different thermal expansion coefficients of PNCG and Pt generated a mechanical compressive strain in the PNCG. This may cause the electrical conductivity to decrease in samples containing Pt. In contrast, the oxide ion conductivity estimated from the oxygen permeability increased upon dispersion of Pt. These variations appear to be related to the electron hole and interstitial oxygen concentrations. Moreover, the present study suggests that the mechanical strain induces a chemical strain via the introduction of oxygen defects as well as changes in cation valences.

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Article information

DOI: https://doi.org/10.1039/C5CP07192E
Article type: Paper
Submitted: 22 Nov 2015
Accepted: 22 Mar 2016
First published: 22 Mar 2016

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Phys. Chem. Chem. Phys., 2016,18, 11125-11131

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Effects of Pt dispersion on electronic and oxide ionic conductivity in Pr_1.90Ni_0.71Cu_0.24Ga_0.05O₄

T. Ishihara, J. Hyodo, H. Schraknepper, K. Tominaga and S. Ida, Phys. Chem. Chem. Phys., 2016, 18, 11125 DOI: 10.1039/C5CP07192E

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