Crystal Structure and Transport Properties of Oxygen-Deficient Perovskite Sr0.9Y0.1CoO3-δ

Tianrang Yang; Victoria F. Mattick; Yan Chen; Ke An; Dong Ma; Kevin Huang

doi:10.1021/acsaem.7b00275

Crystal Structure and Transport Properties of Oxygen-Deficient Perovskite Sr_0.9Y_0.1CoO_3-δ

Tianrang Yang, Victoria F. Mattick, Yan Chen, Ke An, Dong Ma, Kevin Huang

Materials Engineering

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

The present work reports a systematic study on temperature-dependent local crystal structure, oxygen stoichiometry, and electrical/electrochemical properties of an oxygen-deficient Sr_0.9Y_0.1CoO_3-δ (SYC10) perovskite using variable-temperature neutron diffraction (VTND), thermal gravimetric analysis, and electrical/electrochemical methods, respectively. The VTND reveals that the crystal symmetry of SYC10 remains P4/mmm tetragonal up to 900 °C. The tetragonal symmetry reflects the net effects of temperature and oxygen stoichiometry on crystal symmetry. The observed p-type electronic conductivity behavior originates from the charge-ordering between the two distinctive Co-sites. The partial oxide-ion conductivity and diffusivity obtained from oxygen permeation measurements are 2.3 × 10^-2 S cm^-1 and 7.98 × 10^-8 cm²/s at 800 °C in air, respectively. The electrochemical oxygen reduction reaction kinetics of the SYC10 cathode is primarily limited by the charge-transfer process at low temperatures (600-650 °C) and oxide-ion migration from the cathode into the electrolyte at high temperatures (700-800 °C).

Original language	English
Pages (from-to)	822-832
Number of pages	11
Journal	ACS Applied Energy Materials
Volume	1
Issue number	2
DOIs	https://doi.org/10.1021/acsaem.7b00275
State	Published - Feb 26 2018

Funding

This work was funded by the Advanced Research Projects Agency-Energy (ARPA-E), U.S. Department of Energy, under Award No. DE-AR0000492; the Office of Fossil Energy, U.S. Department of Energy, under Award No. DE-FE-0023317; and the National Science Foundation, under Award No. CBET-1464112. Neutron scattering was carried out at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory, which is one of the user facilities sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S.

Keywords

charge-ordering
electronic conductivity
oxide-ion conductivity
oxygen stoichiometry
perovskite

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Access to Document

10.1021/acsaem.7b00275

Cite this

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title = "Crystal Structure and Transport Properties of Oxygen-Deficient Perovskite Sr0.9Y0.1CoO3-δ",

abstract = "The present work reports a systematic study on temperature-dependent local crystal structure, oxygen stoichiometry, and electrical/electrochemical properties of an oxygen-deficient Sr0.9Y0.1CoO3-δ (SYC10) perovskite using variable-temperature neutron diffraction (VTND), thermal gravimetric analysis, and electrical/electrochemical methods, respectively. The VTND reveals that the crystal symmetry of SYC10 remains P4/mmm tetragonal up to 900 °C. The tetragonal symmetry reflects the net effects of temperature and oxygen stoichiometry on crystal symmetry. The observed p-type electronic conductivity behavior originates from the charge-ordering between the two distinctive Co-sites. The partial oxide-ion conductivity and diffusivity obtained from oxygen permeation measurements are 2.3 × 10-2 S cm-1 and 7.98 × 10-8 cm2/s at 800 °C in air, respectively. The electrochemical oxygen reduction reaction kinetics of the SYC10 cathode is primarily limited by the charge-transfer process at low temperatures (600-650 °C) and oxide-ion migration from the cathode into the electrolyte at high temperatures (700-800 °C).",

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AU - An, Ke

AU - Ma, Dong

AU - Huang, Kevin

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