Crystal Structure and Transport Properties of Oxygen-Deficient Perovskite Sr0.9Y0.1CoO3−δ
| Autor: | Yan Chen, Dong Ma, Ke An, Tianrang Yang, Kevin Huang, Victoria F. Mattick |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Neutron diffraction Analytical chemistry Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology Crystal structure Conductivity 010402 general chemistry 021001 nanoscience & nanotechnology Thermal diffusivity 01 natural sciences Oxygen 0104 chemical sciences Tetragonal crystal system Charge ordering chemistry Materials Chemistry Electrochemistry Chemical Engineering (miscellaneous) Electrical and Electronic Engineering 0210 nano-technology Perovskite (structure) |
| Zdroj: | ACS Applied Energy Materials. 1:822-832 |
| ISSN: | 2574-0962 |
| DOI: | 10.1021/acsaem.7b00275 |
| Popis: | 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... |
| Databáze: | OpenAIRE |
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