Ru-doped lanthanum strontium titanates for the anode of solid oxide fuel cells
| Autor: | Jing Zou, Nigel M. Sammes, Heechul Yoon, Jong-Shik Chung |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Reducing atmosphere Inorganic chemistry Oxide Energy Engineering and Power Technology chemistry.chemical_element Condensed Matter Physics Anode chemistry.chemical_compound Fuel Technology chemistry Lanthanum Strontium titanate Ionic conductivity Solid oxide fuel cell Perovskite (structure) |
| Zdroj: | International Journal of Hydrogen Energy. 40:10985-10993 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2015.05.193 |
| Popis: | Lanthanum strontium titanate perovskite (LST) was doped with Ru (La 0.4 Sr 0.6 Ti 1−x Ru x O 3−δ (LSTR), x = 0.02, 0.05), and its properties were characterized by various methods for possible use as the anode material in solid oxide fuel cells (SOFCs). The thermal expansion coefficients of Ru-doped samples (10.2–10.3 × 10 −6 K −1 ) are about the same as LST (10.4 × 10 −6 K −1 ), which is similar to that of YSZ. It has been found that under a reducing atmosphere, doped Ru is precipitated from the structure. This decreases the total electrical conductivity and increases the ionic conductivity because of the increased number of B-site deficiencies created by the Ru precipitation. Impedance spectra measured with the buttons cells of the LSTRs-YSZ/YSZ/LSM-YSZ/LSM configuration reveal that the polarization resistance with the LST–YSZ anode increases with time (from 4.95 Ω cm 2 to 5.78 Ω cm 2 in 24 h of H 2 fuel atmosphere), whereas the resistance with Ru-doped LST–YSZ anodes decreases with time (from 4.87 Ω cm 2 and 4.17 Ω cm 2 to 4.06 Ω cm 2 and 2.74 Ω cm 2 for the LSTR0.02-YSZ and LSTR0.05-YSZ anodes, respectively). Accordingly, the final maximum power density at 850 °C also increases from 52 mW/cm 2 for LST–YSZ to 74 mW/cm 2 and 115 mW/cm 2 for the LSTR0.02-YSZ and LSTR0.05-YSZ anodes, respectively. |
| Databáze: | OpenAIRE |
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