Ionic and Electronic Conductivities and Fuel Cell Performance of Oxygen Excess-Type Lanthanum Silicates
| Autor: | Yoshiki Ohnishi, Tetsuo Yazawa, Ryuta Sakamoto, Tomokazu Fukutsuka, Atsushi Mineshige, Yusuke Daiko, Hideki Yoshioka, Masafumi Kobune, Takayuki Nakao, Yoshiharu Uchimoto |
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| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Inorganic chemistry Ionic bonding chemistry.chemical_element Electrolyte Conductivity Condensed Matter Physics Cathode Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention Anode chemistry law Electrode Materials Chemistry Electrochemistry Lanthanum Ionic conductivity |
| Zdroj: | JOURNAL OF THE ELECTROCHEMICAL SOCIETY. 157(10):B1465-B1470 |
| ISSN: | 0013-4651 |
| Popis: | Highly dense pellets of an oxygen excess-type lanthanum silicate (La 9.333+x Si 6 O 26+1.5x , x > ca. 0.3, OE-LSO) were successfully fabricated, and their electrical conducting properties were studied. The replacement of Si by Al enhanced its conductivity, and the slightly Al-doped OE-LSO specimen [La 9.62 (Si 5.79 Al 0.21 )O 26.33 ] had excellent features as a solid electrolyte; that is, it had high ionic conductivity and was highly stable under reducing as well as oxidizing conditions at 873-1073 K. In addition, the ionic transference number was higher than 0.99. In the fuel cell utilizing this electrolyte (0.72 mm thick), (La 0.6 Sr 0.4 )(Co 0.2 Fe 0.8 )O 3―δ cathode, and Ni―Ce 0.9 Gd 0.1 O 1.95―δ anode, good performance with the maximum power density of ca. 0.25 W cm ―2 was obtained at 1073 K. In addition, this electrolyte also had high compatibility with these conventional mixed conducting electrodes, according to an analysis near the electrode/electrolyte interfaces after the fuel cell test. |
| Databáze: | OpenAIRE |
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