کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7745022 | 1498255 | 2016 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Structural, electrical and electrochemical properties of calcium-doped lanthanum nickelate
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The present work focuses on the structural, thermo-mechanical and electrical properties of La2-xCaxNiO4 + δ with different calcium content (x = 0-0.4) and the electrochemical performance of the electrodes on their base in contact with a Ce0.8Sm0.2O1.9 electrolyte. It was shown that the introduction of even a small amount of calcium (x = 0.1) stabilized the crystal structure in the tetragonal syngony across the whole temperature range 25-800 °C. Dilatometric study of the compact samples in the entire concentration range of Ca showed no phase transitions up to 800 °C. The total electrical conductivity, measured by a dc four-probe technique, increased with an increase in calcium content. However, electrochemical activity of the La2-xCaxNiO4 + δ - based electrodes, contrarily, drastically decreased. The polarization resistance Rη, derived from the impedance spectroscopy data, increased from 0.18 Ω·cm2 (x = 0) to 1.24 Ω·cm2 (x = 0.3) at 800 °C. The coefficients of oxygen surface exchange (kâ) and oxygen tracer diffusion (Dâ) calculated from the oxygen isotope exchange data for La2NiO4 + δ were considerably higher than those for La1.7Ca0.3NiO4 + δ (4.54 â 10â 7 cm â sâ 1 and 3.02·10â 8 cm2 â sâ 1 (x = 0); 2.91 â 10â 8 cm â sâ 1 and 5.82·10â 10 cm2 â sâ 1 (x = 0.3) at 800 °C, respectively). It was found that for La1.7Ca0.3NiO4 + δ the rate-determining stage of oxygen surface exchange is incorporation of oxygen, while for La2NiO4 + δ it is oxygen dissociative adsorption.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 288, May 2016, Pages 48-53
Journal: Solid State Ionics - Volume 288, May 2016, Pages 48-53
نویسندگان
A.Ð. Kolchugin, E.Yu. Pikalova, N.M. Bogdanovich, D.I. Bronin, S.M. Pikalov, S.V. Plaksin, M.V. Ananyev, V.A. Eremin,