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Preparation of ultra-fine Sm0.2Ce0.8O1.9 powder by a novel solid state reaction and fabrication of dense Sm0.2Ce0.8O1.9 electrolyte film
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| 【文章作者】Zhao, B.;Tong, Y.;Zhao, Y.;Yang, T.;Yang, F.;Hu, Q.;Zhao, C. |
| 【文章摘要】 A novel solid state reaction was adopted to prepare Sm0.2Ce0.8O1.9 (SDC) powder. A mixed oxalate Sm0.2Ce0.8(C2O4)(1.5)center dot 2H(2)O was synthesized by milling a mixture of cerium acetate hydrate, samarium acetate hydrate, and oxalic acid for 5 h at room temperature. An ultra-fine SDC powder with the primary particle size of 5.5 nm was obtained at 300 degrees C. The ultra-low temperature for the formation of SDC phase was due to the atomic level mixture of the Sm3+ and Ce4+ ions. The crystal sizes of SDC powders at 300 degrees C, 550 degrees C, 800 degrees C, and 1050 degrees C were 5.5 nm, 11.4 nm, 24.1 nm and 37.5 nm, respectively. The sintering curves showed that the powder calcined at lower temperature was easier to be sintered owning to its smaller particle size. A solid oxide electrolytic cell (SOEC), comprising porous La0.8Sr0.2Cu0.1Fe0.9O3-delta (LSCF) for substrate, LSCF-SDC for active electrode, SDC for electrolyte, and LSCF SDC for symmetric electrode, was fabricated by dip-coating and co-sintering techniques. An extremely dense SDC film with the thickness of 20 mu m was obtained at only 1200 degrees C, which was about 100-300 degrees C lower than the literatures' reports. The designed SOEC was proved to work effectively for decomposing NO (3500 ppm, balanced in N-2), 80% NO can be decomposed at 600 degrees C. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved. |
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【卷】41 【ISSUE】8 【ISSUEID】815C0073
【文章期份】2015
【发布日期】2016/1/20 0:00:00
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