کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1295584 1498257 2016 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Determination of oxygen surface exchange constant of LaNi0.6Fe0.4O3−δ coated with Ce0.9Gd0.1O1.95 by isotope exchange technique
ترجمه فارسی عنوان
تعيين ثابت تبادل سطح اکسيژن LaNi0.6Fe0.4O3-δ با پوشش Ce0.9Gd0.1O1.95 با استفاده از روش تبادل ايزوتوپ
کلمات کلیدی
جنبش انتقال اکسیژن سطحی؛ تبادل ایزوتوپ؛ طیف سنجی جرمی یون ثانویه
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
چکیده انگلیسی


• The existence of GDC on the surface of bulk LNF was considered.
• The k* of LNF coated with GDC porous compared to bare LNF.
• The enhancement of k* is observed due to the existence of GDC.
• The reaction mechanism of the LNF coated with GDC porous is clarified.

The surface oxygen exchange coefficient (k*) of LaNi0.6Fe0.4O3−δ (LNF) coated with porous Ce0.9Gd0.1O1.95 (GDC) was determined by the isotope exchange technique. The LNF coated with GDC was subjected to isotope exchange treatment where 16O2 was abruptly changed into 18O2 at a range temperature of 873–1073 K under 10− 1 and 10− 2 bar of the oxygen partial pressure (p(O2)). The line-scanning mode of secondary ion mass spectrometry was used to determine the surface oxygen exchange of the LNF coated with GDC. The k* of LNF coated with GDC is enhanced compared to that of the bare LNF due to the formation of triple phase boundary between LNF, GDC, and gas phase of oxygen. The role of GDC is enhancing the incorporation process of the oxygen dissociated at the LNF surface. The adsorption and dissociation of oxygen takes place at LNF surface and incorporated into GDC porous.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 286, March 2016, Pages 19–23
نویسندگان
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