کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9610383 47183 2005 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis and oxygen transport characteristics of dense and porous cerium/gadolinium oxide materials
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Synthesis and oxygen transport characteristics of dense and porous cerium/gadolinium oxide materials
چکیده انگلیسی
Cerium/gadolinium oxide (CGO)-based ceramic ion conductive membranes (CICMs) have potential uses in catalytic membrane reactors (CMRs) and solid oxide fuel cells (SOFCs). A supercritical CO2 aided sol-gel process allowed the synthesis of CGO materials with the composition Ce0.9Gd0.1O1.95. The produced nanophase powders were non-agglomerated, with a controlled morphology, a high purity and a high specific surface area (>100 m2/g). The CGO cubic crystalline phase has been obtained at temperatures <300 °C, lower than those of conventional solid state chemistry routes. With respect to ionic oxygen transport, a high conductivity at intermediate temperature (2 × 10−2 S cm−1 at 600 °C), almost equivalent in dense and porous samples, has been obtained on sintered materials prepared from these powders. In relation to their porosity characteristics, a modelling approach successfully explained the high ionic oxygen transport of some specific porous samples. Future directions for preparing porous conductive ceramics well adapted to CMR or SOFC applications can be anticipated from this model.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Catalysis Today - Volume 104, Issues 2–4, 30 June 2005, Pages 120-125
نویسندگان
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