کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1461268 989617 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
TPR–TPD–TPO studies on CGO/NiO and CGO/CuO ceramics obtained from freeze-dried precursors
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
TPR–TPD–TPO studies on CGO/NiO and CGO/CuO ceramics obtained from freeze-dried precursors
چکیده انگلیسی

Nanocrystalline powders of Ce0.99Gd0.01O2−δ have been obtained at a very low temperature (400 °C) by a freeze-drying precursor method. Afterwards, ethanol solution of Ni or Cu nitrates were added to gadolinia doped ceria (CGO) by incipient wetness impregnation and then calcined in air at 650 °C in order to obtain CGO/NiO and CGO/CuO series of SOFC anode materials. The resulting materials were characterized by X-ray Diffraction, N2 adsorption–desorption (BET), Temperature Programmed Reduction (TPR), Temperature Programmed Desorption (TPD) and Temperature Programmed Oxidation (TPO) techniques. TPR showed wide overlapped peaks which are associated to the different reduction stages; firstly the reduction of highly dispersed metal oxide species took place and then the metal oxide bulk reduction process. After reduction of the CGO-metal powders, the metallic oxides were no longer present (as indicated by the presence of Ni or Cu), and the fluorite CGO solid solution remained stable. He-TPD tests showed that the series CGO/NiO adsorbed CO species on the material surface while CGO/CuO did not. O2-TPO analysis showed that C deposition occurred during the CO-TPR on CGO/NiO samples but this did not occur for the CGO/CuO series.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 40, Issue 9, Part B, November 2014, Pages 15175–15182
نویسندگان
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