کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
188903 459669 2012 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electrochemical behaviour of tungsten carbide-based materials as candidate anodes for solid oxide fuel cells
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Electrochemical behaviour of tungsten carbide-based materials as candidate anodes for solid oxide fuel cells
چکیده انگلیسی

Tungsten carbide-based electrodes under mixed hydrogen–methane and methane fuels have been investigated as potential anode materials for solid oxide fuel cell (SOFC) application. Firstly, it was shown that hydrogen is not a suitable fuel for the carbide-based materials. A conventional WC–YSZ composite and a carbide infiltrated porous YSZ support were then studied. Ac impedance spectroscopy revealed that the ohmic resistance and the charge-transfer polarization of these cells were reasonably low. The chemical reaction polarization, however, was relatively large, particularly under methane fuel. The carbide-based electrodes were then modified by incorporation of ceria and/or ruthenium. Not only did the co-existence of CeO2 and Ru synergically enhance the cell performance, more importantly it also greatly improved the stability of the polarized cell. Although bulk phase analysis confirmed the presence of a minor amount of tungsten oxide, surface analysis showed that the oxide phase remained superficial. It was then proposed that surface oxidation of the carbide phase was essentially a part of the fuel oxidation process and, as long as the rate of carbide oxidation and that of oxide recarburization remained comparable, the cell performance was stable.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 67, 15 April 2012, Pages 172–180
نویسندگان
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