Introduction: The direct use of CH4 as the feed to the solid oxide fuel cell (SOFC) will allow elimination of a reformer, simplifying the SOFC system and decreasing the system cost [1]. The overall reaction on the anode catalyst in the direct CH4 SOFC is the electrochemical oxidation of CH4: CH4 + 4O CO2 + 2H2O + 8e. Due to the nature of hydrocarbon reactions at high temperature and the reducin...

Unraveling structural dynamics of noble metal nanoclusters on oxide supports is critical to understanding reaction process and origin of catalytic activity in heterogeneous catalysts. Here, we show that aberration-corrected scanning transmission electron microscopy can provide direct atomic-resolution imaging of surface migration, coalescence, and atomic rearrangement of Au clusters on an Y:ZrO...

• The kinetics of CH4 steam reforming and partial oxidation are determined by the oxidation rate of CHx adsorbed species • The modification of the Ni/YSZ and Ni/GDC with Au and/or Au-Mo results in differentiated structures of atomically dispersed Au and/or Au-Mo at the surface and the bulk of the Ni particles. • At lean S/C NiAu/YSZ selectively oxidizes electrochemically the catalytically produ...

Micro-patterned Ni thin films with well-defined 2D-structures are useful to examine electrochemical reaction kinetics of SOFC anodes. In this work, an electrode preparation method is developed yielding stable Ni pattern electrodes on YSZ, which facilitate long term measurements. Moreover, these stable electrodes allowed investigating the effect of the YSZ substrate orientation on the polarizati...

In this work, thin film yttria-stabilized zirconia [YSZ] solid electrolytes were sputtered onto insulating substrates at room temperature and 600oC in order to produce different average grain sizes (~15-50 nm). For reference, polished samples of single crystal and bulk, poly-crystalline YSZ were also used. Platinum film electrodes were then sputtered on top and lithographically patterned to giv...

در این مقاله پس از فرمول­بندی و ساخت لایه­های ضخیم ysz8  و ysz8-ni5/1 توسط روش چاپ سیلک روی زیرپایه آلومینایی، مقدار بندگپ در اثر افزودن اکسید نیکل با نمونه بدون دوپنت و همچنین حساسیت این حسگرها نسبت به بخار اتانول مورد بررسی و مقایسه قرار گرفت. از اهداف این پژوهش بررسی و مقایسه مقدار بندگپ، انرژی فعالسازی، تغییرات حساسیت، زمان پاسخ و بازیابی می­باشد. نتایج نشان می­دهد که نمونه بدون دوپنت نسبت ...

In the present work, surface characterization of YSZ/Al2O3 /CeO2 plasma sprayed coatings was performed to understand characteristics. The content Yttria-stabilized zirconia (YSZ) 60 wt.% , where alumina varied from 30 38 and CeO2 2 10 wt.%, respectively. Ceramic with a different percentage variation composite materials were used increase layer strength on substrate SS-304. SEM micrographs analy...