摘要
固体氧化物燃料电池在使用中存在还原过程,微观形貌会发生变形.将半电池试样在管式炉中进行还原反应,通过SEM观察其微观形貌反应前后的变化,利用能谱测定反应前后的元素原子比重.研究结果表明:电解质氧化钇稳定氧化锆(YSZ)薄膜表面形貌还原前后变化不大,表面平整光滑;截面形貌变化明显,还原后变为融合状态.阳极支撑NiO/YSZ截面颜色变化明显,还原后变为灰色的Ni/YSZ.YSZ陶瓷小颗粒状的出现,表面突出不平整,有明显的断裂解理台阶,层片状的NiO,表面光滑平整.还原反应使NiO相变成Ni相,不再与YSZ包覆在一起,独立的Ni相增多.
This paper was conducted to study the morpnoafter reduction. The specimens of half-cell were put in a tube furnace during reduction. The changes of the half-cell morphology were observed by means of SEM before and after reaction. Determination of the atomic proportions of the elements in half-cell before and after reduction is to quantify the oxide degree. It shows that the change of smooth surface morphology in the YSZ electrolyte surface before and after reduction is little, while the morphology of its cross section turns into fusion state after reduction from block state before reduction. The color of anode supported layer of NiO/YSZ changes from oxidation state of green NiO/YSZ into reduction state of gray Ni/YSZ. YSZ ceramic in the anode supported layer is granular and shiny. Its surface is uneven and the fracture step is obvious. The NiO in the anode supported layer is gray and sheet. Its surface is smooth. Reduction makes NiO phase, which is no longer coated with the YSZ, change into Ni phase. The Ni phase in half-cell is independent and increasing.
出处
《西安工业大学学报》
CAS
2012年第10期840-843,共4页
Journal of Xi’an Technological University
基金
国家自然科学基金(10772146)
西安工业大学校长科研基金项目(XAGDXJJ1121)
