Ni-GDC阳极的制备及其孔隙率研究

采用缓冲溶液法制备出NiO—GDC复合粉末，该粉末压制、烧结后再经氰气气氛还原得到Ni—GDC金属陶瓷阳极。使用XRD，TEM，SEM对NiO—GDC和Ni—GDC的物相、形貌进行了观察分析，测定了阳极还原前后的相对密度、总孔隙率及开孔隙率。实验结果表明，由于NiO转变为Ni，有O的火上，使得还原后试样的相对密度明显下降，而孔隙率由15．4％提高到29．6％，且开孔隙率达到23．1％，可满足阳极作为燃料扩散通道的作用。多孔结构的Ni—GDC金属陶瓷阳檄有望成为中混固体氧化物燃料电池的阳极材料。

Preparation and Characterization of Porosity for the Ni-GDC Anode

The NiO-GDC composite powder was synthesized by the buffer solution method.After compaction,sintering,reduction with hydrogen,the Ni-GDC cermet was fabricated.The phase identification and morphology of the synthesized powder were measured by X-ray diffraction(XRD)and transmission electron microscope(TEM).The relative density,opening porosity and total porosity of the NiO-GDC anode before and after reduction were also determined.The results showed that because of losing of O after reduction,the relative density obviously decline and the porosity obviously increase from 15.4% to 29.6%.At the same time,the opening porosity reached at 23.1%.From the SEM micrograph,it showed that the porous Ni-GDC cermet was the potential porous anode material for IT-SOFC.