【摘要】 流延法制备了SOFC NiO/YSZ阳极,比较了NiO(微米级)和NiO(纳米级)两种NiO,发现由NiO(纳米级)制备的电池在800℃最大放电功率密度257.1mW/cm2,而由NiO(微米级)制备的电池相同条件下仅为124.9mW/cm2,原因在于NiO(纳米级)粒径小,制备的阳极三相反应区大。NiO(纳米级)经700℃煅烧后制备的电池最大功率密度增加到369.0mW/cm2,而800℃和900℃煅烧时减少到169.5和159.0mW/cm2,因为700℃煅烧增加了NiO的活性,而800和900℃煅烧的NiO粒径增大到1.35μm,制备的阳极减小了反应活性区。YSZ在1200℃煅烧后,粒径从0.2μm增加到34μm,由于YSZ粒径远大于NiO,导致NiO之间接触不良,制备的电池性能下降到120.0mW/cm2,继续球磨12h后,YSZ粒径减小到0.70μm,NiO和YSZ之间分布均匀,制备的电池放电功率密度提高到447.9mW/cm2。更多还原

【Abstract】 NiO-μm and NiO-nm in SOFC anodes,which were prepared by tape casting,were compared.It was found that,the maximum power density of the cell with NiO-nm as anode was 257.1mW/cm2 at 800℃,but that was only 124.9mW/cm2 for NiO-μm.The reason was that the anode with NiO-nm has larger trible phase boundary.After calcining at 700℃ for NiO-nm,the power density increased to 369.0mW/cm2,while it deceased to 169.5 and 159.0mW/cm2 at 800 and 900℃ respectively,because NiO calcined at 700℃ improved its activity and held its small particle size,but the particle increased abruptly up to 1.35μm at 800 and 900℃.When YSZ in the anodes calcined at 1200℃,the particle size increased from 0.2-34μm,the maximum power density of the cell decreased to 120.0mW/cm2,because NiO was isolated by large YSZ.However,these YSZ were milled for 12h,the particle size decreased to 0.70μm and the power density increased to 447.9mW/cm2 because of YSZ and NiO distributed uniformity.更多还原