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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.

参考文献

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