YSZ/Ni-YSZ双层中空纤维电解质层厚度控制及其影响  

Electrolyte Thickness Control and Its Effect on YSZ/Ni-YSZ Dual-layer Hollow Fibres

作　　者：宫勋[1] 孟秀霞[1,2] 杨乃涛[1] 谭小耀[1,3] 尹屹梅[2] 马紫峰[2] 

机构地区：[1]山东理工大学化工学院,淄博255049 [2]上海交通大学化学工程系,上海200240 [3]天津工业大学化学工程系,天津300160

出　　处：《无机材料学报》2013年第10期1108-1114,共7页Journal of Inorganic Materials

基　　金：国家自然科学基金(21176187;21076118;21173147);山东省优秀中青年科学家科研奖励基金(2010BSB01011)~~

摘　　要：本研究利用相转化共纺丝法一步制备出微管式固体氧化物燃料电池(MT-SOFC)用电解质/阳极(YSZ/NiO-YSZ)双层中空纤维膜,将制得的YSZ/NiO-YSZ双层中空纤维膜前驱体经1450℃烧结后,以纯H2在700℃下还原4 h得到YSZ/Ni-YSZ双层中空纤维膜。电解质YSZ膜层厚度通过改变YSZ铸膜液挤出速率来调节。将La0.8Sr0.2MnO3-δ(LSM)阴极乳浆浸渍涂覆在烧结后的YSZ/NiO-YSZ双层中空纤维膜外,经1200℃烧结后形成微管式固体氧化物燃料电池。结果表明,当阳极铸膜液以10 mL/min速率挤出,而电解质铸膜液挤出速率为0.5、1、1.5、2 mL/min时,构造的YSZ/Ni-YSZ双层中空纤维膜电解质层厚度分别为6、13、18、28μm,其机械强度、气密性均随着电解质层厚度增加而增大,但电导率与孔隙率受电解质层厚度的影响较小。YSZ膜厚度为28μm的MT-SOFC,800℃时以20 mL/min氢气作为燃料,30 mL/min空气作为氧化剂,最大开路电压为1.01 V,最大输出功率只有75 mW/cm2。但同样测试条件下,YSZ膜厚度为6μm的MT-SOFC,开路电压为0.92 V,最大输出功率升至329 mW/cm2。Electrolyte/anode （YSZ/NiO-YSZ） dual-layer hollow fibres were developed by a co-spinning process based on phase inversion technique for fabrication of micro tubular solid oxide fuel cells （MT-SOFCs）. After being calcined at 1450 ℃ in ambient air and reduced at 700 ℃ in H2 for 4 h, the precursors were transformed into dual layer YSZ/Ni-YSZ hollow fibers. Full MT-SOFCs were fabricated by dip-coating with La0.sSr0.2MnO3 （LSM） ink on the outer surface of YSZ/NiO-YSZ dual layer hollow fibers and sintering at 1200 ℃. The results show that the YSZ membranes of the dual-layer hollow fibers possess thicknesses of 6, 13, 18 and 28 μm when the spinning rates of electrolyte dopes are 0.5, 1, 1.5 and 2 mL/min and the anode dope keeps on a constant rate of 10 mL/min. The bending strength and the gas-tightness of the dual-layer hollow fibers increase with the increase of electrolyte thickness. However, the electrical conductivity and porosity of the dual-layer hollow fibers are less influenced by YSZ thickness. The maximum power density of single MT-SOFC with an electrolyte layer of 28 μm is 75 mW/cm2, while the output of an MT-SOFC with a 6 μm-thick YSZ membrane is up to 329 mW/cm2, both operated at 800 ℃ using 20 mL/min H2 as fuel and 30 mL/min air as oxidant.

关 键 词：双层中空纤维 YSZ电解质膜 相转化法 微管式固体氧化物燃料电池 共纺丝-共烧结 

分 类 号：TQ174[化学工程—陶瓷工业]