微管式固体氧化物燃料电池阳极微结构及其性能  

Microstructure and Performance of Anode for Microtubular Solid Oxide Fuel Cells

作　　者：杨乃涛[1] 申义驰 延威[1] 孟秀霞[1] 谭小耀[2] 马紫峰[3] 

机构地区：[1]山东理工大学化工学院,淄博255049 [2]天津工业大学化工系,天津300387 [3]上海交通大学化工系,上海200240

出　　处：《无机材料学报》2014年第12期1246-1252,共7页Journal of Inorganic Materials

基　　金：国家自然科学基金(21376143);山东省自然科学基金(ZR2013BM010)~~

摘　　要：利用相转化纺丝法制备了Ni O-YSZ中空纤维,在其外表面负载YSZ膜1450℃共烧后形成YSZ/Ni O-YSZ双层中空纤维。阳极孔结构通过芯液(N-甲基砒咯烷酮(NMP)+乙醇)中溶剂NMP的含量来控制。当NMP含量从0、30wt%、50wt%、70wt%增加到100wt%时,阳极的孔结构由指状孔/海绵孔/指状孔三明治结构逐渐成为贯通的指状孔结构,电解质膜致密性、还原后的双层中空纤维的机械强度、阳极电导率逐渐减小,而孔隙率则增加。多孔的阴极Ag涂敷于致密的电解质膜外表面构成微管SOFC。H2/空气微管SOFC的浓差极化随着指状孔长度的增加而减小,当NMP含量为70wt%时,输出性能最佳,最大功率密度为662 m W/cm2(800℃),此时极化阻抗最小。NiO-YSZ hollow fibers were fabricated via a phase-inversion spinning technique. An YSZ electrolyte film was dip-coated on the outer surface of the fiber and then co-sintered at 1450℃ to form electrolyte/anode hol- low fiber half cell. The microstructure of the NiO-YSZ anode was modulated by controlling NMP/ethanol ratio of the inner coagulant during spinning process. Experimental results showed that, with the 1-Methy 1-2-Pyrrolidinone （NMP） content increase from 0 to 30wt%, 50wt%, 70wt% and 100wt%, the microscopy of the anode hollow fibers evolved from a sandwiched structure, i.e. finger-like pore/sponge voids/finger-like pore morphology, to a fin- ger-pore-penetrating structure, leading to porosity increase of the anode. Meanwhile, gas tightness of YSZ electrolyte film, mechanical strength of the reduced duaMayer hollow fibers, and conductivity of anode could decrease. Micro- tubular fuel cells were fabricated by coating a porous Ag cathode onto the dense YSZ electrolyte film. The concentra- tion polarization in the H2/air cell decreased with increasing the length of the finger-like pores. The microtubular SOFC made from the anode hollow fibers with 70wt% of NMP-ethanol as the inner coagulant demonstrated the mini- mum polarization resistance and the highest output performance with 662 mW/cm2 power density.

关 键 词：微管固体氧化物燃料电池 相转化法 阳极微结构 浓差极化 

分 类 号：O646[理学—物理化学] TQ174[理学—化学]