Co-extruded dual-layer hollow fiber with different electrolyte structure for a high temperature micro-tubular solid oxide fuel cell
Co-extruded dual-layer hollow fiber with different electrolyte structure for a high temperature micro-tubular solid oxide fuel cell
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DOI：
10.1016/j.ijhydene.2016.06.044
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发表时间：
2017-04-06
影响因子：
7.2
通讯作者：
Ismail, Ahmad Fauzi
中科院分区：
文献类型：
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作者：
Ahmad, Siti Halimah;Jamil, Siti Munira;Ismail, Ahmad Fauzi
本研究采用相转化共挤法制备了结构改善的电解液/阳极双层中空纤维(HF)前驱体，并在1450℃下进行共烧，通过改变悬浮制备过程中不同粒径(微米、亚微米和纳米)的电解液材料(即氧化钇稳定的氧化锆，YSZ)的负载量，对电解液结构进行了深入的研究。结果表明，将70%的亚微米YSZ和30%的纳米YSZ混合在电解液悬浮液中(E-0.7~0.3纳米)，可获得薄、致密、气密、无缺陷的电解层。这种电解液配方与厚厚的镍-氧化物-YSZ(NiO-YSZ)阳极层共挤压，产生了最高的弯曲强度，达到85兆帕，为HF提供了主要的机械强度。此外，在2.87×10(-6)molm(-2)S-1pa-1处的氮渗透率值表明，电解液是气密的，阻止了燃料和氧化剂的运输。然后将纤维还原为镍(Ni)金属陶瓷阳极。通过在双层Hf上电刷涂覆La-锶-钴铁氧体(LSCF)/YSZ阴极，研制成一种完整的微管式固体氧化物燃料电池(MT-SOFC)。电池充入氢气后，在875℃下产生了高达1.06V的开路电压，最大功率密度为0.243 W cm(2)。在此基础上，发现采用混合颗粒尺寸的电解液结构修饰的双层中空纤维基MT-SOFC可能会产生一种很有前途的开路电压。然而，相对较低的功率密度值可能是由于阳极的多孔性较少；因此，在未来的研究中需要改进阳极的结构。(C)2016年氢能源出版有限责任公司。爱思唯尔有限公司出版。保留所有权利。
In this study, the phase inversion-based co-extrusion method was employed to fabricate a structural-improved electrolyte/anode dual-layer hollow fiber (HF) precursor, which was then co-sintered at 1450 degrees C. The electrolyte structures were thoroughly investigated by varying the loading of electrolyte material (i.e. Yttria-stabilized zirconia, YSZ) with differing particle sizes (i.e. micron, sub-micron, and nano-sized) during suspension preparation. The results showed that the most promising electrolyte layer with thin, dense, gastight, and defect-free properties was obtained by mixing 70% submicron-YSZ and 30% nano-YSZ in electrolyte suspension (E-0.7sub0.3nano). This electrolyte formulation co-extruded with a thick nickel-oxide-YSZ (NiO-YSZ) anode layer yielded the highest bending strength of 85 MPa, providing major mechanical strength to the HF. Besides that, the nitrogen permeability value at 2.87 x 10(-6) mol m(-2) S-1 Pa-1 suggested that the electrolyte was gas-tight, preventing fuel and oxidant transport. The fiber was then reduced to nickel (Ni)-cermet anode. It was developed to be a complete micro-tubular solid oxide fuel cell (MT-SOFC) by depositing the lanthanum strontium cobalt ferrite (LSCF)/YSZ cathode via brush painting on the dual-layer HF. The cell was fed with hydrogen gas and yielded an open-circuit voltage (OCV) as high as 1.06 V with maximum power density of 0.243 W cm(2), at 875 degrees C. Based on this test, it was found that the electrolyte structural-modified dual-layer hollow fiber-based MT-SOFC using mixed particle sizes may result in a promising OCV. However, the relatively low value for power density may be due to a less porous anode; thus, improvements in the anode's structure are required in future research. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.