High-efficiency, nickel-ceramic composite anode current collector for micro-tubular solid oxide fuel cells
High-efficiency, nickel-ceramic composite anode current collector for micro-tubular solid oxide fuel cells
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DOI：
10.1016/j.jpowsour.2015.01.130
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发表时间：
2015-04
影响因子：
9.2
通讯作者：
Tao Li;Zhentao Wu;Kang Li
中科院分区：
文献类型：
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作者：
Tao Li;Zhentao Wu;Kang Li
高制造成本和低受流效率一直是阻碍微管式SOFC大规模应用的两大瓶颈。在这项工作中，开发了一种新型的镍基复合阳极集电器，用于阳极支撑的MT-SOFC，以解决降低成本、可制造性和集流效率的问题。通过相转化辅助共挤出工艺成功地制备了三层中空纤维，在此过程中，在内阳极表面均匀地涂覆了一层薄薄的镍基内层，以改善附着力，并具有良好的工艺经济性。内层加入10%的CGO，防止纯NiO过度收缩，从而实现共烧过程。电化学性能测试表明，集电层最薄的样品(阳极厚度的15%)具有最高的功率密度(1.07W/cm−2)。阻抗分析和理论计算表明，插入阳极集电体可以将接触损耗降低到总欧姆损耗的6-10%(文献报道为70%)，证明了新型集电体设计的高效性。此外，优越的可制造性和工艺经济性表明，这种复合集电器适合大规模生产。
High manufacturing cost and low-efficient current collection have been the two major bottlenecks that prevent micro-tubular SOFCs from large-scale application. In this work, a new nickel-based composite anode current collector has been developed for anode-supported MT-SOFC, addressing reduced cost, manufacturability and current collection efficiencies. Triple-layer hollow fibers have been successfully fabricated via a phase inversion-assisted co-extrusion process, during which a thin nickel-based inner layer was uniformly coated throughout the interior anode surface for improved adhesion with superior process economy. 10 wt.% CGO was added into the inner layer to prevent the excessive shrinkage of pure NiO, thus helping to achieve the co-sintering process. The electrochemical performance tests illustrate that samples with the thinnest anodic current collector (15% of the anode thickness) displayed the highest power density (1.07 W cm−2). The impedance analysis and theoretical calculations suggest that inserting the anodic current collector could dramatically reduce the percentage of contact loss down to 6–10 % of the total ohmic loss (compared to 70% as reported in literatures), which proves the high efficiencies of new current collector design. Moreover, the superior manufacturability and process economy suggest this composite current collector suitable for mass-scale production.