NI/NI-YSZ current collector/anode dual layer hollow fibers for micro-tubular solid oxide fuel cells

K. Kanawka, M. H.D. Othman, N. Droushiotis, Z. Wu, G. Kelsall, K. Li*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


A co-extrusion technique was employed to fabricate a novel dual layer NiO/NiO-YSZ hollow fiber (HF) precursor which was then co-sintered at 1,400°C and reduced at 700°C to form, respectively, a meshed porous inner Ni current collector and outer Ni-YSZ anode layers for SOFC applications. The inner thin and highly porous "mesh-like" pure Ni layer of approximately 50 μm in thickness functions as a current collector in micro-tubular solid oxide fuel cell (SOFC), aiming at highly efficient current collection with low fuel diffusion resistance, while the thicker outer Ni-YSZ layer of 260 μm acts as an anode, providing also major mechanical strength to the dual-layer HF. Achieved morphology consisted of short finger-like voids originating from the inner lumen of the HF, and a sponge-like structure filling most of the Ni-YSZ anode layer, which is considered to be suitable macrostructure for anode SOFC system. The electrical conductivity of the meshed porous inner Ni layer is measured to be 77.5 × 105Sm -1. This result is significantly higher than previous reported results on single layer Ni-YSZ HFs, which performs not only as a catalyst for the oxidation reaction, but also as a current collector. These results highlight the advantages of this novel dual-layer HF design as a new and highly efficient way of collecting current from the lumen of micro-tubular SOFC.

Original languageEnglish
Pages (from-to)690-696
Number of pages7
JournalFuel Cells
Issue number5
Publication statusPublished - 1 Oct 2011


  • Co-extrusion
  • Current Collector
  • Dual Layer
  • Hollow Fiber
  • SOFC


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