High-efficiency, nickel-ceramic composite anode current collector for micro-tubular solid oxide fuel cells

Tao Li, Zhentao Wu, K. Li*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Pages (from-to)446-452
Number of pages7
JournalJournal of Power Sources
Volume280
DOIs
Publication statusPublished - 15 Apr 2015

Keywords

  • Anodic current collector
  • Co-extrusion/co-sintering
  • Contact loss
  • Micro-tubular
  • SOFC

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