Dual-layer hollow fibres with different anode structures for micro-tubular solid oxide fuel cells

Mohd Hafiz Dzarfan Othman, Nicolas Droushiotis, Zhentao Wu, Geoff Kelsall, K. Li*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

In this study, a high performance micro-tubular solid oxide fuel cell (SOFC) has been developed by depositing a multi-layer cathode onto an improved electrolyte/anode dual-layer hollow fibre fabricated via a single-step co-extrusion/co-sintering technique. The use of 0-20 wt.% of ethanol in the inner layer spinning suspension allows the control over the asymmetric structure of the Ni-CGO anode layer, i.e. finger-like voids structure covering about 50-85% of the anode layer thickness with the rest volume occupied by sponge-like structure, and at the same time affects the morphology of the CGO electrolyte layer. The presence of finger-like voids significantly facilitates the fuel gas diffusion inside the anode, and as a result, the maximum power density increases from 1.84 W m -2 to 2.32 W cm -2, when the finger-like voids is increased from 50% to 70% of the asymmetric anode layer. However, further growth of finger-like voids, i.e. 85% of the anode layer, dramatically reduce the number of triple-phase boundary (TPB) region and conductivity in the anode, as well as the gas-tightness property of the electrolyte, which consequently decreases the maximum power density to 0.99 W cm -2. Based on the results obtained, therefore, dual-layer hollow fibres with 50-70% of finger-like voids in the anode layer can be considered as the ideal structure for producing high performance micro-tubular SOFCs.

Original languageEnglish
Pages (from-to)272-280
Number of pages9
JournalJournal of Power Sources
Volume205
DOIs
Publication statusPublished - 1 May 2012

Fingerprint

solid oxide fuel cells
Solid oxide fuel cells (SOFC)
hollow
Anodes
anodes
fibers
Fibers
voids
Electrolytes
electrolytes
radiant flux density
Diffusion in gases
Gas fuels
tightness
Phase boundaries
gaseous diffusion
Extrusion
Suspensions
Cathodes
Ethanol

Keywords

  • Asymmetric structure
  • Co-extrusion
  • Dual-layer hollow fibre
  • Finger-like voids
  • Micro-tubular SOFC

Cite this

Othman, M. H. D., Droushiotis, N., Wu, Z., Kelsall, G., & Li, K. (2012). Dual-layer hollow fibres with different anode structures for micro-tubular solid oxide fuel cells. Journal of Power Sources, 205, 272-280. https://doi.org/10.1016/j.jpowsour.2012.01.002
Othman, Mohd Hafiz Dzarfan ; Droushiotis, Nicolas ; Wu, Zhentao ; Kelsall, Geoff ; Li, K. / Dual-layer hollow fibres with different anode structures for micro-tubular solid oxide fuel cells. In: Journal of Power Sources. 2012 ; Vol. 205. pp. 272-280.
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abstract = "In this study, a high performance micro-tubular solid oxide fuel cell (SOFC) has been developed by depositing a multi-layer cathode onto an improved electrolyte/anode dual-layer hollow fibre fabricated via a single-step co-extrusion/co-sintering technique. The use of 0-20 wt.{\%} of ethanol in the inner layer spinning suspension allows the control over the asymmetric structure of the Ni-CGO anode layer, i.e. finger-like voids structure covering about 50-85{\%} of the anode layer thickness with the rest volume occupied by sponge-like structure, and at the same time affects the morphology of the CGO electrolyte layer. The presence of finger-like voids significantly facilitates the fuel gas diffusion inside the anode, and as a result, the maximum power density increases from 1.84 W m -2 to 2.32 W cm -2, when the finger-like voids is increased from 50{\%} to 70{\%} of the asymmetric anode layer. However, further growth of finger-like voids, i.e. 85{\%} of the anode layer, dramatically reduce the number of triple-phase boundary (TPB) region and conductivity in the anode, as well as the gas-tightness property of the electrolyte, which consequently decreases the maximum power density to 0.99 W cm -2. Based on the results obtained, therefore, dual-layer hollow fibres with 50-70{\%} of finger-like voids in the anode layer can be considered as the ideal structure for producing high performance micro-tubular SOFCs.",
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Othman, MHD, Droushiotis, N, Wu, Z, Kelsall, G & Li, K 2012, 'Dual-layer hollow fibres with different anode structures for micro-tubular solid oxide fuel cells', Journal of Power Sources, vol. 205, pp. 272-280. https://doi.org/10.1016/j.jpowsour.2012.01.002

Dual-layer hollow fibres with different anode structures for micro-tubular solid oxide fuel cells. / Othman, Mohd Hafiz Dzarfan; Droushiotis, Nicolas; Wu, Zhentao; Kelsall, Geoff; Li, K.

In: Journal of Power Sources, Vol. 205, 01.05.2012, p. 272-280.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Dual-layer hollow fibres with different anode structures for micro-tubular solid oxide fuel cells

AU - Othman, Mohd Hafiz Dzarfan

AU - Droushiotis, Nicolas

AU - Wu, Zhentao

AU - Kelsall, Geoff

AU - Li, K.

PY - 2012/5/1

Y1 - 2012/5/1

N2 - In this study, a high performance micro-tubular solid oxide fuel cell (SOFC) has been developed by depositing a multi-layer cathode onto an improved electrolyte/anode dual-layer hollow fibre fabricated via a single-step co-extrusion/co-sintering technique. The use of 0-20 wt.% of ethanol in the inner layer spinning suspension allows the control over the asymmetric structure of the Ni-CGO anode layer, i.e. finger-like voids structure covering about 50-85% of the anode layer thickness with the rest volume occupied by sponge-like structure, and at the same time affects the morphology of the CGO electrolyte layer. The presence of finger-like voids significantly facilitates the fuel gas diffusion inside the anode, and as a result, the maximum power density increases from 1.84 W m -2 to 2.32 W cm -2, when the finger-like voids is increased from 50% to 70% of the asymmetric anode layer. However, further growth of finger-like voids, i.e. 85% of the anode layer, dramatically reduce the number of triple-phase boundary (TPB) region and conductivity in the anode, as well as the gas-tightness property of the electrolyte, which consequently decreases the maximum power density to 0.99 W cm -2. Based on the results obtained, therefore, dual-layer hollow fibres with 50-70% of finger-like voids in the anode layer can be considered as the ideal structure for producing high performance micro-tubular SOFCs.

AB - In this study, a high performance micro-tubular solid oxide fuel cell (SOFC) has been developed by depositing a multi-layer cathode onto an improved electrolyte/anode dual-layer hollow fibre fabricated via a single-step co-extrusion/co-sintering technique. The use of 0-20 wt.% of ethanol in the inner layer spinning suspension allows the control over the asymmetric structure of the Ni-CGO anode layer, i.e. finger-like voids structure covering about 50-85% of the anode layer thickness with the rest volume occupied by sponge-like structure, and at the same time affects the morphology of the CGO electrolyte layer. The presence of finger-like voids significantly facilitates the fuel gas diffusion inside the anode, and as a result, the maximum power density increases from 1.84 W m -2 to 2.32 W cm -2, when the finger-like voids is increased from 50% to 70% of the asymmetric anode layer. However, further growth of finger-like voids, i.e. 85% of the anode layer, dramatically reduce the number of triple-phase boundary (TPB) region and conductivity in the anode, as well as the gas-tightness property of the electrolyte, which consequently decreases the maximum power density to 0.99 W cm -2. Based on the results obtained, therefore, dual-layer hollow fibres with 50-70% of finger-like voids in the anode layer can be considered as the ideal structure for producing high performance micro-tubular SOFCs.

KW - Asymmetric structure

KW - Co-extrusion

KW - Dual-layer hollow fibre

KW - Finger-like voids

KW - Micro-tubular SOFC

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