TY - JOUR
T1 - Novel fabrication technique of hollow fibre support 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 - 2011/6/1
Y1 - 2011/6/1
N2 - In this work, a cerium-gadolinium oxide (CGO)/nickel (Ni)-CGO hollow fibre (HF) for micro-tubular solid oxide fuel cells (SOFCs), which consists of a fully gas-tight outer electrolyte layer supported on a porous inner composite anode layer, has been developed via a novel single-step co-extrusion/co-sintering technique, followed by an easy reduction process. After depositing a multi-layers cathode layer and applying current collectors on both anode and cathode, a micro-tubular SOFC is developed with the maximum power densities of 440-1000 W m-2 at 450-580 °C. Efforts have been made in enhancing the performance of the cell by reducing the co-sintering temperature and improving the cathode layer and current collection from inner (anode) wall. The improved cell produces maximum power densities of 3400-6800 W m-2 at 550-600 °C, almost fivefold higher than the previous cell. Further improvement has been carried out by reducing thickness of the electrolyte layer. Uniform and defect-free outer electrolyte layer as thin as 10 μm can be achieved when the extrusion rate of the outer layer is controlled. The highest power output of 11,100 W m-2 is obtained for the cell of 10 μm electrolyte layer at 600 °C. This result further highlights the potential of co-extrusion technique in producing high quality dual-layer HF support for micro-tubular SOFC.
AB - In this work, a cerium-gadolinium oxide (CGO)/nickel (Ni)-CGO hollow fibre (HF) for micro-tubular solid oxide fuel cells (SOFCs), which consists of a fully gas-tight outer electrolyte layer supported on a porous inner composite anode layer, has been developed via a novel single-step co-extrusion/co-sintering technique, followed by an easy reduction process. After depositing a multi-layers cathode layer and applying current collectors on both anode and cathode, a micro-tubular SOFC is developed with the maximum power densities of 440-1000 W m-2 at 450-580 °C. Efforts have been made in enhancing the performance of the cell by reducing the co-sintering temperature and improving the cathode layer and current collection from inner (anode) wall. The improved cell produces maximum power densities of 3400-6800 W m-2 at 550-600 °C, almost fivefold higher than the previous cell. Further improvement has been carried out by reducing thickness of the electrolyte layer. Uniform and defect-free outer electrolyte layer as thin as 10 μm can be achieved when the extrusion rate of the outer layer is controlled. The highest power output of 11,100 W m-2 is obtained for the cell of 10 μm electrolyte layer at 600 °C. This result further highlights the potential of co-extrusion technique in producing high quality dual-layer HF support for micro-tubular SOFC.
KW - Co-extrusion
KW - Co-sintering
KW - Dual-layer hollow fibre
KW - Micro-tubular SOFC
UR - http://www.scopus.com/inward/record.url?scp=79952985650&partnerID=8YFLogxK
UR - https://www.sciencedirect.com/science/article/pii/S0378775311003600?via%3Dihub
U2 - 10.1016/j.jpowsour.2011.02.006
DO - 10.1016/j.jpowsour.2011.02.006
M3 - Article
AN - SCOPUS:79952985650
SN - 0378-7753
VL - 196
SP - 5035
EP - 5044
JO - Journal of Power Sources
JF - Journal of Power Sources
IS - 11
ER -