Accelerated Anode Failure of a High Temperature Planar SOFC Operated with Reduced Moisture and Increased PH₃ Concentrations in Coal Syngas
Electrolyte supported SOFCs with Ni-YSZ/Ni-GDC bi-layer anodes were operated at 800 °C and 900 °C with 8% H2O and 10-20 ppm of PH3/syngas to reduce steam-related interference accelerate degradation. Cell power output degraded rapidly within the first 12 h, with even faster degradation at 900 °C. Nickel phosphide phases detected in the anode include Ni3P, Ni12P5 and Ni5P2, while CePO4 formed in the catalyst layer. Irrespective of the electrolyte component used, phosphorus penetrated to the anode-electrolyte interface in electrically loaded cells, as well as with Ni-GDC cells in coupon tests. In contaminated bi-layer anodes, phosphorus appeared to concentrate away from the surface, suggesting oxidation of PH3 when steam rich environments were present.
K. C. De Silva et al., "Accelerated Anode Failure of a High Temperature Planar SOFC Operated with Reduced Moisture and Increased PH₃ Concentrations in Coal Syngas," International Journal of Hydrogen Energy, vol. 36, no. 16, pp. 9945 - 9955, Elsevier Ltd, Aug 2011.
The definitive version is available at https://doi.org/10.1016/j.ijhydene.2011.04.169
Mechanical and Aerospace Engineering
Keywords and Phrases
Anode Poisoning; PH3 Contaminated Syngas; Solid Oxide Fuel Cells (SOFCs)
International Standard Serial Number (ISSN)
Article - Journal
© 2011 Hydrogen Energy Publications, LLC, All rights reserved.
01 Aug 2011