Accelerated Anode Failure of a High Temperature Planar SOFC Operated with Reduced Moisture and Increased PH₃ Concentrations in Coal Syngas

Abstract

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.

Department(s)

Mechanical and Aerospace Engineering

Keywords and Phrases

Anode Poisoning; PH3 Contaminated Syngas; Solid Oxide Fuel Cells (SOFCs)

International Standard Serial Number (ISSN)

0360-3199

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2011 Hydrogen Energy Publications, LLC, All rights reserved.

Publication Date

01 Aug 2011

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