Trace impurities in coal-derived syngas pose a threat on the performance and durability of solid oxide fuel cells (SOFCs) operated in syngas. A Ni-YSZ/YSZ/Ni-YSZ (YSZ stands for yttria-stabilized zirconia) half-cell is constructed in order to evaluate the effects of a phosphorus impurity on the performance of the Ni-YSZ cermet anode in the simulated coal-derived syngas containing 30.6% H2, 30% CO, 11.8% CO2, 27.6% H 2O and 20 ppm PH3. Electrochemical impedance analysis shows that both the charge transfer resistance and the diffusion resistance increase with time during exposure to the P-containing syngas. The diffusion resistance increases faster than the charge transfer resistance. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) studies show that phosphorus is incorporated into the Ni-YSZ electrode, leading to the formation of secondary phases of nickel phosphate and zirconium phosphate. The incorporation of phosphorus into the anode is accelerated by an applied electric field.
- Solid oxide fuel cell
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Energy Engineering and Power Technology
- Physical and Theoretical Chemistry
- Electrical and Electronic Engineering