Title: Effect of Pressurization on Solid Oxide Cell Oxygen Electrodes: the Role of PrOx Nanoparticle Infiltration

Journal Article · · Journal of the Electrochemical Society
ORCiD logo [1];  [2]
  1. Northwestern University, Evanston, IL (United States); Northwestern University
  2. Northwestern University, Evanston, IL (United States)
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Pressurization of solid oxide cells improves performance by reducing electrode polarization resistance (RP) and facilitates system integration with balance of plant components such as pressurized storage tanks. However, there are few reports on pressurization effects for electrodes designed for low-temperature operation and utilizing infiltrated catalysts. Here we report an electrochemical impedance spectroscopy study of high performing oxygen electrode materials, SrTi0.3Fe0.63Co0.07O3-∂ (STFC) and PrOx infiltrated STFC, for oxygen partial pressures ($$p$$$$o$$2) from 0.1 to 8 atm and temperatures from 550 to 650 °C. decreases more with pressurization for STFC:PrOx, fitting well to with an exponent n~0.3, compared to n~0.25 for STFC. The combination of PrOx infiltration and pressurization yields a substantial RP decrease, e.g., at 600 °C by ~7 times from 0.36 Ω cm2 at $$p$$$$o$$2 = 0.2 atm for STFC to 0.055 Ω cm2 at $$p$$$$o$$2 = 4 atm for STFC:PrOx. Here, a transmission-line-based circuit model impedance fit reveals that the significant oxygen surface reaction (Rsurf) resistance contribution decreases substantially with PrOx infiltration; and its $$p$$$$o$$2 dependence become more pronounced, with n increasing from ~0.25 to ~0.5. Rsurf for STFC:PrOx decreases so much at elevated $$p$$$$o$$2 that the electrode/electrolyte interface resistance dominates.

Research Organization:
Northwestern University, Evanston, IL (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Hydrogen Fuel Cell Technologies Office (HFTO)
Grant/Contract Number:
EE0008437
OSTI ID:
2434040
Journal Information:
Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 8 Vol. 168; ISSN 0013-4651
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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