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Oxygen reduction reaction kinetics in Sr-doped La2NiO4+δ Ruddlesden-Popper phase as cathode for solid oxide fuel cells

Journal Article · · Journal of the Electrochemical Society
DOI:https://doi.org/10.1149/2.0541507jes· OSTI ID:1267275
 [1];  [2];  [2];  [2]
  1. West Virginia Univ., Morgantown, WV (United States); west virginia university
  2. West Virginia Univ., Morgantown, WV (United States)

In this study, electro-catalytic reduction of oxygen in Sr-doped lanthanum nickelates, La2-xSrxNiO4+δ (0 ≤ x ≤ 0.4) Ruddlesden-Popper (R-P) phase, has been investigated. The oxygen reduction reaction (ORR) kinetics is evaluated via electrochemical impedance spectroscopy (EIS) with the symmetric cell configuration. The maximum performance is achieved with the un-doped La2NiO4+δ, ~0.13 Ωcm2 at 800°C. Sr doping decreases the electrode performance progressively. Further detailed analysis indicates that bulk ionic diffusion and surface oxygen exchange co-limit the ORR of those cathodes. Sr substitution leads to both lowered bulk diffusion and surface exchange rates. With high Sr content (x = 0.3, 0.4), oxygen ion transfer resistance between nickelate/electrolyte is observed. As for the surface exchange process, oxygen adsorption is suggested to be the main rate-limiting step (RLS) according to the reaction orders, which is retarded further by the oxidation of Ni2+ to Ni3+ as Sr content increases. Furthermore, the possible role of incorporation process in determining the overall reaction rate is also discussed.

Research Organization:
West Virginia Univ., Morgantown, WV (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
FE0009675
OSTI ID:
1267275
Journal Information:
Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 7 Vol. 162; ISSN 0013-4651
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (8)