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New mechanistic insight into the oxygen reduction reaction on Ruddlesden–Popper cathodes for intermediate-temperature solid oxide fuel cells

Journal Article · · Physical Chemistry Chemical Physics. PCCP
DOI:https://doi.org/10.1039/C6CP00056H· OSTI ID:1267277
 [1];  [2];  [2];  [2];  [2];  [2]
  1. West Virginia Univ., Morgantown, WV (United States); West Virginia University
  2. West Virginia Univ., Morgantown, WV (United States)
Ruddlesden–Popper (R–P) phase materials have been investigated widely as cathode candidates for IT-SOFCs. However, widespread application of R–P phase cathodes demands further improvement in electrode activity whose progress is hindered by the limited information in the oxygen reduction reaction (ORR). The ORR mechanism for the R–P phase is therefore investigated in this paper using (LaSr)2NiO4±δ as an example. Accurate characterization of the surface oxygen exchange process is realized by developing thin and dense polycrystalline LSNO layers via a versatile spray-modified pressing method we invented before to avoid perceptible bulk diffusion contribution, surface enrichment and geometry complication. Hence, the governing factors of the ORR are identified as oxygen adsorption and incorporation based on the findings in reaction orders from electrochemical impedance spectroscopy (EIS), stoichiometry-related chemical capacitance and intrinsic anisotropic properties.
Research Organization:
West Virginia Univ., Morgantown, WV (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
FE0009675
OSTI ID:
1267277
Journal Information:
Physical Chemistry Chemical Physics. PCCP, Journal Name: Physical Chemistry Chemical Physics. PCCP Journal Issue: 12 Vol. 18; ISSN 1463-9076; ISSN PPCPFQ
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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