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Title: Enhanced surface exchange activity and electrode performance of (La2–2xSr2x)(Ni1–xMnx)O4+δ cathode for intermediate temperature solid oxide fuel cells

Journal Article · · Journal of Power Sources

Surface exchange kinetics of Ruddlesden-Popper (R-P) phase lanthanum nickelates upon Mn doping as an intermediate temperature solid oxide fuel cells (IT-SOFCs) cathode is investigated for the first time in this communication. To promote the exchange rate in oxygen reduction reaction (ORR) on nickelates, Mn is partially substituted for Ni. The oxygen exchange resistance is accurately measured by electrochemical impedance spectroscopy (EIS) with dense thin layer cathode. It is found that Mn substantially promotes the surface kinetics; a surface exchange coefficient (k) of 1.57 × 10–6 cm/s is obtained at 700 °C for La1.8Sr0.2Ni0.9Mn0.1O4+δ (Sr20Mn10), ~80% higher than that of the undoped La2NiO4+δ (LNO). To our best knowledge, such coefficient is the highest values among the currently available R-P phase IT-SOFC cathodes. The corresponding polarization resistances (Rp) are evaluated on porous electrodes. Rp for LNO is 0.74 Ωcm2 at 750 °C, but decreases significantly to 0.42 Ωcm2 for Sr20Mn10 which is remarkably improved compared to the reported values in the literature for La2MO4+δ materials (M = transition metal). In conclusion, those promising results demonstrate that Mn-doped LNO is a new excellent cathode material for IT-SOFC.

Research Organization:
West Virginia Univ., Morgantown, WV (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
FE0009675; FE00009675
OSTI ID:
1267278
Alternate ID(s):
OSTI ID: 1359470
Journal Information:
Journal of Power Sources, Vol. 318, Issue C; ISSN 0378-7753
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 36 works
Citation information provided by
Web of Science

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