Oxygen surface exchange properties and electrochemical activity of lanthanum nickelates
نویسندگان
چکیده
Oxygen surface exchange properties of lanthanum nickelates La2NiO4+?, La3Ni2O7-? and La4Ni3O10-? (LNOs) have been investigated using the Pulsed Isotope 18O/16O Exchange (PIE) technique in temperature range 300–700 ?°C. The evaluation oxygen rate from these was conducted by measurement isotope fractions 18O2, 16O18O, 16O2 effluent pulse at exhaust reactor with a packed bed. rates heterogenous (rH), dissociative adsorption (ra) incorporation (ri) were calculated. found to vary between three nickelates, rH decreasing samples ?> ?La4Ni3O10-? ?La2NiO4+?, which attributed presence Ni cations on particle surfaces. Despite possessing lowest exchange, La2NiO4+? had best electrode electrochemical performance, highly mobile interstitial atoms leading largest ri (surface into bulk) nickelates. This study reveals key limiting factors determining nickelate cathode performance SOFCs, we suggest avenues improve materials towards functional cathodes devices.
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ژورنال
عنوان ژورنال: Journal of Solid State Chemistry
سال: 2022
ISSN: ['0022-4596', '1095-726X']
DOI: https://doi.org/10.1016/j.jssc.2022.123228