Babu, Deepu J. ; Darbandi, Azad J. ; Suffner, Jens ; Bhattacharya, S. S. ; Hahn, Horst (2011)
Flame spray synthesis of nano lanthanum strontium manganite for solid oxide fuel cell applications.
In: Transactions of the Indian Institute of Metals, 64 (1-2)
doi: 10.1007/s12666-011-0035-3
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

Lanthanum strontium manganite is a classic cathode material for solid oxide fuel cells (SOFC). Nanosized LSM particles, due to their higher specfic surface area, have been found to enhance the electrode performance by providing a larger three phase boundary (TPB) area. However conventional processes like solid state, sol-gel or co-precipitation, produce particles having low specic surface area (< 8 m2/g) and hence require high sintering temperatures. Moreover these processes are multi-step and are hence time consuming. In the present work, single phase LSM with a crystallite size of 26 nm and a specfic surface area as high as 40 m2/g was produced by a flame spray pyrolysis method. The as-synthesized powder was characterized by X-ray diffraction (XRD), nitrogen adsorption, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Porous thin films were prepared by spin coating a water based dispersion of LSM. Electrochemical performance of the nanoparticulate cathode films were studied using impedance spectroscopy. Interfacial polarization resistance value of as low as 0.085 Ωcm 2 at 850°C was obtained by this method. This method thus offers a very cost effective approach for the preparation of highly active cathode thin films for SOFC applications.

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