Flame spray synthesis of nano lanthanum strontium manganite for solid oxide fuel cell applications
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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.
KeywordsFSP LSM SOFC Impedance spectroscopy
- 21.Kawagoe Y, Namie S, Nomura M, Kumakura T, Shiozaki K, Nakajima Y, U. Stimming, S. Singhal, H. Tagawa, W. Lehnert (Eds.), Solid oxide fuel cells V, The Electrochemical Society, Pennington, (1997) 549.Google Scholar
- 23.Antunes R, Golec T, Miller M, Kluczowski R, Krauz M and Krzastek K, Journal of Fuel Cell Science and Technology, 7 (2010).Google Scholar