Lanthanum based iron and cobalt-containing perovskite using an inorganic nanodispersants aqueous solution

作者：Jin Hyun Woo; Kim Ju Hee; Park Young Min; Choi Changhoon; Kim Hyun Jong; Kim Haekyoung

来源：Journal of Ceramic Processing Research, 2012, 13: S286-S290.

• Solid oxide fuel cell
• La0.58Sr0.4Co0.2Fe0.8O3-delta
• Nanodispersant
• Anode supported cell
• Mixed ionic electronic conductor

Nano structured lanthanum based iron and cobalt-containing perovskite has a high potential for a cathode material in intermediate temperature solid oxide fuel cells (IT-SOFCs) (700 - 800 degrees C) due to its high electro-catalytic activity at a relatively low operating temperature. In this study, nanocrystalline La0.58Sr0.4Co0.2Fe0.8O3-delta(LSCF) materials are successfully synthesized using a complex method with carbon black (CB) and aqueous dispersion of carbon black (AqCB) as inorganic nanodisperasnts. When AqCB is used as dispersants, the surface areas of LSCF powder increase from 25 m(2) g(-1) to 40 m(2) g(-1). The cathode sintered at 800 degrees C of LSCF with CB shows polarizations of 0.10 Omega cm(2) and 0.28 Omega cm(2) at 700 degrees C and 650 degrees C, respectively. The polarizations of LSCF with AqCB are 0.08 Omega cm(2) and 0.13 Omega cm(2) at 700 degrees C and 650 degrees C, respectively. The increment in surface area of AqCB-LSCF results in a lower cathode polarization and a higher electro-catalytic activity. The aqueous dispersion of CB is a good candidate as an inorganic dispersant for synthesis of nanocrystalline cathode materials in views of enhanced catalytic activity and lowered contamination.

• 出版日期2012-11