Au-Coated Lanthanum Strontium Cobalt Ferrite Cathode for Lowering Sheet Resistance of a Solid Oxide Fuel Cell

• Published in: International journal of precision engineering and manufacturing Vol. 20; no. 3; pp. 451 - 455
• Main Authors: Lee, Yoon Ho, Lee, Sanghoon, Zeng, Jianhuang, Cha, Suk Won, Chang, Ikwhang
• Format: Journal Article
• Language: English
• Published: Seoul Korean Society for Precision Engineering 01.03.2019; Springer Nature B.V
• Subjects: Cathode sputtering; Ceramics industry; Cobalt ferrites; Electrical resistivity; Engineering; Gold; Industrial and Production Engineering; Lanthanum; Materials Science; Operating temperature; Oxide coatings; Regular Paper; Solid oxide fuel cells; Strontium; Thin films; Yttria-stabilized zirconia; Lanthanum strontium cobaltite ferrite; Surface modification; Au; Solid oxide fuel cell; Thin film
• ISSN: 2234-7593; 2005-4602
• DOI: 10.1007/s12541-019-00013-3

In this paper, we fabricate a thin film solid oxide fuel cell (SOFC) with a lanthanum strontium cobalt ferrite (LSCF) cathode which is coated with an Au layer by sputtering. The fabricated thin film SOFC has a 370-nm-thick Ni anode/880-nm-thick YSZ electrolyte/440-nm-thick LSCF cathode/130-nm-thick Au layer. The electrochemical performances of the thin film SOFC with the LSCF cathode coated with a 130-nm-thick Au layer and another SOFC without an Au layer are measured at the operating temperature of 600 °C. Since the LSCF cathode coated with a 130-nm-thick Au layer significantly lowers the sheet resistance (in-plane direction resistance), the peak power densities of the thin film SOFC with the LSCF cathode coated with a 130-nm-thick Au layer and the thin film SOFC with the LSCF cathode without a 130-nm-thick Au layer are 500 mW/cm 2 and 49 mW/cm 2 , respectively. Due to the LSCF cathode coated with a 130-nm-thick Au layer, the peak power density of the thin film SOFC with the Au-coated LSCF cathode is 10 times higher than that of the LSCF cathode without Au layer.