Preparation and Properties of (YCa)(TiMn)O3−δ Ceramics Interconnect of Solid Oxide Fuel Cells

Materials

Yi-Cheng Liou¹  Wen-Chou Tsai¹  Hao-Hsuan Yen¹  Yung-Chia Chang¹ 

[1] Department of Electronic Engineering, Kun Shan University, No.195, Kunda Rd., Yongkang Dist., Tainan City 71070, Taiwan; E-Mails:

关键词: (YCa)(TiMn)O_3−δ;    interconnect;    solid oxide fuel cells;   

DOI  :  10.3390/ma8074239

来源: mdpi

【 摘 要 】

(YCa)(TiMn)O_3–δ ceramics prepared using a reaction-sintering process were investigated. Without any calcination involved, the mixture of raw materials was pressed and sintered directly. Y₂Ti₂O₇ instead of YTiO₃ formed when a mixture of Y₂O₃ and TiO₂ with Y/Ti ratio 1/1 were sintered in air. Y₂Ti₂O₇, YTiO_2.085 and some unknown phases were detected in Y_0.6Ca_0.4Ti_0.6Mn_0.4O_3–δ. Monophasic Y_0.6Ca_0.4Ti_0.4Mn_0.6O_3–δ ceramics were obtained after 1400–1500 °C sintering. Dense Y_0.6Ca_0.4Ti_0.4Mn_0.6O_3–δ with a density 4.69 g/cm³ was observed after 1500 °C/4 h sintering. Log σ for Y_0.6Ca_0.4Ti_0.6Mn_0.4O_3–δ increased from –3.73 Scm^–1 at 350 °C to –2.14 Scm^–1 at 700 °C. Log σ for Y_0.6Ca_0.4Ti_0.4Mn_0.6O_3–δ increased from –2.1 Scm^–1 at 350 °C to –1.36 Scm^–1 at 700 °C. Increasing Mn content decreased activation energy E_a and increased electrical conductivity. Reaction-sintering process is proved to be a simple and effective method to obtain (YCa)(TiMn)O_3–δ ceramics for interconnects in solid oxide fuel cells.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.