Structural, thermal and electrical conductivity characteristics of Ln(0.5)Sr(0.5)Ti(0.5)Mn(0.5)O(3 +/- d) (Ln: La, Nd and Sm) complex perovskites as anode materials for solid oxide fuel cell

作者：Jeong Jihoon; Azad Abul K; Schlegl Harald; Kim Byungjun; Baek Seung Wook; Kim Keunsoo; Kang Hyunil; Kim Jung Hyun^*

来源：Journal of Solid State Chemistry, 2015, 226: 154-163.

DOI：10.1016/j.jssc.2015.02.001

• Solid oxide fuel cell (SOFC)
• Anode
• Complex perovskite
• Phase synthesis
• Electrical conductivity

The Ti and Mn replaced complex perovskites, Ln(0.5)Sr(0.5)Ti(0.5)Mn(0.5)O(3 +/- d) (Ln: La, Nd and Sm), were reported as potential anode materials for high temperature-operating solid oxide fuel cells (HT-SOFCs). For the present research study, synthesis, crystallographic, thermal and electrical conductivity properties of Ln(0.5)Sr(0.5)Ti(0.5)Mn(0.5)O(3 +/- d) a complex perovskites were investigated using X-ray diffraction (XRD), Rietveld method, thermogravimetric analysis (TGA) and electrical conductivity to apply these oxide materials for the HT-SOFC anode materials.
XRD results showed that Ln(0.5)Sr(0.5)Ti(0.5)Mn(0.5)O(3 +/- d) oxide systems synthesized as single phases did not react with 8 mol% yttria stabilized zirconia (8YSZ) and 10 mol% Gd-doped cerium oxide (CGO91) up to 1500 degrees C and did not decompose under dry 3.9% hydrogen at 850 degrees C. The crystal structures of Ln(0.5)Sr(0.5)Ti(0.5)Mn(0.5)O(3 +/- d) (LSTM), Nd0.5Sr0.5Ti0.5Mn0.5O3 +/- d (NSTM) and Sm0.5Sr0.5Ti0.5Mn0.5O3 +/- d (SSTM) showed orthorhombic symmetry with the space group Pbnm and SSTM showed a more distorted structure. Thermogravimetric analysis (TGA) proved weight gains in these three sample occurred under oxidizing conditions and weight loss under reducing conditions. Electrical conductivity values of NSTM were higher than those of LSTM and SSTM under oxidizing and reducing conditions.

• 出版日期2015-3