Investigation of cobalt-free perovskite Sr2FeTi0.75Mo0.25O6−δ as new cathode for solid oxide fuel cells. (February 2016)

• Record Type: Journal Article
• Authors: Zhou, Qingjun; Cheng, Ye; Li, Weidong; Yang, Xin; Liu, Jincheng; An, Dongmin; Tong, Xiaoqiang; Zhong, Binchao; Wang, Weibo
• Is Part Of: Materials research bulletin. Volume 74(2016)
• Page Start: 129
• Page End: 133
• Publication Date: 2016-02
• Subjects: A. Oxides -- A. Ceramics -- C. Impedance spectroscopy -- D. Thermal expansion -- D. Electrochemical properties; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2015.09.023
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: To assess the electrochemical activities of Sr2 FeTi0.75 Mo0.25 O6− δ (SFTM), the cathode performance of SFTM was analyzed by AC impedance spectroscopy at various temperatures. Highlights: A new cobalt-free Sr2 FeTi0.75 Mo0.25 O6− δ (SFTM) is investigated for SOFCs. SFTM shows a chemical compatibility with respect to Ce0.8 Sm0.2 O1.9 up to 1100 °C. The average TEC of SFTM is close to that of the typical electrolyte material. SFTM shows a low R p of 0.14 Ω cm 2 at 800 °C. Abstract: The performance of Sr2 FeTi0.75 Mo0.25 O6− δ (SFTM) as a potential cathode material has been investigated in this study. The SFTM material with a cubic perovskite structure, has a good chemical compatibility with the Ce0.8 Sm0.2 O1.9 (SDC) electrolyte at 1100 °C for 10 h. The electrical conductivity of the SFTM sample reaches a maximum value of 2.31 S cm −1 at 500 °C. SFTM shows an average thermal expansion coefficient (TEC) of 13.6 × 10 −6 K −1 in the temperature range of 30–1000 °C in air, which is close to that of the typical electrolyte material. The polarization resistance ( R p ) of a SFTM cathode on a SDC electrolyte reaches a value of 0.14 Ω cm 2 at 800 °C. Peak power density of a single-cell with the SFTM cathode on a 300 μm-thick SDC electrolyte reaches 394 mW cm −2 at 800 °C. These results indicate that SFTM is a potential cathode material for solid oxide fuel cells.