Perovskite SrFe1-xTixO3-δ (x < = 0.1) cathode for low temperature solid oxide fuel cell
journal contributionposted on 03.05.2018, 10:37 authored by Naveed Mushtaq, Chen Xia, Wenjing Dong, G. Abbas, Rizwan Raza, Amjad Ali, Sajid Rauf, Baoyuan Wang, Jung-Sik Kim, Bin Zhu
© 2018 Elsevier Ltd and Techna Group S.r.l. Stable and compatible cathode materials are a key factor for realizing the low-temperature (LT, ≤600 °C) operation and practical implementations of solid oxide fuel cells (SOFCs). In this study, perovskite oxides SrFe 1-x Ti x O 3-δ (x < = 0.1), with various ratios of Ti doping, are prepared by a sol-gel method for cathode material for LT-SOFCs. The structure, morphology and thermo-gravimetric characteristics of the resultant SFT powders are investigated. It is found that the Ti is successfully doped into SrFeO 3-δ to form a single phase cubic perovskite structure and crystal structure of SFT shows better stability than SrFeO 3-δ . The dc electrical conductivity and electrochemical properties of SFT are measured and analysed by four-probe and electrochemical impedance spectra (EIS) measurements, respectively. The obtained SFT exhibits a very low polarization resistance (R p ),.01 Ωcm 2 at 600◦C. The SFT powders using as cathode in fuel cell devices, exhibit maximum power density of 551 mW cm −2 with open circuit voltage (OCV) of 1.15 V at 600◦C. The good performance of the SFT cathode indicates a high rate of oxygen diffusion through the material at cathode. By enabling operation at low temperatures, SFT cathodes may result in a practical implementation of SOFCs.
This work was supported by National Natural Science Foundation of China (NSFC) under the grant # 11604088 and NSFC 51772080.
- Aeronautical, Automotive, Chemical and Materials Engineering
- Aeronautical and Automotive Engineering