Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5145130 | International Journal of Hydrogen Energy | 2017 | 7 Pages |
Abstract
Commercial double Perovskite Sr2Fe1.5Mo0.5O6-δ (SFM), a high performance and redox stable electrode material for solid oxide fuel cell (SOFC), has been used for the electrolyte (layer) -free fuel cell (EFFC) and also as the cathode for the electrolyte based SOFC in a comprehensive study. The EFFC with a homogeneous mixture of Ce0.8Sm0.2O2-δ (SDC) and SFM achieved a higher power density (841 mW cmâ2) at 550 °C, while the SDC electrolyte based SOFC, using the SDC-SFM composite as cathode, just reached 326 mW cmâ2 at the same temperature. The crystal structure and the morphology of the SFM-SDC composite were characterized by X-ray diffraction analysis (XRD), and scanning electron microscope (SEM), respectively. The electrochemical impedance spectroscopy (EIS) results showed that the charge transfer resistance of EFFCs were much lower than that of the electrolyte-based SOFC. To illustrate the operating principle of EFFC, we also conducted the rectification characteristics test, which confirms the existence of a Schottky junction structure to avoid the internal electron short circuiting. This work demonstrated advantages of the semiconductor-ionic SDC-SFM material for advanced EFFCs.
Keywords
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Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Hui Deng, Chu Feng, Wei Zhang, Youquan Mi, Xunying Wang, Wenjing Dong, Baoyuan Wang, Bin Zhu,