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The electrolyte-layer free fuel cell using a semiconductor-ionic Sr2Fe1.5Mo0.5O6-delta - Ce0.8Sm0.2O2-delta composite functional membrane
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2017 (English)In: International journal of hydrogen energy, ISSN 0360-3199, E-ISSN 1879-3487, Vol. 42, no 39, p. 25001-25007Article in journal (Refereed) Published
Abstract [en]

Commercial double Perovskite Sr2Fe1.5Mo0.5O6-delta (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-delta (SDC) and SFM achieved a higher power density (841 mW cm(-2)) at 550 degrees C, while the SDC electrolyte based SOFC, using the SDC-SFM composite as cathode, just reached 326 mW cm(-2) 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.

Place, publisher, year, edition, pages
Pergamon Press, 2017. Vol. 42, no 39, p. 25001-25007
Keywords [en]
Sr2Fe1.5Mo0.5O6-delta (SFM), Electrolyte-free, Ce0.8Sm0.2O2-delta (SDC), Semiconductor-ionic material, Electrolyte based SOFC, Schottky junction
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-217210DOI: 10.1016/j.ijhydene.2017.08.113ISI: 000413125900038Scopus ID: 2-s2.0-85028761854OAI: oai:DiVA.org:kth-217210DiVA, id: diva2:1154487
Note

QC 20171102

Available from: 2017-11-02 Created: 2017-11-02 Last updated: 2017-11-02Bibliographically approved

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