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Fabrication of novel electrolyte-layer free fuel cell with semi-ionic conductor (Ba0.5Sr0.5Co0.8Fe0.2O3-delta- Sm0.2Ce0.8O1.9) and Schottky barrier
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics.ORCID iD: 0000-0001-5380-975X
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.ORCID iD: 0000-0002-3133-7031
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2016 (English)In: Journal of Power Sources, ISSN 0378-7753, E-ISSN 1873-2755, Vol. 328, 136-142 p.Article in journal (Refereed) Published
Abstract [en]

Perovskite Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF) is synthesized via a chemical co-precipitation technique for a low temperature solid oxide fuel cell (LTSOFC) (300-600 degrees C) and electrolyte-layer free fuel cell (EFFC) in a comprehensive study. The EFFC with a homogeneous mixture of samarium doped ceria (SDC): BSCF (60%:40% by weight) which is rather similar to the cathode (SDC: BSCF in 50%:50% by weight) used for a three layer SOFC demonstrates peak power densities up to 655 mW/cm(2), while a three layer (anode/ electrolyte/cathode) SOFC has reached only 425 mW/cm(2) at 550 degrees C. Chemical phase, crystal structure and morphology of the as-prepared sample are characterized by X-ray diffraction and field emission scanning electron microscopy coupled with energy dispersive spectroscopy. The electrochemical performances of 3-layer SOFC and EFFC are studied by electrochemical impedance spectroscopy (EIS). As-prepared BSCF has exhibited a maximum conductivity above 300 S/cm at 550 degrees C. High performance of the EFFC device corresponds to a balanced combination between ionic and electronic (holes) conduction characteristic. The Schottky barrier prevents the EFFC from the electronic short circuiting problem which also enhances power output. The results provide a new way to produce highly effective cathode materials for LTSOFC and semiconductor designs for EFFC functions using a semiconducting-ionic material.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 328, 136-142 p.
Keyword [en]
Co-precipitation, Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF), LTSOFC, Electrolyte-layer free fuel cell (EFFC), Perovskite oxide, Semi-ionic conductor
National Category
Materials Chemistry Inorganic Chemistry Ceramics
Identifiers
URN: urn:nbn:se:kth:diva-193795DOI: 10.1016/j.jpowsour.2016.07.093ISI: 000383293400015Scopus ID: 2-s2.0-84984850892OAI: oai:DiVA.org:kth-193795DiVA: diva2:1039532
Funder
EU, FP7, Seventh Framework Programme, TRISOFC_03042012Swedish Research Council, 621-2011-4983ÅForsk (Ångpanneföreningen's Foundation for Research and Development)
Note

QC 20161024

Available from: 2016-10-24 Created: 2016-10-11 Last updated: 2017-02-22Bibliographically approved

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