Manganese-doped lanthanum calcium titanate as an interconnect for flat-tubular solid oxide fuel cells
| Autor: | Niloufar Raeis Hosseini, Nigel M. Sammes, Jong Shik Chung |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Open-circuit voltage Inorganic chemistry Oxide Energy Engineering and Power Technology chemistry.chemical_element law.invention Calcium titanate chemistry.chemical_compound chemistry Chemical engineering law Oxidizing agent Lanthanum Solid oxide fuel cell Calcination Electrical and Electronic Engineering Physical and Theoretical Chemistry Perovskite (structure) |
| Zdroj: | Journal of Power Sources. 245:599-608 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/j.jpowsour.2013.07.010 |
| Popis: | A cost-effective screen-printing process is developed to fabricate a dense layer of solid oxide fuel cell (SOFC) interconnect material. A series of lanthanum–manganese-doped CaTiO 3 perovskite oxides (La 0.4 Ca 0.6 Ti 1− x Mn x O 3− δ ; ( x = 0.0, 0.2, 0.4, 0.6)) powders is successfully synthesized using an EDTA-citrate method and co-sintered as an interconnect material on an extruded porous anode substrate in a flat-tubular solid oxide fuel cell. All samples adopt a single perovskite phase after calcination at 950 °C for 5 h. High-temperature XRD confirms that the perovskite structure is thermally stable in both oxidizing and reducing conditions. The highest electrical conductivity occurs when x = 0.6; at 12.20 S cm −1 and 2.70 S cm −1 under oxidizing and reducing conditions. The thermal expansion coefficient of La 0.4 Ca 0.6 Ti 0.4 Mn 0.6 O 3 is 10.76 × 10 −6 K −1 , which closely matches that of 8 mol% yttria-stabilized zirconia. Chemical compatibility of samples and their reduction stability are verified at the operating temperature. The power density and area-specific resistance value at x = 0.6 is 208 mW cm −1 and 1.23 Ω cm 2 at 800 °C under open circuit voltage, and 200 mV signal amplitude under 3% humidified hydrogen and air respectively. This performance indicates that La 0.4 Ca 0.6 Ti 0.4 Mn 0.6 O 3− δ has potential for use as interconnect in a flat tubular SOFC. |
| Databáze: | OpenAIRE |
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