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Preparation and Properties of Doped Titanate Anode for Direct Oxidation of Hydrocarbon Fuels in Solid Oxide Fuel Cells

Author: DaiNa
Tutor: GuoRuiSong
School: Tianjin University
Course: Materials Science
Keywords: The solid oxide fuel cell Anode material Direct oxidation Ion electron mixed conductor Perovskite
CLC: TM911.4
Type: Master's thesis
Year: 2007
Downloads: 88
Quote: 0
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Abstract


The direct electrochemical oxidation of hydrocarbon fuels is an important research direction of the solid oxide fuel cell . Doped strontium titanate material is a hydrocarbon fuel with good catalytic properties of ion - electron mixed conductor is considered to have potential application as SOFC anode material . In this paper, the solid-phase method , a new type of perovskite structure anode materials : lanthanum , gallium and manganese composite doped strontium titanate composite doping , to further enhance the performance of the material . By scanning electron microscopy analysis of the sintered body by thermogravimetric differential thermal ( DSC - TG ) analysis to determine the powder pre - synthesis system using X-ray diffraction analysis of pre - synthetic powder crystal structure, thermal expansion analysis to determine the best powder sintering system ; micro structure, using the four-electrode method test sample conductivity, and material density, strength and other physical properties were tested . Powder at 1060 ° C synthesis , after milling , drying and sieved to dry pressing ( 170 MPa ) and isostatic pressing ( 180 MPa ) . The test strip is loaded after forming a closed crucible , the graphite caused by the reducing atmosphere , and calcined at 1360 ° C for 2 h . The analysis results showed that : after the sintering of the material does not chemically react , and exhibit good chemical compatibility of burning at 1400 ° C under a single perovskite structure is formed , mixed with the electrolyte 8YSZ . 400 ℃ 9 00 ℃ within the composite performance of the ion - electron mixed conductive characteristics, low temperature electronically conductive doped strontium titanate materials , high temperature ionic conductivity . Material conductivity with doping substances , doping and sintering temperature . Sintered at 1360 ℃ Sr0.57La 0.29 < / sub > Ti 0.9 Mn 0.05 the 0.05 Ga < / sub > O 2.95 < / sub > the best performance , the conductivity in the 800 ° C up to 60.9 S / cm, the relative density of 96.6% , strength of 128 MPa .

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Chemical power sources,batteries, fuel cells > Fuel cell
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