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Preparation and Study of Layered Perovskite Cobalt Oxide Sythesis as the Cathode Materials for Fuel Cells

Author: QuLiNa
Tutor: LiuYi
School: Guizhou University
Course: Materials Science
Keywords: Cobalt oxide of layered perovskite Cathode materials Intermediate temperature solid oxide fuel cell Conductivity Small polaron Thermal expansion
CLC: TM911.4
Type: Master's thesis
Year: 2009
Downloads: 29
Quote: 0
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Abstract


The solid oxide fuel cell (SOFC) is called fourth-generation fuel cell, is the internationally recognized high value fuel cell power generation efficiency, energy density; wide range of fuel use, waste heat utilization. However, SOFC running at a high temperature (800-1000 ℃) will bring a series of problems, such as battery sealing difficulties, life is short, higher cost, greatly restrict the promotion and use of SOFC. Therefore, the working temperature of 500-800 ℃ temperature solid oxide fuel cell (ITSOFC) becomes an inevitable trend for development. The cathode material is an important part of ITSOFC With the use of the decrease of temperature, will lead to increases the polarization resistance of the conventional cathode material, the conductivity decreased to a series of problems, such as the battery performance will be greatly reduced. Therefore, the search for new work under the conditions of temperature (500-800 ℃) cathode material is particularly important for the development of the SOFC temperature of. The papers prepared by the sol - gel synthesis layered perovskite structure ITSOFC cathode material YBa 1-x Ca x Co 2 O δ (x = 0 to 0.3), a systematic study of the crystal structure of the sample system, the thermal expansion properties and electrical transport properties, Ca 2 Ba site doped miscellaneous crystal structure, electrical transport properties and thermal expansion properties, and also inspected the cathode materials and electrolyte materials, high-temperature adhesion and its catalytic activity. The study found that the prepared samples after high-temperature sintering at 1100 ℃, the system has a 3 × 1 × 1-type layered perovskite structure are tetragonal, space group P 4 / mmm. Ca 2 Ba site doping significantly change YBa 1-x Ca x Co 2 O 5 δ thermal expansion properties, as X increases, the doped samples at 200 ° C -800 ° C, the thermal expansion coefficient decreases, which of YBa 0.7 Ca 0.3 < / sub> Co 2 O 5 δ with electrolyte material 8YSZ the coefficient of thermal expansion is closer, it is a good match with the electrolyte material 8YSZ; of YBa - x Ca x Cx 2 O 5 δ (x = 0 ~ 0.3) system at high temperatures has a higher conductivity , YBa 0.7 Ca 0.3 Co 2 O 5 δ high conductivity at 800 ℃ approximately 41.33 scm -1 ; doped samples in low temperature (room temperature -450 ℃) Ln (σT) and 1 / T approximate linear relationship between the electrical transport mechanisms in line with the semiconductor small polaron model . Another of YBa 0.7 Ca 0.3 Co 2 O δ and the 8YSZ electrolyte between the high-temperature adhesion performance better 820 ℃ around the interface between the cathode material and the electrolyte resistance is very small of about 4.86Ω · cm 2 , and the cathode material has a high catalytic activity, there is the normal work conducive ITSOFC.

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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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