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Research on Graded Cathode and Composite Electrolyte of Solid Oxide Fuel Cells

Author: YangWeiGe
Tutor: ChengZuo；WengWenJian
School: Zhejiang University
Course: Materials Science and Engineering
Keywords: The solid oxide fuel cell In the low-temperature Cathode Gradient Electrolyte Complex Ceramic materials Glass material
CLC: TM911.4
Type: Master's thesis
Year: 2011
Downloads: 69
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Abstract

The solid oxide fuel cell (solid oxide fuel cell, SOFC), in the electrochemical process, the hydrogen fuel of the chemical energy into electrical energy, is one of the most effective devices having the advantages of high power density, low emissions. The SOFC is divided into an oxygen ion conductivity SOFC (SOFC-O), the proton conductance SOFC (SOFC-H) and mixed conductance the SOFC. Low temperature, a research direction for the SOFC, the SOFC-O gradient cathode and the SOFC-H composite electrolyte. (1) SOFC-O graded Cathode electrolyte film after the main factors affecting the efficiency of the battery under low temperature conditions of the catalytic activity of the electrode and polarization losses. Cause the battery to reduce the working temperature of SOFC cathode polarization resistance increases rapidly, it is necessary to reduce the cathode polarization resistance to ensure that the SOFC ideal electrochemical performance in low temperature conditions. In order to reduce the resistance of the electrode polarization, this article uses a mixed ionic and electronic conductivity of the electrode material (SSC-SDC), and optimizing the electrode microstructure, i.e. the preparation of functional graded multilayer cathode. The results show that the composite slurry was spin-coated bonding heat treatment can be effectively produced on the substrate surface of a composite cathode layer, the cathode layer and the substrate and the prepared good combination; realized by using the powder of the amino-acetic acid method and solid-phase synthesis prepared cathode the regulation of the grain size; by controlling the slurry SSC and SDC obtained the relative content of the composition gradient; effectively control the content of the pore forming agent in the regulation of porosity in the SOFC, low temperature, to thereby obtain the gradient of the cathode has a good application value. (2) SOFC-H composite electrolyte proton conductance electrolyte is a low temperature SOFC development trend. For proton exchange membrane fuel cell of the proton conductivity of the glass compound, with the conventional electrically conductive material of the ceramic matrix sub of utilization both proton conductivity characteristics at low temperature as well as in low temperature conditions, respectively, the combination of the two different proton conductivity mechanism, to extend the SOFC operating temperature range. Experimental results show that the composite electrolyte of the lower sintering temperature, density increase. The higher the conductivity of the composite electrolyte component is 100? ZY is relatively low conductivity of the electrolyte. Output performance, the incorporation of the glass, so that the battery cell has higher and more stable output performance in a wider operating temperature range, the effective realization of the low temperature of the SOFC.

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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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