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Research on Preparation of Composite Solid Electrolytes in Planar SO2 Sensor

Author: XuMin
Tutor: SuoJinPing
School: Huazhong University of Science and Technology
Course: Materials Science
Keywords: SO2 sensor Solid electrolyte Sodium fast ion conductor Sol - gel method .
CLC: TP212
Type: Master's thesis
Year: 2007
Downloads: 41
Quote: 0
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Abstract


Prepared in the composite solid electrolyte YSZ and NASICON electrochemical gas sensor , unnecessary to measure the oxygen partial pressure , but not need to isolate the working electrode and reference electrode, and simplifies the production of the sensor technology . Reported in the literature of this type of sensor has been applied to the measurement of CO2 gas , preliminary study literature on composite solid electrolytes SO2 sensor . On the basis of the above work , carried out in-depth research on the preparation process of the composite solid electrolyte used in flat - SO2 sensor . Specific work is as follows : in the sol - gel prepared NASICON powder on the basis of comparison , by two different types of sol - gel preparation method . Experimental results show that : the sol - PVA NASICON powder prepared by the polycondensation reaction of the sol occurs , than TEOS hydrolysis , polycondensation reaction NASICON powder phase structure of the sol prepared in a more pure , and its particle tablets diameter of 80 to 100 nm , the size distribution is uniform and spherical in shape , which has laid the foundation for subsequent preparation of a dense solid electrolyte . In this paper, four different methods of preparation NASICON/ZrO2 composite solid electrolyte . The experimental results show that : a mixture consisting of the of NASICON powders, ethyl cellulose and ethanol through the screen printing method of coating on the pretreatment on the surface of the YSZ sheet , and after a certain temperature sintering , the prepared coating layer structure of dense , the gap is less tightly bonded to the substrate . Experiments using mixtures - screen printing prepared composite solid electrolyte , and three kinds of preparation of the coating layer in the sintering temperature were analyzed. The experimental results show that : under sealed conditions , 1200 ℃ 3h sintering the crystalline integrity of the coating layer , the grain size is smaller and the Na content was significantly more . AC impedance method to test the ionic conductivity of the composite solid electrolyte used in the experiment . The test results show that : the composite electrolyte obtained at 600 ° C ambient temperature conductivity of 4.6 × 10-4 S / cm, and this result is low may be coated after the high temperature sintering process , so that the the Nasicon composition change resulting structure changes. Conductivity values ??of 10-4 order of magnitude , and the work of 600 ° C ambient temperature solid electrolyte can be used to prepare the sensor .

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