Lanthanum molybdate based solid electrolyte film material and preparation thereof

Abstract

The invention discloses a lanthanum molybdate group solid electrolyte thin film material and a preparation method thereof. The material is a solid electrolyte polycrystalline thin film formed by covering a substrate with lanthanum molybdate group with the thickness between 50 nm and 10 mu m, and is formed by lanthanum molybdate group particles with the particle size between 10 and 90 nm. The method comprises the following steps: (a) according to the composition ratio of (La2-xAx)(Mo2-yBy)O9-delta, lanthanum oxide and lanthanum-site dopant oxide, nitrate or acetate, ammonium molybdate and molybdenum-site dopant oxide, nitrate or acetate are weighed and prepared into solution, and lanthanum nitrate solution, lanthanum-site dopant, molybdenum-site dopant solution and citric acid are orderly added to the ammonium molybdate solution under stirring, and then the ammonium molybdate solution is stirred for 2 to 10 hours at a temperature between 60 and 100 DEG C and then is filtered so as to obtain sol; (b) the sol is mixed with water-soluble high molecular polymer to obtain a coating colloid; and (c) the substrate coated with the coating colloid is heated to between 600 and 650 DEG C and has the heat insulated for 10 to 50 hours at a temperature between 550 and 660 DEG C, and then the material can be obtained. The material can be used as a solid electrolyte and an electrode material on a medium-temperature fuel battery or an oxygen sensor.

Description

technical field [0001] The present invention relates to a kind of film material and preparation method, especially a kind of lanthanum molybdate (La 2 Mo 2 o 9 ) based solid electrolyte film material and its preparation method. Background technique [0002] With the wide application of oxygen ion conductor materials in energy and electrochemical devices, it has become an urgent problem to develop middle and low temperature oxygen ion conductor materials with practical value. Recently, studies on bulk materials of lanthanum molybdate-based oxygen ion conductor materials have shown that such materials may be used as solid electrolytes and electrode materials in electrochemical devices such as intermediate temperature fuel cells and oxygen sensors. For this reason, people have made some attempts and various efforts, such as a kind of "lanthanum molybdate (La 2 Mo 2 o 9 )-based medium temperature ion conductor material and its preparation method”. It intends to provide a b...

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Problems solved by technology

However, both the lanthanum molybdate-based medium-temperature ionic conductor material and its preparation method have shortcomings. First, the lanthanum molybdate-based medium-temperature ionic conductor material is a ceramic block, and the grain size is too large. The scope of application is restricted, especially when it is used as a solid electrolyte, it is difficult to apply because it needs a polycrystalline film form; secondly, the finished product obtained by the preparation method is block, and polycrystalline film-like molybdenum cannot be obtained. Lanthanum acid-based materials; again, the preparation process is more complicated, and energy-consuming and time-consuming, making it difficult to reduce production costs, which is not conducive to large-scale industrial production

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