Method for preparing apatite type composite solid electrolyte ceramic material by ultrasonic-assisted sol-gel method
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A technology of sol-gel method and solid electrolyte, which is applied in the field of preparation of solid electrolyte ceramic materials
Active Publication Date: 2019-01-01
HEFEI UNIV
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However, the high cost of the design has become an obstacle to the commercialization of SOFC technology, so there is a need to develop high-quality materials in order to design more economically feasible systems
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Embodiment 1
[0027] A preparation method of an apatite type composite solid electrolyte ceramic sheet, the steps are as follows:
[0028] ①, according to the target sample Ba x / 3 La 10-x / 3 Si 6-y Ti y o 27±δ The stoichiometric ratio of La(NO 3 ) 3 ·6H 2 O, Ba(NO 3 ) 2 、C 8 h 20 o 4 Si, C 16 h 36 o 4 Ti, add 100ml of distilled water, then add citric acid and ethylene glycol.
[0029] There are a total of 10 groups in the experiment, corresponding to the two cases where y is taken from 0 and 0.5, and x is taken from 0, 1, 2, 3 and 4 respectively. For each set of experiments, the molar mass of citric acid was 1.5 times the amount of metal ions contained in the components, and the weight of ethylene glycol was 1.2 times the weight of citric acid.
[0030] ②. Stir continuously with a glass rod to fully dissolve the solid particles in the solution, then add an appropriate amount of ammonia water to adjust the pH value to 4-6.
[0031]③. Put the prepared solution in an ultrasonic...
Embodiment 2
[0038] Ba x / 3 La 10-x / 3 Si 6-y Ti y o 27±δ Performance Characterization of Electrolyte Powder and Ceramic Sheet
[0039] In the preparation of Ba x / 3 La 10-x / 3 Si 6-y Ti y o 27±δ After the electrolyte powder and ceramic sheets, samples are required for analysis. In the process of experimental preparation, a part of the powder needs to be reserved before firing the ceramic sheet to test the XRD data, infrared spectrum and thermogravimetric analysis. Part of the fired ceramic sheet is used for SEM scanning electron microscope analysis, and the other part of the ceramic sheet is used to test the impedance after silver plating. It should be noted that the silver plating on the side of the ceramic sheet needs to be ground with sandpaper before measuring the impedance. avoid short circuit
[0040] 1. SEM test analysis
[0041] After the preparation of the test sample is completed, various performance tests are started, among which the scanning electron microscope (SEM) t...
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Abstract
The invention discloses a method for preparing apatite type composite solid electrolyte ceramic material by an ultrasonic-assisted sol-gel method, and relates to the technical field of preparation ofsolid electrolyte ceramic materials. The method comprises the following steps: weighing La(NO3)3.6H2O, Ba(NO3)2, C8H20O4Si, C16H36O4Ti, distilled water, citric acid and ethylene glycol; stirring to sufficiently dissolve the solid particles, and dropwise adding ammonia water to adjust the pH value; putting the blended solution in an ultrasonic cleaning machine to uniformly mix the solution under ultrasound, then transferring the solution onto a digital display heat collecting type magnetic stirrer, and stirring till a gel forms; taking out the stirred gel and drying in a drying oven; then taking out the dried gel, grinding and pre-sintering in a muffle furnace. Due to the doping of the metal elements barium and titanium, the sinterability of apatite electrolyte is improved, and densification sintering of the electrolyte can be realized at 1,500 DEG C.
Description
technical field [0001] The invention relates to the technical field of preparation of solid electrolyte ceramic materials, in particular to a method for preparing an apatite-type composite solid electrolyte ceramic material by an ultrasonic-assisted sol-gel method. Background technique [0002] The essence of Solid Oxide Fuel Cells (SOFCs) is to convert the chemical energy that is difficult to use or the chemical energy that is very inefficient in fuel into electrical energy that people can use conveniently. The interior of a solid fuel cell is made up of many small batteries connected together. The main structure of each small battery is a cathode, an anode, a click separator, an electrolyte, and a connector. In solid oxide fuel cells, the most important thing is the electrolyte, most of which are made of oxide ceramics, which generally have excellent electrical properties. In SOFCs, the electrolyte is very important because it is used as a channel to connect the electrod...
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