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Method for preparing metallic element doped La2Mo2O9 solid electrolyte

A solid electrolyte, la2mo2o9 technology, applied in circuits, fuel cells, electrical components, etc., can solve problems such as phase transitions

Active Publication Date: 2019-05-03
HEFEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] A large amount of data shows that lanthanum molybdate with a special structure can have oxygen vacancies even if it is not doped with other elements, and its conductivity is higher than that of YSZ. In addition, its preparation process is relatively simple and the price of raw materials is relatively low. However, There is also a big disadvantage, high temperature is capable of phase change

Method used

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  • Method for preparing metallic element doped La2Mo2O9 solid electrolyte
  • Method for preparing metallic element doped La2Mo2O9 solid electrolyte
  • Method for preparing metallic element doped La2Mo2O9 solid electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (La 1-x Pb x ) 2 Mo 2 o 9-δ The preparation method of solid electrolyte, the steps are as follows:

[0035] ① There are 4 groups in the experiment, and x is taken from 0, 0.2, 0.4, 0.6 respectively. According to the target sample (La 1-x Pb x ) 2 Mo 2 o 9-δ The stoichiometric ratio of La(NO 3 ) 3 ·6H 2 O, (NH 4 ) 6 Mo 7 o 24 4H 2 O, Pb(NO 3 ) 2 In a beaker, add an appropriate amount of distilled water and stir to dissolve.

[0036] ②, then add citric acid to the beaker (the molar amount of citric acid is 1.5 times the amount of metal ions contained in the components), and adjust the pH value to neutral with ammonia water, transfer to CS-BA type digital display ultrasonic water bath for oscillation Ultrasonic in the container for 1h, after uniform dispersion, put into WBFY201 microwave chemical reactor at 80°C for 2h microwave reaction, and evaporate to obtain wet gel.

[0037] ③. Put the obtained wet gel sample into a drying oven and dry it at 120°C...

Embodiment 2

[0041] (La 1-x Pb x ) 2 Mo 2 o 9-δ Performance Characterization of Solid Electrolyte

[0042] 1. Characterization method

[0043] 1.1. Principle of XRD test method

[0044] XRD pattern analysis is a very common material analysis method. It uses the diffraction of X-rays received by the sample to produce different absorption peaks. a research tool. The powder obtained after calcination at different temperatures was tested by X-ray diffraction (XRD). The test parameters used in this experiment were the wavelength (λ) of 0.1542nm, the scan rate (V) of 35 / min, and the scan range (2θ) of 5 °~80°. XRD analysis is based on the characteristic that X-rays have specific energies for different elements. After drawing them into spectra with oring software, the corresponding elements can be found according to the magnitude of different energies.

[0045] 1.2. Principle of SEM-EDS test method

[0046] The SEM-EDS combination is the most widely used microscopic analysis instrument ...

Embodiment 3

[0092] (La 1-x Ti x ) 2 Mo 2 o 9-δ The preparation method of solid electrolyte, the steps are as follows:

[0093] ① There are 3 groups in the experiment, and x is taken from 0.2, 0.3, and 0.4 respectively. According to the target sample (La 1-x Ti x ) 2 Mo 2 o 9-δ The stoichiometric ratio of La(NO 3 ) 3 ·6H 2 O, (NH 4 ) 6 Mo 7 o 24 4H 2 O. Put tetrabutyl titanate in a beaker, add appropriate amount of distilled water and fully stir to dissolve.

[0094] ②, then add citric acid to the beaker (the molar amount of citric acid is 1.5 times the amount of metal ions contained in the components), and adjust the pH value to neutral with ammonia water, transfer to CS-BA type digital display ultrasonic water bath for oscillation Ultrasonic in the container for 1h, after uniform dispersion, put into WBFY201 microwave chemical reactor at 80°C for 2h microwave reaction, and evaporate to obtain wet gel.

[0095] ③. Put the obtained wet gel sample into a drying oven and d...

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Abstract

The invention relates to a method for preparing a metallic element doped La2Mo2O9 solid electrolyte and relates to the technical field of solid electrolyte preparation. The method comprises firstly dissolving La(NO3)3.6H2O, (NH4)6Mo7O24.4H2O, Pb(NO3)2 or tetrabutyl titanate in distilled water; then adding citric acid and adjusting the pH value of the system; performing uniform dispersion by an ultrasonic cleaner; transferring the mixture to a microwave chemical reactor, heating the mixture to form wet gel; finally, drying, calcining and sintering the wet gel. The lanthanum molybdate matrix Lais doped with Pb2+. Ti4+ can not only inhibit the [alpha] / [beta] phase transition of the matrix, but also increases the oxygen vacancies in the crystal structure and improves the conductivity. The electrolyte has good ionic conductivity, low conductance activation energy, and high sintering activity. The maximum conductivity is 0.0253S / cm and the conductance activation energy is 1.312eV at 800 degrees centigrade.

Description

technical field [0001] The invention relates to the technical field of solid electrolyte preparation, in particular to a metal element doped La 2 Mo 2 o 9 Preparation method of solid electrolyte. Background technique [0002] Solid oxide fuel cell (SOFC) has become a research hotspot in the field of new energy due to its unique all-solid structure, high energy conversion efficiency, environmental friendliness, reliability, wide range of fuel use, low loss, and long life. Traditional SOFC has a high operating temperature (800-1000°C) and has high requirements on the performance of related materials, which limits the development and application of SOFC. Therefore, the development of medium and low temperature SOFC has become an inevitable trend. Solid electrolyte materials are the key components of SOFCs, so the development of high-conductivity electrolyte materials is crucial to the development and application of SOFCs. [0003] With the increasingly serious energy shorta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1246
CPCY02E60/50
Inventor 阳杰田长安张霞王敬泽王辰云蒙雯廖文浩杜慧慧吴涵
Owner HEFEI UNIV
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