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Cerium-oxide matrix doped dysprosium-oxide composite electrolyte material and preparation method thereof

A composite electrolyte, dysprosium oxide technology, applied in circuits, fuel cells, electrical components, etc., can solve problems such as inability to be used as electrolyte materials, and achieve the effects of increasing ionic conductivity and activation energy, easy operation, and simple preparation methods

Inactive Publication Date: 2019-05-10
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Both cerium oxide and zirconia have a fluorite structure. The difference is that the crystal form of the cerium oxide structure does not change with temperature, but pure cerium oxide grains are non-conductive phases at the nanometer level and cannot be used as electrolyte materials; in addition, currently Dy 2 o 3 It is widely used in luminescent materials, and there are few reports on its application in electrolyte materials

Method used

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  • Cerium-oxide matrix doped dysprosium-oxide composite electrolyte material and preparation method thereof
  • Cerium-oxide matrix doped dysprosium-oxide composite electrolyte material and preparation method thereof
  • Cerium-oxide matrix doped dysprosium-oxide composite electrolyte material and preparation method thereof

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preparation example Construction

[0037] The invention provides a preparation method of a cerium oxide matrix-doped dysprosium oxide composite electrolyte material, comprising the following steps:

[0038] (1) Dysprosium oxide is dissolved with dilute nitric acid to obtain a dysprosium oxide solution;

[0039] Dissolving cerium nitrate, citric acid and ammonium nitrate in water respectively to obtain cerium nitrate solution, citric acid solution and ammonium nitrate solution;

[0040] Dissolving ethylenediaminetetraacetic acid with aqueous ammonia to obtain an ethylenediaminetetraacetic acid solution;

[0041] (2) After mixing the dysprosium oxide solution, cerium nitrate solution, citric acid solution, ammonium nitrate solution and ethylenediaminetetraacetic acid solution, adjust the pH value to 7-8 to obtain a mixed solution;

[0042] (3) heat-insulating the mixed solution to obtain a gel;

[0043] (4) pre-igniting the gel to obtain a precursor;

[0044] (5) Carrying out the first roasting of the precurso...

Embodiment 1

[0060] (1) Dissolve dysprosium oxide, cerium nitrate hexahydrate, citric acid, ammonium nitrate, and ethylenediaminetetraacetic acid (EDTA) with dilute nitric acid, deionized water, deionized water, deionized water, and dilute ammonia water respectively, and filter and mix well ;

[0061] Among them, citric acid, EDTA, ammonium nitrate, metal cation (Dy 3+ +Ce 4+ ) in a molar ratio of 1.2:1:1.5:1; in terms of oxide content, the molar ratio of dysprosium oxide and cerium nitrate is 0.05:0.95;

[0062] The concentration of dilute nitric acid is 4mol / L, the concentration of ammonia water is 25%,

[0063] (2) After mixing the solutions in step (1), carry out neutralization titration with dilute ammonia water at room temperature until the pH value of the mixed solution is 7 to 8;

[0064] (3) Put the mixed solution of step (2) into a 75°C constant temperature water bath to keep warm, and stir until a yellow gel is formed;

[0065] (4) Put the obtained gel into a crucible, and p...

Embodiment 2～6

[0071] The other steps are the same as in Example 1, only the molar ratios of dysprosium oxide and cerium nitrate in steps (1) of Examples 2 to 6 are respectively controlled successively as: 0.1:0.9, 0.15:0.85, 0.2:0.8, 0.25:0.75, 0.3 : 0.7, Examples 2-6 respectively obtain the cerium oxide matrix doped dysprosium oxide composite electrolyte material with dysprosium oxide doping amount of 10%, 15%, 20%, 25%, and 30%.

[0072] The composite electrolyte material obtained in Examples 1-6 is characterized:

[0073] (1) figure 1 It is the XRD spectrogram of the composite electrolyte powder obtained in step (6) in Examples 1 to 6, and Table 1 is the unit cell parameter table of the composite electrolyte powder obtained in step (6); wherein 1#, 2#, 3#, 4 #, 5#, and 6# represent the composite electrolyte materials obtained in Examples 1-6, respectively. according to figure 1 It can be seen that the 8 diffraction peaks of the XRD spectrum line are consistent with the cubic fluorite ...

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Abstract

The invention provides a a preparation method of a cerium-oxide matrix doped dysprosium-oxide composite electrolyte material, which comprises the steps of: firstly, preparing composite electrolyte powder of cerium oxide and dysprosium oxide; and then by grinding, tabletting and roasting, obtaining the cerium-oxide matrix doped dysprosium-oxide composite electrolyte material. According to the invention, by doping the dysprosium oxide into a cerium-oxide matrix, oxygen vacancies are introduced into an electrolyte crystal structure, and ionic conductivity and activation energy of the electrolytematerial are improved; and the preparation method provided by the invention is simple and easy to operate.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a cerium oxide matrix-doped dysprosium oxide composite electrolyte material and a preparation method thereof. Background technique [0002] Solid Oxide Fuel Cell (SOFC) has attracted the most attention among fuel cells. Its biggest feature is that the battery components are all solid structures, which avoids the corrosion and sealing problems of liquid electrolytes; and the energy conversion rate is as high as 50% to 60%. The medium and high temperature operation speeds up the reaction rate of the battery, does not need to use precious metals as catalysts, and can also achieve cogeneration of heat and power. [0003] As the core material of SOFC, electrolytes mainly include fluorite-type electrolytes and perovskite-type electrolytes. Among them, the zirconia-based electrolyte with a fluorite structure has many excellent properties, but it is only suitable for operation at hig...

Claims

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Application Information

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IPC IPC(8): H01M8/126H01M8/124H01M8/1246
CPCY02E60/50
Inventor 彭军薛优刘丽霞张芳刘媛媛彭继华安胜利宋希文
Owner INNER MONGOLIA UNIV OF SCI & TECH
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