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Spinel-structure-based high-entropy ceramic material as well as preparation method and application thereof

A spinel structure, ceramic material technology, applied in structural parts, electrical components, battery electrodes, etc., can solve problems such as sparse reports and unclear scientific issues, and achieve cogeneration, high energy conversion efficiency, and battery performance. stable effect

Active Publication Date: 2021-12-03
NANHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Many researchers have proposed the use of high-entropy perovskite oxides as cathodes for traditional oxygen ion conductor solid oxidation fuel cells (O-SOFCs), but the research on applying high-entropy oxides to proton conductor SOFCs has just begun. Reports in this area are very sparse, so many scientific questions in the structure-property relationship remain unclear
In addition, high-entropy ceramic materials have not been used as cathodes in proton conductor solid oxide fuel cells in existing studies

Method used

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  • Spinel-structure-based high-entropy ceramic material as well as preparation method and application thereof
  • Spinel-structure-based high-entropy ceramic material as well as preparation method and application thereof
  • Spinel-structure-based high-entropy ceramic material as well as preparation method and application thereof

Examples

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preparation example Construction

[0035] A method for preparing the above-described high-entropy ceramic material based on spinel structure, comprising the following steps:

[0036] S1. Press MnCo x (Ca y Cr y Fe y Ni y Zn y )O 4 The stoichiometric ratio of the chemical reaction is used to prepare the metal salt solution, and then the complexing agent is added according to the preset molar ratio, the pH value is adjusted to 7-8, and the water is gradually evaporated by heating to obtain the precursor;

[0037] Specifically will (CH 3 COO) 2 Mn, Co(NO 3 ) 3 , CaCO 3 (Add a certain amount of nitric acid to dissolve), Cr(NO 3 ) 3 , Fe(NO 3 ) 3 , Ni(NO 3 ) 2 , Zn(NO 3 ) 2 by MnCo 1.8 (Ca 0.04 Cr 0.04 Fe 0.04 Ni 0.04 Zn 0.04 )O 4 The stoichiometric ratio was dissolved in deionized water, and citric acid and ethylenediaminetetraacetic acid were added as complexing agents according to 1.5 times and 1 times the molar weight of metal ions, and ammonia water was added to adjust the pH value to 7...

Embodiment 1-5

[0042] The chemical formula of the high-entropy ceramic material based on the spinel structure provided by Examples 1-5 is MnCo 1.8 (Ca 0.04 Cr 0.04 Fe 0.04 Ni 0.04 Zn 0.04 )O 4 , prepared by:

[0043] Will (CH 3 COO) 2 Mn, Co(NO 3 ) 3 , CaCO 3 , Cr(NO 3 ) 3 , Fe(NO 3 ) 3 , Ni(NO 3 ) 2 , Zn(NO 3 ) 2 by MnCo 1.8 (Ca 0.04 Cr 0.04 Fe 0.04 Ni 0.04 Zn 0.04 )O 4 The stoichiometric ratio is added to the deionized aqueous solution in sequence; then, citric acid is added according to 1.5 times the molar weight of metal ions, ethylenediaminetetraacetic acid is added in an amount of 1 times the molar weight of metal ions, ammonia water is added, and the pH value is adjusted to 7-8 , keep the aqueous solution clear. Heat it on a magnetic stirrer to evaporate the moisture, continue to heat after evaporation to make it gel and gradually generate a precursor; then respectively at 800°C (Example 1), 850°C (Example 2), 900°C ℃ (embodiment 3), 950 ℃ (embodiment 4), 10...

Embodiment 6

[0047] The novel high entropy ceramic material of the present embodiment, its concrete chemical composition is MnCo 1.8 (Ca 0.04 Cr 0.04 Fe 0.04 Ni 0.04 Zn 0.04 )O 4 , using it as the cathode, NiO-BCZY as the anode support, and BCZY as the electrolyte to form a full battery for electrochemical performance testing. Its assembly method is carried out according to the following steps:

[0048] (1) Fe(NO 3 ) 3 , (CH 3 COO) 2 Mn, Co(NO 3 ) 3 , CaCO 3 , Ni(NO 3 ) 2 , Cr(NO 3 ) 3 , Zn(NO 3 ) 2 by MnCo 1.8 (Ca 0.04 Cr 0.04 Fe 0.04 Ni 0.04 Zn 0.04 )O 4The stoichiometric ratio is mixed evenly, and citric acid and ethylenediaminetetraacetic acid are respectively added as complexing agents according to 1.5 times and 1 times the molar weight of metal ions, and then ammonia water is added to adjust the pH=7-8. After the solution was stirred for 5 h, it was heated on a magnetic stirrer and evaporated to dryness. After evaporation to dryness, it was heated continuous...

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Abstract

The invention provides a high-entropy ceramic material based on a spinel structure and a preparation method and application thereof. The preparation method comprises the steps that raw materials of a high-entropy ceramic compound and a complexing agent are mixed, a precursor is obtained through a sol-gel method under the weak alkaline condition, then nanoscale MnCox (CayCryFeyNiyZny) O4 high-entropy ceramic powder is generated through high-temperature calcination, and x and y meet the condition that x+5y=2. And the prepared half cell is coated with the calcined high-entropy ceramic powder to obtain the novel proton conductor solid oxide fuel cell. The nano-scale novel high-entropy ceramic powder obtained by the method disclosed by the invention is large in specific surface area and good in catalytic activity; the process method is good in repeatability, low in cost and easy to industrialize, the product can be used for assembling a battery reactor and efficiently converting gas fuel into electric energy, good electrochemical stability is achieved, and cogeneration can still be achieved in the efficient energy conversion process.

Description

technical field [0001] The invention relates to the technical field of high-entropy ceramic materials, in particular to a spinel-based high-entropy ceramic material and its preparation method and application. Background technique [0002] In the past few decades, researchers have proposed many cathode materials for H-SOFC (proton conductor based solid oxide fuel cells), and most cathode materials are based on perovskite or perovskite-related structure. Some of these cathode materials can show good performance for proton conductor solid oxide fuel cells. At the same time, compared with perovskite cathodes, spinel oxides have received less attention as cathodes for solid oxide fuel cells (SOFCs), but they have been widely used as coatings for SOFC interfaces. layer. [0003] In recent years, some spinel oxides have been used as cathodes of cation conductor solid oxide fuel cells, and good electrochemical performance can be obtained. These findings demonstrate that spinel o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/88
CPCH01M4/9025H01M4/88Y02E60/50
Inventor 许阳森毕磊
Owner NANHUA UNIV
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