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Novel B-site five-membered high-entropy perovskite type oxide material and preparation method thereof

A perovskite-type and oxide technology, which is applied in chemical instruments and methods, nickel compounds, cobalt compounds, etc., can solve problems such as perovskite-type high-entropy oxides that have not yet been retrieved, and achieve easy regulation, convenient operation, The effect of high specific surface area

Inactive Publication Date: 2019-11-19
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are no relevant reports on this series of perovskite-type high-entropy oxides, especially perovskite-type nanocrystalline powders.

Method used

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  • Novel B-site five-membered high-entropy perovskite type oxide material and preparation method thereof
  • Novel B-site five-membered high-entropy perovskite type oxide material and preparation method thereof
  • Novel B-site five-membered high-entropy perovskite type oxide material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A new type of perovskite-type high-entropy oxide powder with B-site five-element high-entropy was prepared by solution combustion method. The chemical composition of the high-entropy oxide powder is La(Cr 0.2 Fe 0.2 mn 0.2 Ni 0.2 Zn 0.2 )O 3 : Take by weighing corresponding rare earth nitrate and metal nitrate according to the stoichiometric ratio of molecular formula, be specifically the La(NO of 4.330g 3 ) 3 .9H 2 O, 0.8004g of Cr(NO 3 ) 3 .9H 2 O, 0.808g of Fe(NO 3 ) 3 .9H 2 O, 0.574g of Mn(NO 3 ) 2 .4H 2 O, 0.582g of Ni(NO 3 ) 2 .6H 2 O and 0.595g of Zn(NO 3 ) 2 .6H 2 O, dissolved in 10mL distilled water, stirred evenly at room temperature to obtain a mixed solution containing one rare earth cation and five metal cations; then weighed 6.006g glycine and added to the mixed solution, stirred evenly; then put the above transparent sol Dry in an oven at 100°C to obtain a viscous gel after evaporating water; finally put the above gel in a muffle furn...

Embodiment 2

[0030] A new type of perovskite-type high-entropy oxide powder with B-site five-element high-entropy was prepared by solution combustion method. The chemical composition of the high-entropy oxide powder is Y(Cr 0.2 Fe 0.2 mn 0.2 Mg 0.2 Ni 0.2 )O 3 : Take by weighing corresponding rare earth nitrate and metal nitrate according to the stoichiometric ratio of molecular formula, specifically the Y(NO of 2.794g 3 ) 3 .nH 2 O, 0.8004g of Cr(NO 3 ) 3 .9H 2 O, 0.808g of Fe(NO 3 ) 3 .9H 2 O, 0.574g of Mn(NO 3 ) 2 .4H 2 O, 0.513gMg(NO 3 ) 2 .6H 2 O and 0.582g of Ni(NO 3 ) 2 .6H 2 O, dissolved in 10mL distilled water, stirred evenly at room temperature to obtain a mixed solution containing a rare earth cation and six metal cations; then weighed 6.004g of tartaric acid and added it to the mixed solution, stirred evenly; then put the above transparent sol Dry in an oven at 100°C to obtain a viscous gel after evaporating water; finally put the above gel in a gold furnac...

Embodiment 3

[0032] A new type of perovskite-type high-entropy oxide powder with B-site five-element high-entropy was prepared by solution combustion method. The chemical composition of the high-entropy oxide powder is Pr(Cr 0.2 Fe 0.2 mn 0.2 co 0.2 Zn 0.2 )O 3 : Take by weighing corresponding rare earth nitrate and metal nitrate according to the stoichiometric ratio of molecular formula, specifically 3.269g of Pr(NO 3 ) 3 .9H 2 O, 0.8004g of Cr(NO 3 ) 3 .9H 2 O, 0.808g of Fe(NO 3 ) 3 .9H 2 O, 0.574g of Mn(NO 3 ) 2 .4H 2 O, 0.582g of Co(NO 3 ) 2 .6H 2 O and 0.595g of Zn(NO 3 ) 2 .6H 2 O, dissolved in 8mL distilled water, stirred evenly at room temperature to obtain a mixed solution containing a rare earth cation and six metal cations; then weighed 1.921g of citric acid and added to the mixed solution, stirred evenly; then the above transparent sol Dry in an oven at 150°C to obtain a viscous gel after evaporating water; finally place the above gel in a muffle furnace an...

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Abstract

The invention discloses a novel B-site five-membered high-entropy perovskite type oxide material and a preparation method thereof. The chemical formula of the high-entropy perovskite type oxide material is RE(Cr<0.2>Fe<0.2>Mn<0.2>M<0.2>N<0.2>)O<3>, wherein RE is one selected from the group consisting of La<3+>, Pr<3+>, Nd<3+>, Sm<3+>, Gd<3+> and Y<3+>; and M and N are any two selected from the divalent cations consisting of Co<2+>, Ni<2+>, Mg<2+> and Zn<2+>, but do not contain Co<2+> and Ni<2+> at the same time. According to the invention, the porous perovskite type high-entropy oxide nanocrystalline powder material with a high specific surface area, uniform chemical composition and a microstructure can be controllably prepared by adopting the solution combustion synthesis method; the high-entropy oxide material with a perovskite structure is designed by changing the composition of B-site cations in perovskite, so the physical and chemical properties of the high-entropy oxide materialare customized; and the preparation method is convenient to operate, high in practicability and convenient to promote.

Description

technical field [0001] The invention relates to the field of high-entropy oxide materials, in particular to a novel perovskite-type high-entropy oxide material with B-position five-element high-entropy and a preparation method. Background technique [0002] Perovskite oxide, the molecular formula is ABO 3 , where the A-site cations have a 12-coordination structure and are located at 12 vertices of the cubic unit cell, the B-site cations have a 6-coordination structure and are located at the body-centered position of the cubic unit cell, and O ions are located at 6 face-centered positions. Due to the compositional diversity and unique crystal structure of perovskite oxides, they have certain advantages in terms of thermal stability, chemical stability and structural stability, especially nano-scale perovskite oxides, which are widely used as catalytic materials (photocatalysis, chemical catalysis and electrochemical catalysis, etc.), solid oxide fuel cell cathode materials, ...

Claims

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Application Information

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IPC IPC(8): C01G53/00C01G51/00B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G51/006C01G53/006C01P2002/34C01P2002/72C01P2004/03C01P2004/64C01P2006/12
Inventor 冒爱琴谢鸿翔项厚政俞海云郑翠红林娜
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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