A kind of hollow structure spinel type mesoporous high entropy oxide nanosphere and its preparation method and application
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A spinel type, hollow structure technology, applied in the field of nanomaterials, to achieve the effect of controlling cost input and wide application value
Active Publication Date: 2021-01-19
XI AN JIAOTONG UNIV
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However, no high-entropy oxide hollow spheres with mesoporous structures have been reported so far.
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[0039] The spinel-type mesoporous high-entropy oxide (NiCoCrFeMn) with a hollow structure provided by the present invention 3 o 4 Nanosphere and preparation method, concrete steps are as follows:
[0040] (1) In a weakly alkaline water / alcohol mixed solvent, plant polyphenol tannic acid is used as an organic ligand, and Pluronic F127 is used to control the morphology. First, formaldehyde covalently cross-links tannic acid to form tannin acid-formaldehyde oligomer, then Ni 2+ 、Co 2+ 、Cr 3+ , Fe 2+ , Mn 2+ Aqueous solution of nickel(II)-cobalt(II)-chromium(III)-iron(II)-manganese(II)-tannic acid-formaldehyde polymer nanospheres.
[0041] (2) With the prepared nickel (II)-cobalt (II)-chromium (III)-iron (II)-manganese (II)-tannic acid-formaldehyde polymer nanospheres as a precursor, in an air atmosphere for 600 ℃ roasting 1-3h in the system.
Embodiment 1
[0043] Mesoporous High Entropy Oxides (NiCoCrFeMn) 3 o 4 Synthesis of hollow nanospheres:
[0044] (1) Dissolve 0.20g Pluronic F127 in 38mL H 2 0 and 8 mL of absolute ethanol, after completely dissolving, add 0.35 mL of ammonia water (25 wt %), stir for about 1 h, then add 8 mL of tannic acid aqueous solution (containing 0.20 g of tannic acid) and 0.38 mL of formaldehyde solution (37 to 40 wt %) , Continue stirring for 12h, covalent cross-linking reaction occurs, and tannic acid-formaldehyde oligomer is obtained.
[0045] (2) Add 2 mL of freshly prepared Ni(NO 3 ) 2 , Co(NO 3 ) 2 , CrCl 3 , FeSO 4 , MnSO 4 For the mixed solution, the molar concentration of the metal salt is 0.069mM, and the corresponding masses are 0.02g, 0.02g, 0.018g, 0.02g, and 0.012g, respectively. After stirring for 12h, the resulting mixture was transferred to a 100mL reaction kettle, heated in an oven at 100°C for 12h, and then the hydrothermal product was collected by centrifugation, and furt...
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Abstract
The invention discloses a spinel type mesoporous high-entropy oxide (NiCoCrFeMn)3O4 nanosphere with a hollow structure, a preparation method and application thereof, and belongs to the technical fieldof advanced nano materials. The preparation method comprises: carrying out a covalent cross-linking reaction on formaldehyde and tannic acid in weakly alkaline water / alcohol mixed solvent by using pluronic F127 to control morphology, using the tannic acid as an organic ligand and using the formaldehyde as a cross-linking agent to prepare a tannic acid-formaldehyde oligomer; then carrying out a hydrothermal reaction on a metal precursor containing equimolar Ni<2+>, Co<2+>, Cr<3+>, Fe<2+> and Mn<2+> and the prepared tannic acid-formaldehyde oligomer to obtain nickel (II)-cobalt (II)-chromium (III)-iron (II)-manganese (II)-tannic acid-formaldehyde polymer nanospheres; and roasting in an air atmosphere to obtain the spinel type mesoporous high-entropy oxide (NiCoCrFeMn)3O4 nanosphere with thehollow structure. The prepared mesoporous high-entropy oxide (NiCoCrFeMn)3O4 nanosphere has a hollow structure, a high specific surface area, a large pore volume and superparamagnetism, so that the mesoporous high-entropy oxide (NiCoCrFeMn)3O4 nanosphere can be applied to the aspects of catalysis, separation, electrode materials and the like.
Description
technical field [0001] The invention belongs to the field of nanometer materials, and relates to a spinel-type mesoporous high-entropy oxide (NiCoCrFeMn) with a hollow structure 3 o 4 Nanospheres and their preparation methods and applications. Background technique [0002] High-entropy oxides are multi-principal solid solutions composed of five or more equimolar oxides. Due to their unique "high-entropy effect" and excellent mechanical, electrical, magnetic and thermal properties, they are widely used in lithium-ion batteries, coatings, etc. Layer materials, catalysis and other fields show broad application prospects. In recent years, a lot of progress has been made in the synthesis of high-entropy oxides, and rock-salt-type high-entropy oxides (Mg 0.2 Ni 0.2 co 0.2 Cu 0.2 Zn 0.2 )O, fluorite-type high-entropy oxides ((Ce 0.2 La 0.2 SM 0.2 PR 0.2 Y 0.2 )O 2 ), perovskite high-entropy oxides ((Gd 0.2 La 0.2 Nd 0.2 SM 0.2 Y 0.2 )MnO 3 ) and spinel high-entro...
Claims
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