Spinel type mesoporous high-entropy oxide nanosphere with hollow structure, preparation method and application thereof
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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: 2020-06-26
XI AN JIAOTONG UNIV
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However, no high-entropy oxide hollow spheres wit
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[0039] Spinel type mesoporous high-entropy oxide (NiCoCrFeMn) with hollow structure provided by the invention 3 O 4 Nanospheres and preparation methods, the specific steps are as follows:
[0040] (1) In a weakly alkaline water / alcohol mixed solvent, plant polyphenol tannic acid is used as the organic ligand. Pluronic F127 is used to control the morphology. First, formaldehyde is covalently cross-linked to form tannins. Acid-formaldehyde oligomer, then add Ni 2+ , Co 2+ , Cr 3+ , Fe 2+ , Mn 2+ The aqueous solution of nickel(II)-cobalt(II)-chromium(III)-iron(II)-manganese(II)-tannic acid-formaldehyde polymer nanospheres are formed.
[0041] (2) Take the prepared nickel(II)-cobalt(II)-chromium(III)-iron(II)-manganese(II)-tannic acid-formaldehyde polymer nanospheres as the precursor, and 600 Calcined at ℃ for 1-3h.
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[0042] Example 1
[0043] Mesoporous high-entropy oxide (NiCoCrFeMn) 3 O 4 Synthesis of hollow nanospheres:
[0044] (1) Dissolve 0.20g pluronic F127 in 38mL H 2 O and 8mL of absolute ethanol, add 0.35mL of ammonia (25wt%) after complete dissolution, stir for about 1h and then add 8mL of tannic acid aqueous solution (containing 0.20g of tannic acid) and 0.38mL of formaldehyde solution (37~40wt%) , Continue to stir for 12 hours, a covalent cross-linking reaction occurs, and tannic acid-formaldehyde oligomer is prepared.
[0045] (2) Add 2 mL of freshly prepared Ni(NO) to the tannin-formaldehyde oligomer 3 ) 2 , Co(NO 3 ) 2 , CrCl 3 , FeSO 4 , MnSO 4 In 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, 0.012g, respectively. After stirring for 12 hours, the resulting mixture was transferred to a 100 mL reactor, and hydrothermally heated in an oven at 100°C for 12 hours, then centrifuged to collect the...
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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 nano materials, and relates to a spinel-type mesoporous high-entropy oxide (NiCoCrFeMn) with a hollow structure 3 O 4 Nanosphere and its preparation method and application. Background technique [0002] High-entropy oxide is a multi-principal solid solution composed of 5 or more equimolar oxides. Due to its unique "high entropy effect" and excellent mechanical, electrical, magnetic and thermal properties, it is used in lithium ion batteries, coatings Layer materials, catalysis and other fields show a wide range of application prospects. In recent years, a lot of progress has been made in the synthesis of high-entropy oxides. There are currently 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 oxide ((Ce 0.2 La 0.2 Sm 0.2 Pr 0.2 Y 0.2 )O 2 ), perovskite-type high-entropy oxide ((Gd 0.2 La 0.2 Nd 0.2 Sm 0.2 Y 0.2 )MnO 3 ) And spinel type high-entropy oxide ((NiCoCrFeMn)...
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