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Cobalt-manganese-based spinel nano material as well as preparation method and application thereof

A technology of nanomaterials and spinel, which is applied in the field of preparation of spinel nanomaterials, can solve problems such as the inability to independently control the structure and chemical composition of cobalt manganese spinel, achieve rich defect active sites, low energy consumption, The effect of large specific surface area

Active Publication Date: 2015-07-29
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the structure and chemical composition of cobalt-manganese spinel cannot be independently controlled at room temperature, which brings great challenges to the controllable preparation of the material and the revealing of the structure-activity relationship between the physical and chemical properties and properties of the material.

Method used

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  • Cobalt-manganese-based spinel nano material as well as preparation method and application thereof
  • Cobalt-manganese-based spinel nano material as well as preparation method and application thereof
  • Cobalt-manganese-based spinel nano material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method of cobalt-manganese spinel nanomaterial, wherein the cobalt-manganese spinel nanomaterial is cubic phase CoMn 2 O 4 Nanoparticles, with an average particle size of 11nm and a molar ratio of Co to Mn of 1:2.12, including the following steps;

[0028] 1) Add 4mL of 14mol / L ammonia droplets to 5mL of 0.2mol / L Co(NO 3 ) 2 In the solution, stir for 120 min at room temperature under an air atmosphere to obtain a mixed solution a;

[0029] 2) Under magnetic stirring, add dropwise 10 mL of 0.2mol / L Mn(NO 3 ) 2 After the addition of the solution, continue to stir for 120 minutes to obtain a mixed solution b;

[0030] 3) Raise the temperature of the above-mentioned mixed liquid b to 180°C and keep it for 40 minutes, and then evaporate the solvent to completely decompose and crystallize the metal salts a and b, and prepare the cubic phase CoMn of the cobalt-manganese spinel nanomaterial 2 O 4 .

Embodiment 2

[0032] A method for preparing cobalt-manganese spinel nanomaterials, wherein the cobalt-manganese spinel nanomaterials are cubic phase Co 1.5 Mn 1.5 O 4 Nanoparticles, with an average particle size of 10nm, and a molar ratio of Co to Mn of 1.02:1. The preparation steps are basically the same as those in Example 1), except that: in step 1) Co(NO 3 ) 2 The concentration of the solution is 0.3mol / L, in step 2) Mn(NO 3 ) 2 The concentration of the solution is 0.15 mol / L.

Embodiment 3

[0034] A method for preparing cobalt-manganese spinel nanomaterials, wherein the cobalt-manganese spinel nanomaterials are cubic phase Co 2 MnO 4 Nanoparticles, with an average particle size of 9nm, and a molar ratio of Co to Mn of 2.03:1, and the preparation steps are basically the same as in Example 1), except that: in step 1) Co(NO 3 ) 2 The concentration of the solution is 0.4mol / L, in step 2) Mn(NO 3 ) 2 The concentration of the solution is 0.1 mol / L.

[0035] Co prepared in the above examples 1), 2), and 3) 3-x Mn x O 4 The XRD pattern of the nanoparticles is as figure 1 As shown, the cubic crystal form, the peak position and intensity are consistent with JCPDS standard card No.23-1237, the unit cell parameters calculated from the characteristic peaks in the spectrum are smaller than the standard value, indicating that it contains rich metal ions defect. The broadening of the diffraction peak is caused by the product being ultra-fine nanocrystalline grains. Transmission ele...

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Abstract

A cobalt-manganese-based spinel nano material has a general chemical formula: Co(3-x)MnxO4, wherein x is larger than or equal to 1 and smaller than or equal to 2. The cobalt-manganese-based spinel nano material comprises cubic phase nano-particles and tetragonal phase nano-particles, the sizes of the nano-particles range from 5 nm to 15 nm, and the mole ratio of Co to Mn is (0.4-2.2):1. The preparation method is as follows: a crystal phase and composition are controlled through oxidizing sedimentation and embedded crystallization at the air atmosphere under the normal pressure, so that the cobalt-manganese-based spinel nano material is obtained. The cobalt-manganese-based spinel nano material has the advantages as follows: the preparation method is simple, convenient and rapid, and energy consumption is lower under the mild condition; the prepared cobalt-manganese-based spinel is ultrafine nanocrystalline and has a large specific surface area, rich defect active sites and a porous structure; contact of gas-liquid-solid interfaces on the surface of an electrode is increased, a good conveying channel is provided for material conveying, the electrocatalytic activity of the cobalt-manganese-based spinel nano material is effectively improved, and the cobalt-manganese-based spinel nano material has a great significance in electrocatalysis of fuel cells, metal-air cells and the like.

Description

Technical field [0001] The invention relates to the preparation of a spinel nano material, in particular to a cobalt-manganese spinel nano material and a preparation method and application thereof. Background technique [0002] Spinel structure compound, chemical formula is AB 2 O 4 (A and B are metals) are an important class of inorganic functional materials. Due to a series of unique properties, they are widely used in many fields such as high temperature materials, magnetic materials, semiconductor optoelectronic materials, sensors and catalysis. [0003] The traditional method for preparing spinel composite oxide materials is mainly the high-temperature solid-phase reaction method, but this method requires long-term high-temperature calcination to overcome the energy barrier required for the reaction, which not only increases energy consumption, but also obtains products with larger size and easy Agglomeration, poor overall uniformity and small specific surface area, seriously ...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M4/9016H01M10/0525Y02E60/10Y02E60/50
Inventor 陈军程方益韩晓鹏李淳胡宇翔陈程成
Owner NANKAI UNIV
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