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A kind of cobalt nickel oxide/tin dioxide composite nanotube and its preparation method and application

A technology of tin dioxide and cobalt-nickel oxide, applied in the direction of hybrid capacitor electrodes, structural parts, inorganic raw material artificial filaments, etc., can solve the problems of low conductivity, low specific surface area, volume expansion limitation, etc., and achieve easy operation and preparation. The process is simple and the effect of easy reunion is solved

Active Publication Date: 2020-06-09
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although MTMO has many advantages, its shortcomings such as low conductivity, low specific surface area, and large volume expansion during charge and discharge limit its capacitive performance and ORR catalytic activity.

Method used

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  • A kind of cobalt nickel oxide/tin dioxide composite nanotube and its preparation method and application
  • A kind of cobalt nickel oxide/tin dioxide composite nanotube and its preparation method and application
  • A kind of cobalt nickel oxide/tin dioxide composite nanotube and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] This embodiment includes the following steps:

[0036] Weigh 1g of polyvinylpyrrolidone powder and add it into a mixed solvent of 5mL of ethanol + 5mL of deionized water, and stir at a high speed for 7 hours under heating in an oil bath at 80°C to obtain a clear polyvinylpyrrolidone solution. Then, 1 g of tin dichloride powder was added to the above solution, and the mixture was stirred for 5 hours under an oil bath to obtain a milky white spinning solution. Electrospinning was performed on the above mixed spinning solution, and the spinning parameters were set as follows: flow rate 0.3 mm / min, voltage 20 kV, receiving distance 15 cm. The prepared tin dichloride-polyvinylpyrrolidone nanofibers were finally deposited on the roller receiver in the form of nanofiber films, and the fiber films were peeled off and stored in a vacuum oven for 12 hours to remove residual solvents. The dried tin dichloride / polyvinylpyrrolidone fiber membrane was transferred to a muffle furnace...

Embodiment 2

[0042] This embodiment includes the following steps:

[0043]Prepare 4mM nickel nitrate aqueous solution and 8mM cobalt nitrate aqueous solution respectively, take 50mL of the above solutions and mix them, weigh 30mg of tin dioxide nanotube powder and a certain amount of urea and add them to the above mixed solution, and after ultrasonic mixing for 30s, the The dispersion was placed in a water bath at 80°C and reacted for 12 hours under magnetic stirring. After the reaction was completed, the dispersion was left to stand for 24 hours, the supernatant was poured, and the gray cobalt-nickel oxide precursor / tin dioxide composite nanotube was separated by centrifugation, and the product was dried in an oven at 70°C for use.

[0044] The dried cobalt-nickel oxide precursor / tin dioxide composite nanotubes were transferred to a programmable temperature-controlled tube furnace, and in a nitrogen atmosphere, the temperature was raised to 250°C at a rate of 1°C / min and kept for 1.5h, an...

Embodiment 3

[0046] This embodiment includes the following steps:

[0047] Prepare 4mM nickel nitrate aqueous solution and 8mM cobalt nitrate aqueous solution respectively, take 50mL of the above solutions and mix them, weigh a certain amount of urea and add it to the above mixed solution and wait for it to completely dissolve, place the mixed solution in a water bath at 80°C. The reaction was performed under magnetic stirring for 12 h. After the reaction was completed, the dispersion was left to stand for 24 hours, the supernatant was poured, and the white cobalt-nickel oxide precursor was separated by centrifugation. The product was dried in an oven at 70°C, and then transferred to a programmable temperature-controlled tube furnace. , under a nitrogen atmosphere, the temperature was raised to 250°C at a rate of 1°C / min and maintained for 1.5h, and pure cobalt-nickel oxide powder was obtained after natural cooling.

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Abstract

The invention provides a cobalt-nickel oxide / tin dioxide composite nanotube as well as a preparation method and use thereof. The preparation method comprises the following steps: (1) preparing a spinning solution; (2) preparing precursor nanofiber by virtue of an electrostatic spinning; (3) carrying out high-temperature calcination on the precursor nanofiber so as to obtain a tin dioxide nanotube; (4) preparing a mixed solution, with a certain concentration, of nickel salt and cobalt salt; (5) adding the tin dioxide nanotube obtained in the step (3) into the mixed solution obtained in the step (4), adding a pH aid, carrying out solution codeposition reaction at a certain temperature, so as to obtain a cobalt-nickel oxide precursor-tin dioxide composite nanotube; and (6) carrying out temperature-control annealing treatment in a certain atmosphere, so as to convert the cobalt-nickel oxide precursor-tin dioxide composite nanotube obtained in the step (5) into the cobalt-nickel oxide / tin dioxide composite nanotube. The preparation method is simple in process and easy in operation, and adopted polymers and reagents are cheap and environment-friendly.

Description

technical field [0001] The invention belongs to the field of functionalized hollow nanometer materials, in particular to a cobalt nickel oxide / tin dioxide composite nanotube and its preparation method and application. Background technique [0002] Recently, a new class of energy storage materials—Mixed transition-metal oxides (MTMOs) have been developed because of their extraordinary potential in energy storage and conversion applications, such as excellent electrochemical activity, low cost, and environmental protection. Because of their friendliness and other advantages, they have become the focus of researchers all over the world. In general, the general formula of MTMO can be expressed as A x B 3-x o 4 (A, B = Co, Ni, Zn, Mn, Fe, etc.), which may be a stoichiometric composition or a non-stoichiometric composition. At the same time, multivalent MTMO has rich chemical composition, which can provide reversible oxygen adsorption / desorption chemical sites for efficient ox...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/08H01G11/46H01M4/52H01M4/36C25B1/02C25B11/06
CPCC25B1/02C25B11/04D01F9/08H01G11/46H01M4/362H01M4/52Y02E60/10
Inventor 黄云鹏袁寿其李华明崔芬赵岩包健
Owner JIANGSU UNIV
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