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Method for preparing manganese molybdate/cobalt molybdate hierarchical heterostructure nanowires

A technology of manganese molybdate nanometer and heterogeneous structure, which is applied in chemical instruments and methods, crystal growth, electrolytic capacitors, etc., and can solve problems such as inability to provide energy and power density, low specific capacitance of supercapacitors, and decline in specific capacitance , to achieve the effects of facilitating market promotion, reducing energy consumption, and simple methods

Active Publication Date: 2011-08-17
武汉经开科创运营有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these supercapacitors cannot provide sufficient energy and power density due to their low specific capacitance
In addition, since the specific capacitance of supercapacitors will decrease rapidly when working at high current densities, they can only work at low current densities, which also limits their applications.

Method used

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  • Method for preparing manganese molybdate/cobalt molybdate hierarchical heterostructure nanowires
  • Method for preparing manganese molybdate/cobalt molybdate hierarchical heterostructure nanowires
  • Method for preparing manganese molybdate/cobalt molybdate hierarchical heterostructure nanowires

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Embodiment 1

[0035] A method for preparing manganese molybdate / cobalt molybdate graded heterostructure nanowires, comprising the steps of:

[0036] 1) Prepare 0.5mol / L NaMoO 4 Aqueous solution and 0.5mol / L MnCl 2 Aqueous solution, NaMoO as prepared 4 Aqueous solution: MnCl 2 Aqueous solution: CTAB (cetyltrimethylammonium bromide): n-butanol: isooctane=1.39ml: 1.39ml: 1.56g: 1.6ml: 9ml ratio batching, join in the reactor, utilize microemulsion method, using a magnetic stirrer to stir for 1 hour, aging for 12 hours, and using ethanol to repeatedly centrifuge and wash to prepare manganese molybdate nanorods with a diameter of 300-500 nm and a length of about 10 microns, which are set aside;

[0037] 2) The manganese molybdate nanorod obtained in step 1) is used as the backbone material, and the manganese molybdate nanorod of 0.2 mmol is added to 40 ml of deionized water, stirred at room temperature with a magnetic stirrer for 10 minutes, and then placed in an ultrasonic cleaner Sonicate a...

Embodiment 2

[0042] A method for preparing manganese molybdate / cobalt molybdate graded heterostructure nanowires, comprising the steps of:

[0043] 1) Prepare 0.5mol / L NaMoO 4 Aqueous solution and 0.5mol / L MnCl 2 Aqueous solution, NaMoO as prepared 4 Aqueous solution: MnCl 2 Aqueous solution: CTAB: n-butanol: isooctane = 1.39ml: 1.39ml: 1.56g: 1.6ml: 9ml, add to the reactor, use the microemulsion method, stir for 2 hours with a magnetic stirrer, and age After 12 hours, use ethanol to repeatedly centrifuge and wash to prepare manganese molybdate nanorods with a diameter of 300-500 nm and a length of about 10 microns, and set aside;

[0044] 2) The manganese molybdate nanorod obtained in step 1) is used as the backbone material, and the manganese molybdate nanorod of 0.2 mmol is added to 40 ml of deionized water, stirred at room temperature with a magnetic stirrer for 15 minutes, and then placed in an ultrasonic cleaner Sonicate at a frequency of 40Hz for 0.2 hours to obtain a nearly col...

Embodiment 3

[0049] A method for preparing manganese molybdate / cobalt molybdate graded heterostructure nanowires, comprising the steps of:

[0050] 1) Prepare 0.5mol / L NaMoO 4 Aqueous solution and 0.5mol / L MnCl 2 Aqueous solution, NaMoO as prepared 4 Aqueous solution: MnCl 2 Aqueous solution: CTAB: n-butanol: isooctane = 1.39ml: 1.39ml: 1.56g: 1.6ml: 9ml, add to the reactor, use the microemulsion method, stir for 1 hour with a magnetic stirrer, and age After 12 hours, use ethanol to repeatedly centrifuge and wash to prepare manganese molybdate nanorods with a diameter of 300-500 nm and a length of about 10 microns, and set aside;

[0051] 2) The manganese molybdate nanorod obtained in step 1) is used as the backbone material, and the manganese molybdate nanorod of 0.2 mmol is added to 40 ml of deionized water, stirred at room temperature with a magnetic stirrer for 10 minutes, and then placed in an ultrasonic cleaner Ultrasonic treatment at a frequency of 50 Hz for 0.2 hours to obtain ...

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Abstract

The invention discloses a method for preparing manganese molybdate / cobalt molybdate hierarchical heterostructure nanowires. The method comprises the following steps of: preparing a NaMoO4 aqueous solution and a MnCl2aqueous solution; proportioning in a certain ratio of the NaMoO4aqueous solution to the MnCl2 aqueous solution to CTAB (Cetyltrimethyl Ammonium Bromide) to n-butyl alcohol to isooctane and preparing manganese molybdate nanorods by using a microemulsion method; adding the manganese molybdate nanorods into distilled water, stirring and ultrasonically cleaning to obtain transparent liquid; and adding the liquid into a flask, placing the flask in an oil bath of between 60 and 80 DEG C, condensing and refluxing, adding a CoCl2 solution and a Na2MoO4 solution with different concentrations in turn every certain time, stirring to react so as to obtain a product, separating and drying the product to obtain the manganese molybdate / cobalt molybdate hierarchical heterostructure nanowires, wherein the lengths of the nanowires reach 10 microns and the diameters of the nanowires are between 500 and 1,000nm; the manganese molybdate nanorods in the hierarchical heterostructure nanowires are used as a main material and the diameters of the manganese molybdate nanorods are between 300 and 500; and the cobalt molybdate is branch nanorods which orderly grow on the surfaces of the manganese molybdate nanorods and the diameters of the cobalt molybdate nanorods are between 30 and 50nm. The material has excellent electrochemical performance and can be used as an active material for electrodes of electrochemical super capacitors. The method has the advantages of low-cost raw materials, simple process and environmental friendliness.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials and electrochemical devices, and in particular relates to a preparation method of manganese molybdate / cobalt molybdate graded heterostructure nanowires, which can be used as electrode active materials for electrochemical supercapacitors. Background technique [0002] Electrochemical supercapacitor is a new type of energy storage device and device between batteries and conventional capacitors. It has larger specific capacitance than conventional capacitors, greater specific power and cycle life than batteries. Using supercapacitors and batteries to form a hybrid power system can well meet the needs of high power density output occasions such as starting and accelerating electric vehicles. It can be used in many fields, such as: hybrid electric vehicles, fuel cells, mobile phones, computers, etc. At present, most commercial supercapacitors are usually made of carbon materials with high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/32C30B29/62C30B7/14H01G9/042
CPCY02E60/13
Inventor 麦立强赵云龙韩春华杨帆
Owner 武汉经开科创运营有限公司
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