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Method for preparing carbon-coated nanometer molybdenum dioxide material

A technology of molybdenum dioxide and carbon coating, which is applied in the preparation/purification of carbon, vanadium oxide, nanotechnology, etc., can solve the problems of limited performance, unfavorable rapid carrier transport, etc., and achieve raw materials that are easily available, environmentally friendly, Simple operation effect

Active Publication Date: 2012-11-28
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the size of nanomolybdenum dioxide materials prepared by most methods is larger than 50nm, which is not conducive to the rapid transport of carriers in the material application process, thus limiting the improvement of its performance in electrochemical applications.
At the same time, the conductivity of the nano-molybdenum dioxide material itself needs to be improved in practical applications.

Method used

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  • Method for preparing carbon-coated nanometer molybdenum dioxide material
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  • Method for preparing carbon-coated nanometer molybdenum dioxide material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 1.0g fructose and 1.1g sodium molybdate (Na 2 MoO 4 ), forming a mixture (the number of moles of reducing sugar with Mo 6+ The molar ratio of molarity is 1:1, and the mass ratio of the sum of the mass of sugar and molybdenum precursor to the solvent is 1:19); the mixture is put into a reaction kettle, and crystallized at a heating temperature of 160°C; the crystallization After 4 hours of curing time, the reaction kettle was cooled to room temperature to obtain a crystallized product; the crystallized product was washed with water, and then centrifuged to obtain a carbon-coated nanomolybdenum dioxide material. Its XRD diffraction pattern is shown in figure 2 As shown in 1, the peak position and peak intensity of the diffraction peak are consistent with the JCPDS card (32-0671) of the XRD diffraction peak database, and it can be seen that the prepared MoO is a monoclinic structure 2 product.

Embodiment 2

[0022] Add 0.5g glucose and 0.4g molybdenum trioxide (MoO 3 2H 2 O), forming a mixture (the number of moles of reducing sugar and Mo 6+ The molar ratio of molarity is 1.25:1, and the mass ratio of the sum of the mass of sugar and molybdenum precursor to the solvent is 1:17.5); the mixture is put into a reaction kettle and crystallized at a heating temperature of 160°C; the crystallization After a heating time of 12 hours, the reaction kettle was cooled to room temperature to obtain a crystallized product; the crystallized product was washed with water, and then centrifuged to obtain a carbon-coated nano molybdenum dioxide material. Its XRD diffraction pattern is shown in figure 2 As shown in 3, the peak position and peak intensity of the diffraction peak are consistent with the JCPDS card (32-0671) of the XRD diffraction peak database, and it can be seen that the prepared MoO is a monoclinic structure 2 product; its TEM photo is shown in figure 1 As shown, it can be seen ...

Embodiment 3

[0024] Add 2.8g maltose and 1.2g ammonium molybdate ((NH 4 ) 6 Mo 7 o 24 4H 2 O), forming a mixture (the number of moles of reducing sugar and Mo 6+ The molar ratio of molarity is 1.20:1, the mass ratio of the sum of the mass of sugar and molybdenum precursor to the solvent is 1:12); put the mixture into the reaction kettle, and crystallize at a heating temperature of 160°C; crystallization After 22 hours of curing time, the reaction kettle was cooled to room temperature to obtain a crystallized product; the crystallized product was washed with water, and then centrifuged to obtain a carbon-coated nano molybdenum dioxide material. Its XRD diffraction pattern is shown in figure 2 As shown in 3, the peak position and peak intensity of the diffraction peak are consistent with the JCPDS card (32-0671) of the XRD diffraction peak database, and it can be seen that the prepared MoO is a monoclinic structure 2 product.

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Abstract

The invention relates to a method for preparing a carbon-coated nanometer molybdenum dioxide material. The method comprises the steps of: adding reducing sugar and a molybdenum precursor in a solvent to form a mixture, wherein the proportion of the reducing sugar to the molybdenum precursor is 1:1-10: 1 according to the ratio of the mole number of the reducing sugar to the mole number of M06+, and the mass ratio of the sum of the mass of the sugar and the molybdenum to the solvent is 1:2-1:50; filling the mixture into a reaction kettle and crystallizing at a heating temperature of 100 DEG C to 250 DEG C; after crystallizing for 2 h to 48 h, cooling the reaction kettle to a room temperature so as to obtain a crystallized product; cleaning the crystallized product by using water or dimethyl formamide; and then centrifugally separating to obtain the carbon-coated nanometer molybdenum dioxide material. The reducing sugar which is green, environment-friendly and easy to obtain not only serves as a mild reductant of the molybdenum precursor, but also serves as a precursor of carbon, so that a small-size carbon-coated nanometer molybdenum dioxide material with adjustable size can be obtained by one step by utilizing a water heating or solvent heating way.

Description

technical field [0001] The invention belongs to the field of synthesis of inorganic nanometer materials. More specifically, it relates to the size-controlled synthesis of a hydrothermal or solvothermal carbon-coated nanomolybdenum dioxide material. Background technique [0002] Molybdenum dioxide material has the characteristics of low metal resistance, high chemical stability and environmental friendliness. It has important applications in many research fields, including sensors, electrochromic devices, lithium-ion batteries, supercapacitors, and solar cells, so it has attracted more and more attention from researchers. Nano-molybdenum dioxide materials are more conducive to the conduction of electrons and the transport of ions, so they have potential application value in the field of electrochemistry, including as negative electrode materials for lithium-ion batteries (such as literature 1: J.H.Ku, Y. S.Jung, K.T.Lee ,C.H.Kim and S.M.Oh,Journal of the Electrochemical Soc...

Claims

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Application Information

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IPC IPC(8): C01G31/02C01B31/02B82Y30/00B82Y40/00H01B1/04H01B1/08H01B13/00C01B32/05
Inventor 孙晓红季惠明李晓雷
Owner TIANJIN UNIV
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