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MoO2/Co(OH)2 grading composite nano-material, and preparation method and application thereof

A composite nanomaterial and nanosheet technology, which is applied in the field of MoO2/Co2 graded composite nanomaterials and their preparation, can solve the problems of poor cycle stability, low energy density, low electronic conductivity, etc., achieves low equipment requirements, and improves specific surface area. , the effect of simple process

Active Publication Date: 2014-01-08
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] MoO 2 Low toxicity, abundant natural reserves, good electronic conductivity, but relatively low energy density
Co(OH) 2 It has a stable layered structure and large interlayer spacing, high energy density, and large rate performance, but its electronic conductivity is very low, and its cycle stability is relatively poor when it is used as an electrode material alone.
MoO 2 and Co(OH) 2 As ideal electrode materials for supercapacitors, each has its own advantages, but nanomaterials that are composites of the two and have both hierarchical structures and synergistic effects have rarely been reported.

Method used

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  • MoO2/Co(OH)2 grading composite nano-material, and preparation method and application thereof
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  • MoO2/Co(OH)2 grading composite nano-material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] MoO 2 / Co(OH) 2 A method for preparing a hierarchical composite nanomaterial, comprising the steps of:

[0038] 1) Wash the nickel foam with 1mol / L nitric acid solution, and then wash it repeatedly with deionized water for use;

[0039] 2) Prepare 0.1mol / L (NH4 ) 6 Mo 7 o 24 4H 2 O and 1mol / L NH 4 Cl mixed solution;

[0040] 3) Add ammonia water dropwise to the mixed solution obtained in step 2), adjust the pH value to 8, and use the obtained solution as the precursor solution for the first electrochemical deposition;

[0041] 4) Use the nickel foam obtained in step 1) as the working electrode, the platinum electrode as the counter electrode, and the saturated calomel electrode as the reference electrode, at 10mA / cm 2 Under the current density and the voltage range of -0.4 ~ -0.8V, electrodeposited for 6 minutes, the MoO 2 Nano film nickel foam;

[0042] 5) Attach MoO to the obtained step 4) 2 The nickel foam of the nano-film is washed repeatedly with deioniz...

Embodiment 2

[0051] MoO 2 / Co(OH) 2 A method for preparing a hierarchical composite nanomaterial, comprising the steps of:

[0052] 1) Wash the nickel foam with 1mol / L nitric acid solution, and then wash it repeatedly with deionized water for use;

[0053] 2) Prepare 0.05mol / L (NH 4 ) 6 Mo 7 o 24 4H 2 O and 0.5mol / L NH 4 Cl mixed solution;

[0054] 3) Add ammonia water dropwise to the mixed solution obtained in step 2), adjust the pH value to 10, and use the obtained solution as the precursor solution for the first electrochemical deposition;

[0055] 4) Using the nickel foam obtained in step 1) as the working electrode, the platinum electrode as the counter electrode, and the saturated calomel electrode as the reference electrode, conduct electrodeposition for 8 minutes to obtain MoO 2 Nano film nickel foam;

[0056] 5) Attach MoO to the obtained step 4) 2 The nickel foam of the nano-film is washed repeatedly with deionized water, and dried for later use;

[0057] 6) Prepare 0...

Embodiment 3

[0062] MoO 2 / Co(OH) 2 A method for preparing a hierarchical composite nanomaterial, comprising the steps of:

[0063] 1) Wash the nickel foam with 1mol / L nitric acid solution, and then wash it repeatedly with deionized water for use;

[0064] 2) Prepare 0.15mol / L (NH 4 ) 6 Mo 7 o 24 4H 2 O and 1.5mol / L NH 4 Cl mixed solution;

[0065] 3) Add ammonia water dropwise to the mixed solution obtained in step 2), adjust the pH value to 9, and use the obtained solution as the precursor solution for the first electrochemical deposition;

[0066] 4) Using the nickel foam obtained in step 1) as the working electrode, the platinum electrode as the counter electrode, and the saturated calomel electrode as the reference electrode, conduct electrodeposition for 3 minutes to obtain MoO 2 Nano film nickel foam;

[0067] 5) Attach MoO to the obtained step 4) 2 The nickel foam of the nano-film is washed repeatedly with deionized water, and dried for later use;

[0068] 6) Prepare 1....

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Abstract

The invention relates to an MoO2 / Co(OH)2 grading composite nano-material, and a preparation method thereof. The material is taken as a high-performance super capacitor electrode material, and the composite nano-material is formed by growing a Co(OH)2 nano-sheet on an MoO2 nano-film, wherein the Co(OH)2 nano-sheet is 4-10 nm thick, and the MoO2 / Co(OH)2 grading composite nano-material is obtained by twice simple electro-deposition. The MoO2 / Co(OH)2 grading composite nano-material has a simple process, the adopted electro-deposition method has low requirements on equipment, morphology and size dimension of the material can be controlled through changing current density and deposition time, expanded production is realized, and the adopted design method can be applied to research and development of other similar materials.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and electrochemistry, and specifically relates to a MoO 2 / Co(OH) 2 A hierarchical composite nanomaterial and a preparation method thereof, the material can be used as a high-performance supercapacitor electrode material. Background technique [0002] As a green chemical storage device, supercapacitors are widely used in mobile devices, electronic devices, and hybrid vehicles. Although they have the characteristics of high power density and fast charge and discharge rates, their low energy density limits their use. Further development. Transition metal oxides and hydroxides are considered to be good pseudocapacitive materials. During the charging and discharging process, rapid redox reactions occur on the surface of electrode materials, and there is also a certain degree of ion intercalation and deintercalation near the surface, which effectively improves the The energy density of the ele...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/30B82Y40/00
CPCY02E60/13
Inventor 麦立强赫库尔·穆隆达·卡乐乐杜春晖魏湫龙
Owner WUHAN UNIV OF TECH
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