Hierarchically layered monometal hydroxide as well as synthesis method and application thereof

A hierarchical structure, hydroxide technology, applied in nickel oxide/nickel hydroxide, cobalt oxide/cobalt hydroxide and other directions, can solve the problems of cost, reduce product quality, uneconomical energy, and reduce energy consumption. , The effect of less capital investment and wide application significance

Active Publication Date: 2015-06-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Under such conditions, long-term heating is required to provide energy to decompose these precipitants, which is uneconomical from an energy point of view.
Second, the synthesis of materials with ordered nanostructures often requires the use of structure-directing agents such as surfactants or templates, which will bring additional costs
Third, when scaling up the synthesis, the mere use of large vessels will introduce nonlinear changes in experimental conditions, including reagent addition patterns, heating conditions, and distribution of chemical environments and temperatures, which will reduce product quality

Method used

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  • Hierarchically layered monometal hydroxide as well as synthesis method and application thereof
  • Hierarchically layered monometal hydroxide as well as synthesis method and application thereof
  • Hierarchically layered monometal hydroxide as well as synthesis method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Put NaNCO directly into water, stir and dissolve evenly, and obtain solution A with a molar concentration of 0.05mol / L; 2 ·6H 2 O is directly put into water, stirred evenly and dissolved to obtain a solution B with a molar concentration of 0.015mol / L; mix 1L of solution A and 1L of solution B, stir solution A at a speed of 500rpm, and use a peristaltic pump at 4mL / min During the stirring process, gradually add solution B to solution A and mix. After B is completely added, continue to stir for 3 hours. After the precipitate obtained is washed and dried, the described supercapacitor α-Ni(OH) can be obtained 2 .

[0040] figure 1 For the XRD pattern of the obtained sample, with α-Ni(OH) 2 The standard spectrum is completely consistent, indicating that the product is α-Ni(OH) 2 . figure 2 It is the SEM picture of the product, it can be seen that the product has a flower-like aggregate structure with a size of 100-200nm. Depend on Figure 1~2 It can be seen that the...

Embodiment 2

[0045] Put NaNCO directly into water, stir and dissolve evenly, and obtain solution A with a molar concentration of 0.1mol / L; add CoCl 2 ·6H 2 O is directly put into water, stirred and dissolved evenly, to obtain a solution B with a molar concentration of 0.05mol / L; mix 1L of solution A and 1L of solution B, stir solution A at a speed of 500rpm, and use a peristaltic pump at a rate of 10mL / min During the stirring process, gradually add solution B to solution A and mix. After B is completely added, continue to stir for 3 hours. After the precipitate obtained is washed and dried, the described supercapacitor α-Co(OH) can be obtained 2 .

[0046] The α-Co(OH) prepared in this embodiment 2 It still has a three-dimensional overlapping structure, but its specific surface area is slightly lower at 280.2m 2 g -1 .

Embodiment 3

[0048] Put NaNCO directly into water, stir and dissolve evenly to obtain a solution A with a molar concentration of 0.5mol / L; 2 ·6H 2 O is directly put into water, stirred and dissolved evenly to obtain a solution B with a molar concentration of 0.15mol / L; mix 1L of solution A and 1L of solution B, stir solution A at a speed of 500rpm, and use a peristaltic pump at 4mL / min During the stirring process, gradually add solution B to solution A and mix. After B is completely added, continue to stir for 3 hours. After the precipitate obtained is washed and dried, the described supercapacitor α-Ni(OH) can be obtained 2 .

[0049] The α-Ni(OH) prepared by this implementation 2 With a loose stacking structure, its specific surface area is 72.0m 2 g -1 .

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Abstract

The invention discloses a synthesis method of a hierarchically layered monometal hydroxide. The synthesis method comprises the following steps: firstly, mixing sodium cyanate with water to obtain a solution A, and mixing a soluble salt of a metal M with water to obtain a solution B, wherein the mass concentration of the solution A is 0.03-0.5mol/L, the mass concentration of the solution B is 0.01-1mol/L, and the metal M is Ni or Co; then adding the solution B into the solution A which has the same volume as the solution B, stirring, and carrying out reaction to obtain a precipitate; and finally posttreating the precipitate to obtain the hierarchically layered monometal hydroxide. The hierarchically layered monometal hydroxide is prepared on a large scale in a suitable alkaline condition which is created by hydrolyzing nontoxic low-cost sodium cyanate at room temperature. The synthesis method disclosed by the invention is universal, simple and controllable, omits the procedure of heating, adopts no additional structure-directing agents, is high in cost-performance ratio and can be applied widely, and the hierarchically layered monometal hydroxide synthesized by adopting the synthesis method has excellent electrochemical properties.

Description

technical field [0001] The invention relates to the field of preparation of nanometer materials, in particular to a layered single metal hydroxide with a hierarchical structure and its synthesis method and application. Background technique [0002] Supercapacitor is an environmentally friendly, irreplaceable new energy storage and energy saving device between traditional capacitors and rechargeable batteries. It not only has the characteristics of fast charging and discharging of capacitors, but also has the energy storage mechanism of electrochemical batteries. Compared with traditional capacitors, supercapacitors have the characteristics of high power density, long cycle life, no pollution, and wide operating temperature range, so their applications in electric vehicles, communications, electronic signal monitoring and other fields have attracted more and more attention. [0003] Two-dimensional layered double hydroxides (LDHs) are a class of ionic layered compounds, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/04C01G51/04
Inventor 谷长栋葛翔王秀丽涂江平
Owner ZHEJIANG UNIV
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