CN103887081A - Nanocomposite material of nitrogen doped with graphene/zinc ferrite and preparation method thereof - Google Patents
Nanocomposite material of nitrogen doped with graphene/zinc ferrite and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a nanocomposite material of nitrogen doped with graphene/zinc ferrite and a preparation method thereof. The method comprises the steps that graphite oxides are put in ethylene glycol for conducting ultrasonic dispersion; zinc nitrate and ferric nitrate are dissolved in water, then added in the graphite oxide solution and evenly dispersed; at last, urea is added in the evenly-dispersed mixed solution, after the urea is dissolved, the mixed solution is moved into a hydrothermal kettle for conducting a solvothermal synthesis reaction, and after products are centrifugally washed and dried, the nanocomposite material of the nitrogen doped with the graphene/zinc ferrite is obtained. According to the nanocomposite material of the nitrogen doped with the graphene/zinc ferrite and the preparation method thereof, the urea is used for reduction of graphene oxides, in the reduction process, the nitrogen atoms are doped on the surface of the graphene, doping of the nitrogen atoms changes the surface chemical property of the graphene, and the alkalinity of the urea enables the zinc ferrite to be formed on the surface of the nitrogen doped with the graphene while the surface defect of graphene prepared through a chemical method is overcome. Meanwhile, zinc ferrite nano particles can further prevent the graphene from being piled up together between layers, and the electrochemical property of the nanocomposite material is improved.
Description
Technical field
The invention belongs to Nano-composite materials field, specifically relate to a kind of nitrogen-doped graphene/zinc ferrite nano composite material and preparation thereof.
Background technology
Graphene is the one of material with carbon element, since within 2004, coming out, because its unique photoelectric property and structural behaviour have caused that people pay attention to widely.Graphene is widely used in energy storage device (ultracapacitor, lithium ion battery, fuel cell etc.) because of its excellent electric conductivity.
Graphene prepared by chemical method is more easily piled up, and the difference of the degree of reduction also can affect the performance of Graphene itself, in order to improve its performance, so, the preparation method of Graphene and modification become the focus of research, can supply a gap to a great extent and introduce heteroatom in prepared by Graphene, improve performance.For example, the people such as Klaus M ü llen adulterated on the surface of Graphene by hydro thermal method nitrogen, boron (Three-Dimensional Nitrogen and Boron Co-doped Graphene for High-Performance All-Solid-State Supercapacitors.Advanced Materials2012,24 (37): 5130-5135.) simultaneously; Chinese patent (CN103274393A, CN102760866A, CN103359708A, CN103359711A and CN102167310A etc.) has been introduced nitrogenous source by different chemical methodes, prepared nitrogen-doped graphene, wherein a lot of preparation methods are faced with that production cost is high, reaction equipment needed thereby complexity, severe reaction conditions, the problem such as yield poorly; Although the nitrogen-doped graphene obtaining, compared with Graphene, has improved its electric conductivity, as set it as the electrode material of ultracapacitor, its chemical property (as than electric capacity) cannot meet the requirement of practical application far away.
Zinc ferrite in metal oxide becomes the focus of research recently, its theory than electric capacity up to 1000mAh/g, but its decay is fast, poor stability, so by itself and compound focus (the Graphene anchoredwith ZnFe2O4nanoparticles as a high-capacity anode material for lithium-ion batteries.Solid State Sciences2013 that becomes research of material with carbon element, 17,67-71.), but its performance still awaits improving.Nitrogen-doped graphene/zinc ferrite nano composite material can make up defect separately, improves the overall performance of material, at present, nitrogen doped graphite/zinc ferrite bielement nano composite material be have not been reported.
Summary of the invention
For the problem of existing technology of preparing, the object of this invention is to provide a kind of with low cost, simple to operate nitrogen-doped graphene/zinc ferrite nano composite material and the method thereof prepared, this preparation method's synthesis technique is simple, is suitable for large-scale industrial production.
The technical solution that realizes the object of the invention is: a kind of nitrogen-doped graphene/zinc ferrite nano composite material, described composite material is made up of basis material nitrogen-doped graphene and zinc ferrite, wherein, the mass ratio of basis material nitrogen-doped graphene and zinc ferrite is 1:3～1:10; In described basis material nitrogen-doped graphene, the doping of nitrogen is 1～2%.
A preparation method for nitrogen-doped graphene/zinc ferrite nano composite material, comprises the steps:
The first step: by a certain amount of graphite oxide ultrasonic a period of time in ethylene glycol, obtain finely dispersed graphene oxide solution;
Second step: the zinc nitrate taking and ferric nitrate are dissolved in deionized water, and stir and cause it and dissolve completely;
The 3rd step: the mixed salt solution of dissolving is poured in the graphene oxide solution that the first step obtains, and stirred it is mixed;
The 4th step: urea is joined to the 3rd step and obtain in mixed system, again stir, it is uniformly dispersed, wherein the mass ratio of urea and graphite oxide is 100:1～200:1;
The 5th step: the above-mentioned mixed solution mixing is transferred in water heating kettle, carries out hydro-thermal reaction at 120～200 DEG C;
The 6th step: the 5th step product is carried out to centrifugation, and repeatedly by deionized water washing, dry rear nitrogen-doped graphene/zinc ferrite nano composite material that obtains.
Ultrasonic jitter time described in step 1 is 2～5h.
The mol ratio of the ferric nitrate described in step 2 and zinc nitrate is 2:1, and the dispersed with stirring time is 5～30min.
The dispersed with stirring time described in step 3 is 30～90min.
Mixing time described in step 4 is 60～90min.
Reaction time described in step 5 is 10～24h.
Compared with prior art, tool of the present invention has the following advantages in the present invention: (1) the present invention is by the method preparation of solvent heat, low for equipment requirements, do not need very high temperature, synthesis technique is simple, is beneficial to large-scale production cheaply, and reaction reagent is nontoxic, environmental pollution is little; (2) adopt urea to reduce to graphene oxide, in reduction, at the surface doping of Graphene nitrogen-atoms, the doping of nitrogen-atoms has changed Graphene surface chemical property, made up chemical method and prepared the blemish while that Graphene exists, the alkalescence that urea provides, makes zinc ferrite form on the surface of nitrogen-doped graphene, zinc ferrite nano particle can further stop Graphene accumulation between layers to be reunited simultaneously, improves the chemical property of composite material.So nitrogen-doped graphene and zinc ferrite are combined with each other, give full play to both advantages, improve defect separately, thereby obtain the electrode material of chemical property excellence.
Brief description of the drawings
Accompanying drawing 1 is the schematic flow sheet of nitrogen-doped graphene/zinc ferrite Nano-composite materials of the present invention.
Accompanying drawing 2 is XPS spectrum figure (a) and structural characterization figure XRD spectra (b) of the embodiment of the present invention 1 gained nitrogen-doped graphene/zinc ferrite nano composite material.
Accompanying drawing 3 is morphology characterization figure TEM photos of the embodiment of the present invention 1 gained nitrogen-doped graphene/zinc ferrite nano composite material.
Accompanying drawing 4 is structural characterization figure XRD spectra (a) and cyclic voltammetric performance test figure (b) of the embodiment of the present invention 3 gained nitrogen-doped graphene/zinc ferrite nano composite materials.
Embodiment
Below main by reference to the accompanying drawings 1 and and the preparation method of the specific embodiment mass ratio that is 1～2% to nitrogen doping nitrogen-doped graphene/zinc ferrite nano composite material that is 1:3～1:10 be described in further detail.
Embodiment 1: the preparation method of nitrogen-doped graphene/zinc ferrite nano composite material (graphite oxide and zinc ferrite mass ratio are 1:3) that nitrogen content is 1%, comprises the following steps:
The first step, the graphite oxide that is 100mg by content is ultrasonic in the ethylene glycol of 50mL, obtains uniform graphene oxide solution after ultrasonic 3h;
Second step, is dissolved in 10mL deionized water for stirring 5min by 1.0059g ferric nitrate and 0.3703g zinc nitrate, causes it and dissolves completely;
The 3rd step, pours above-mentioned gained mixed solution in the graphene oxide solution that the first step obtains into, and stirs 30min, and it is mixed;
The 4th step, joins the 3rd step by the urea of 10g and obtains in mixed system, again stirs 60min, and it is uniformly dispersed;
The 5th step: the above-mentioned mixed solution mixing is transferred in water heating kettle and carries out solvent thermal reaction, and reaction temperature is 100 DEG C, and the reaction time is 24h;
The 6th step: the 5th step product is carried out to centrifugation, and repeatedly by deionized water washing, dry rear nitrogen-doped graphene/zinc ferrite nano composite material that obtains.
As shown in Fig. 2 (a) XPS, in figure, contain and have carbon, oxygen, five kinds of elements of nitrogen and iron and zinc, have illustrated the successful doping of nitrogen element, and the existence of zinc ferrite, and wherein the content of nitrogen element is 1%, structural characterization figure X-ray powder diffraction (XRD) as shown in Fig. 2 (b), visible significantly characteristic diffraction peak in figure, its characteristic diffraction peak can belong to zinc ferrite nano particle, therefore prepared product is nitrogen-doped graphene/zinc ferrite nano composite material.
As shown in Figure 3, zinc ferrite nano particle is evenly distributed on the surface of nitrogen-doped graphene to its TEM photo as we can see from the figure, shows the successful preparation of binary nitrogen-doped graphene/zinc ferrite nano composite material.
Embodiment 2: the preparation method of nitrogen-doped graphene/zinc ferrite nano composite material (graphite oxide and zinc ferrite mass ratio are 1:5) that nitrogen content is 1.5%, comprises the following steps:
The first step, the graphite oxide that is 80mg by content is ultrasonic 2h in 40mL ethylene glycol, obtains finely dispersed graphene oxide solution;
Second step, is dissolved in 20mL deionized water for stirring 20min by 1.3411g ferric nitrate and 0.4938g zinc nitrate;
The 3rd step, pours above-mentioned obtained mixed solution in the graphene oxide solution that the first step obtains into, and stirs 60min, and it is mixed;
The 4th step, joins the 3rd step by the urea of 15g and obtains in mixed system, again stirs 75min, and it is uniformly dispersed;
The 5th step: the above-mentioned mixed solution mixing is transferred in water heating kettle and carries out solvent thermal reaction, and reaction temperature is 180 DEG C, and the reaction time is 18h;
The 6th step: the 5th step product is carried out to centrifugation, and repeatedly by deionized water washing, dry rear nitrogen-doped graphene/zinc ferrite nano composite material that obtains.
Embodiment 3: the preparation method of nitrogen-doped graphene/zinc ferrite nano composite material (graphite oxide and zinc ferrite mass ratio are 1:10) that nitrogen content is 2%, comprises the following steps:
The first step, the graphite oxide that is 100mg by content is ultrasonic 5h in 40mL ethylene glycol, obtains finely dispersed graphene oxide solution;
Second step, is dissolved in 20mL deionized water for stirring 30min by 3.3529g ferric nitrate and 1.2344g zinc nitrate;
The 3rd step, pours above-mentioned mixed solution in the graphene oxide solution that the first step obtains into, and stirs 90min, and it is mixed;
The 4th step, joins the 3rd step by the urea of 20g and obtains in mixed system, again stirs 90min, and it is uniformly dispersed;
The 5th step: the above-mentioned mixed solution mixing is transferred in water heating kettle and carries out hydro-thermal reaction, and reaction temperature is 200 DEG C, and the reaction time is 10h;
The 6th step: the 5th step product is carried out to centrifugation, and repeatedly by deionized water washing, dry rear nitrogen-doped graphene/zinc ferrite nano composite material that obtains.
Structural characterization figure X-ray powder diffraction (XRD) as shown in Figure 4 (a), visible significantly characteristic diffraction peak in figure, its characteristic diffraction peak can belong to zinc ferrite nano particle, in the time that hydrothermal temperature changes, the characteristic peak that can see zinc ferrite has small variation, and provable prepared product is nitrogen-doped graphene/zinc ferrite nano composite material.(b) be its electrochemical property test figure, in the time sweeping speed for 1mV/s, its than electric capacity up to 659F/g, electrode material compared with one-component is greatly increased, and it is in the time that current density is 100mA/g, and circulation 5000 is enclosed, and coulomb efficiency maintains 100% left and right always, remain on 85% left and right than electric capacity sustainment rate, be greatly improved than the binary composition of the nitrogen that do not adulterate.
Claims (8)
1. nitrogen-doped graphene/zinc ferrite nano composite material, is characterized in that described composite material is made up of basis material nitrogen-doped graphene and zinc ferrite, and wherein, the mass ratio of basis material nitrogen-doped graphene and zinc ferrite is 1:3～1:10; In described basis material nitrogen-doped graphene, the doping of nitrogen is 1～2%.
2. nitrogen-doped graphene/zinc ferrite nano composite material according to claim 1, is characterized in that described composite material prepared by following steps:
The first step: by graphite oxide ultrasonic dispersion in ethylene glycol, obtain finely dispersed graphene oxide solution;
Second step: zinc nitrate and ferric nitrate are dissolved in deionized water, and stir and cause it and dissolve completely;
The 3rd step: the mixed salt solution of dissolving is poured in the graphene oxide solution that the first step obtains, and stirred it is mixed;
The 4th step: urea is joined to the 3rd step and obtain in mixed system, again stir, it is uniformly dispersed, wherein the mass ratio of urea and graphite oxide is 100:1～200:1;
The 5th step: the above-mentioned mixed solution mixing is transferred in water heating kettle, carries out hydro-thermal reaction at 120～200 DEG C;
The 6th step: the 5th step product is carried out to centrifugation, and repeatedly by deionized water washing, dry rear nitrogen-doped graphene/zinc ferrite nano composite material that obtains.
3. a preparation for nitrogen-doped graphene/zinc ferrite nano composite material, is characterized in that comprising the steps:
The first step: by graphite oxide ultrasonic dispersion in ethylene glycol, obtain finely dispersed graphene oxide solution;
Second step: zinc nitrate and ferric nitrate are dissolved in deionized water, and stir and cause it and dissolve completely;
The 3rd step: the mixed salt solution of dissolving is poured in the graphene oxide solution that the first step obtains, and stirred it is mixed;
The 4th step: urea is joined to the 3rd step and obtain in mixed system, again stir, it is uniformly dispersed, wherein the mass ratio of urea and graphite oxide is 100:1～200:1;
The 5th step: the above-mentioned mixed solution mixing is transferred in water heating kettle, carries out hydro-thermal reaction at 120～200 DEG C;
The 6th step: the 5th step product is carried out to centrifugation, and repeatedly by deionized water washing, dry rear nitrogen-doped graphene/zinc ferrite nano composite material that obtains.
4. the preparation of nitrogen-doped graphene/zinc ferrite nano composite material according to claim 3, is characterized in that the ultrasonic jitter time described in the first step is 2～5h.
5. the preparation of nitrogen-doped graphene/zinc ferrite nano composite material according to claim 3, the mol ratio that it is characterized in that the ferric nitrate described in second step and zinc nitrate is 2:1, the dispersed with stirring time is 5～30min.
6. the preparation of nitrogen-doped graphene/zinc ferrite nano composite material according to claim 3, is characterized in that the dispersed with stirring time described in the 3rd step is 30～90min.
7. the preparation of nitrogen-doped graphene/zinc ferrite nano composite material according to claim 3, is characterized in that the mixing time described in the 4th step is 60～90min.
8. the preparation of nitrogen-doped graphene/zinc ferrite nano composite material according to claim 3, is characterized in that the reaction time described in the 5th step is 10～24h.
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| CN104787740A (en) * | 2015-04-30 | 2015-07-22 | 青岛大学 | Preparation method of three-dimensional nitrogen-doped graphene |
| CN104893248A (en) * | 2015-05-27 | 2015-09-09 | 河北大学 | Preparation method and application of inorganic hybrid smoke-suppression flame retardant |
| CN105606676A (en) * | 2016-03-24 | 2016-05-25 | 安徽理工大学 | Preparation method of nitrogen-doped reduced graphene-AuAg double-metal nano compound and application of nitrogen-doped reduced graphene-AuAg double-metal nano compound to electrochemical detection of daunorubicin hydrochloride |
| CN107731544A (en) * | 2017-09-06 | 2018-02-23 | 济南大学 | A kind of graphene zinc ferrite combination electrode material and preparation method thereof |
| CN110564183A (en) * | 2019-08-22 | 2019-12-13 | 魏军刚 | graphene-coated mica material and preparation method and application thereof |
| CN111725510A (en) * | 2020-06-28 | 2020-09-29 | 金汤杰 | Lithium battery negative electrode material and preparation process thereof |
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Cited By (10)
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| CN104787740A (en) * | 2015-04-30 | 2015-07-22 | 青岛大学 | Preparation method of three-dimensional nitrogen-doped graphene |
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| CN105606676A (en) * | 2016-03-24 | 2016-05-25 | 安徽理工大学 | Preparation method of nitrogen-doped reduced graphene-AuAg double-metal nano compound and application of nitrogen-doped reduced graphene-AuAg double-metal nano compound to electrochemical detection of daunorubicin hydrochloride |
| CN105606676B (en) * | 2016-03-24 | 2018-09-28 | 安徽理工大学 | The preparation of nitrating reduced graphene-AuAg bimetal nano compounds and its application in Electrochemical Detection daunorubicin hydrochloride |
| CN107731544A (en) * | 2017-09-06 | 2018-02-23 | 济南大学 | A kind of graphene zinc ferrite combination electrode material and preparation method thereof |
| CN107731544B (en) * | 2017-09-06 | 2019-06-25 | 济南大学 | A kind of graphene zinc ferrite combination electrode material and preparation method thereof |
| CN110564183A (en) * | 2019-08-22 | 2019-12-13 | 魏军刚 | graphene-coated mica material and preparation method and application thereof |
| CN111725510A (en) * | 2020-06-28 | 2020-09-29 | 金汤杰 | Lithium battery negative electrode material and preparation process thereof |
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