CN106582762B - A kind of nitrogen-doped graphene/MnO2Composite material and preparation method - Google Patents

A kind of nitrogen-doped graphene/MnO2Composite material and preparation method Download PDF

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CN106582762B
CN106582762B CN201611151488.3A CN201611151488A CN106582762B CN 106582762 B CN106582762 B CN 106582762B CN 201611151488 A CN201611151488 A CN 201611151488A CN 106582762 B CN106582762 B CN 106582762B
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mno
composite material
nitrogen
preparation
solution
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CN106582762A (en
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李世华
苗鹤
刘兆平
薛业建
孙珊珊
王勤
董正豪
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Ningbo Graphene Innovation Center Co Ltd
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Ningbo Institute of Material Technology and Engineering of CAS
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J27/00Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
    • B01J27/24Nitrogen compounds
    • B01J35/615

Abstract

The present invention provides a kind of nitrogen-doped graphene/MnO2Composite material and preparation method, method provided by the invention are added ammonium persulfate heating reaction, obtain nitrogen-doped graphene/MnO after mixing manganese source compound solution and graphene oxide solution2Composite material;This method can not only a step realize the reduction of graphene oxide, nitrogen atom doping and MnO2Load, and the MnO in obtained composite material2For threadiness, and then its specific surface area in the composite is increased, so that the catalytic activity of obtained composite material greatly enhances.

Description

A kind of nitrogen-doped graphene/MnO2Composite material and preparation method
Technical field
Technical field of nano material of the present invention more particularly to a kind of nitrogen-doped graphene/MnO2Composite material and its preparation Method.
Background technique
The basic structural unit of graphene is the hexatomic ring of most rock-steady structure, and itself and fullerene and carbon nanotube phase Than not only cheap, raw material is easy to get, and light weight, and ideal large specific surface area, thermal conductivity is good, is current ideal two wiener Rice material, wide application prospect is shown in research fields such as microelectronics, functional material and chemical sensitisations.
It is one of numerous research fields of graphene that nitrogen-doped graphene, which loads compound, receives great pass in recent years Note, and nitrogen-doped graphene is introduced into metal oxide, the catalytic performance of metal oxide can be improved, at present about metal Oxide introducing nitrogen-doped graphene report is also relatively more, such as Applied Surface Science, 366 (2016), 552- MnOx disclosed in 560 and nitrogen-doped graphene composite material, for another example ACS Appl.Mater.Interfaces 2016,8, 5251-5260 also discloses MnO2With nitrogen-doped graphene composite material;But presently disclosed nitrogen-doped graphene/MnO2It is multiple Manganese dioxide is particle or sheet in condensation material, and catalytic performance is poor, has seriously affected its application, and disclosed preparation The method and process of composite material is also comparatively laborious, it thus provides nitrogen-doped graphene/MnO that a kind of catalytic performance is good2It is compound Material tool has very important significance.
Summary of the invention
In view of this, technical problem to be solved by the present invention lies in provide a kind of nitrogen-doped graphene/MnO2Composite wood The composite material catalytic performance of material and preparation method thereof, the method preparation provided through the invention is good, and preparation method is simple.
The present invention also provides a kind of nitrogen-doped graphene/MnO2Composite material, it is described to be compounded in nitrogen-doped graphene piece MnO on layer2For linear MnO2, the threadiness MnO210~20nm of diameter.
The present invention also provides a kind of nitrogen-doped graphene/MnO2The preparation method of composite material, comprising:
1) manganese source compound solution and graphene oxide solution are mixed, obtain the first mixed liquor,
The manganese source compound is hydration manganese acetate;
2) ammonium persulfate is added into the first mixed solution, 1~36h of hydro-thermal reaction under the conditions of 80~200 DEG C obtains nitrogen Doped graphene/MnO2Composite material.
Preferably, the mass ratio of the graphene oxide and manganese source compound is 1: (5~30).
Preferably, the concentration of the graphene oxide solution is 2~3.5g/L.
Preferably, the concentration of the manganese source compound solution is 5~100g/L.
Preferably, the manganese acetate and the ammonium persulfate mass ratio 1: (2-10).
Preferably, the concentration of the ammonium persulfate solution is 10~100g/L.
Compared with prior art, the present invention provides a kind of nitrogen-doped graphene/MnO2Composite material and preparation method, Method provided by the invention is capable of the reduction of step realization graphene oxide, nitrogen atom doping and MnO2Load;In MnO2It generates Process, the oxygen-containing functional group on graphene oxide make MnO as nucleating point2It is nucleated and axially grows, and obtain compound MnO in material2For MnO2Nano wire, so increase its in the composite specific surface area (specific surface area 100~ 200m2/ g, graphene oxide is not used is less than 50m2/ g) so that the catalytic activity of obtained composite material greatly enhances.
Detailed description of the invention
Fig. 1 is nitrogen-doped graphene/MnO that the embodiment of the present invention 1 is prepared2Composite material amplifies 2K times of scanning Electron microscope;
Fig. 2 is nitrogen-doped graphene/MnO that the embodiment of the present invention 1 is prepared2Composite material amplifies 3K times of scanning Electron microscope;
Fig. 3 is nitrogen-doped graphene/MnO prepared by comparative example 12Composite material scanning electron microscope (SEM) photograph;
Fig. 4 is nitrogen-doped graphene/MnO prepared by the embodiment of the present invention 1~3 and comparative example 1,22The electricity of composite material Chemical data;
Fig. 5 is nitrogen-doped graphene/MnO prepared by this comparative example 22The scanning electron microscope (SEM) photograph of composite material.
Specific embodiment
The present invention provides a kind of nitrogen-doped graphene/MnO2Composite material, which is characterized in that described to be compounded in N doping MnO on graphene sheet layer2For linear MnO2, the threadiness MnO210~20nm of diameter;The threadiness MnO2Specific surface 100~200m of product2/g。
The present invention also provides a kind of nitrogen-doped graphene/MnO2The preparation method of composite material, comprising:
1) manganese source compound solution and graphene oxide solution are mixed, obtain the first mixed liquor,
The manganese source compound is hydration manganese acetate;
2) ammonium persulfate is added into the first mixed solution, 1~36h of hydro-thermal reaction under the conditions of 80~200 DEG C obtains nitrogen Doped graphene/MnO2Composite material.
According to the present invention, the present invention mixes manganese source compound solution and graphene oxide solution, obtains the first mixed liquor; Wherein, the manganese source compound is preferably four hydration manganese acetates;The manganese source compound solution is preferably the water of manganese source compound Solution;The concentration of the manganese source compound solution is preferably 5~100g/L, more preferably 10~40g/L;The graphene oxide Solution is preferably graphene oxide water solution;The concentration of the graphene oxide solution is preferably 2~3.5mg/mL, more preferably 2.5~3mg/mL;The mass ratio of the graphene oxide and manganese source compound is 1:(5~30).The present invention is to mixed mode There is no particular/special requirement, is uniformly mixed raw material.
According to the present invention, ammonium persulfate is added into the first mixed solution in the present invention, and hydro-thermal is anti-under the conditions of 80~200 DEG C 1~36h is answered, nitrogen-doped graphene/MnO is obtained2Composite material;;Wherein, the concentration of the ammonium persulfate solution be preferably 10~ 100g/L, more preferably 30~80g/L, most preferably 50~60g/L;The manganese acetate and the ammonium persulfate mass ratio are preferred It is 1: (2-10);The temperature of the heating reaction is preferably 80~200 DEG C, and more preferably 120~160 DEG C, the heating reaction Time be preferably 1~36h, more preferably 10~16 hours, more preferably 12~14 hours.
Nitrogen-doped graphene/MnO provided by the invention2The preparation method of composite material can not only step realization oxidation stone The reduction of black alkene, nitrogen atom doping and MnO2Load, and the MnO in obtained composite material2For threadiness, and then increase it The catalytic activity of specific surface area in the composite, the composite material made greatly enhances.
It is clearly and completely described below in conjunction with the technical solution of the embodiment of the present invention, it is clear that described implementation Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common Technical staff's every other embodiment obtained without making creative work belongs to the model that the present invention protects It encloses.
Embodiment 1
Selecting concentration for the graphene oxide water solution and concentration of 2.5g/L is 50g/L manganese acetate aqueous solution, according to oxidation Graphene is uniformly mixed with manganese acetate mass ratio 1: 15, and 100g/L over cure is added according to manganese acetate and ammonium persulfate mass ratio 1: 3 Acid ammonium solution, then being reacted 12 hours at a temperature of mixture under hydrothermal conditions 120 DEG C, the product deionized water that will be obtained Washing is for several times until the PH of clear liquid is neutral;Finally by the cold dry end product that obtains of the product washed to get to N doping graphite Alkene/MnO2Composite material.
The pattern of obtained composite material is detected, the result is shown in Figure 1~Fig. 2, wherein Fig. 1 is the embodiment of the present invention 1 Nitrogen-doped graphene/the MnO being prepared2Composite material amplifies 2K times of scanning electron microscope (SEM) photograph;Fig. 2 is the system of the embodiment of the present invention 1 Standby obtained nitrogen-doped graphene/MnO2Composite material amplifies 3k times of scanning electron microscope (SEM) photograph.It can be seen from the figure that of the invention MnO in the composite material being prepared2Nano wire mutually wind be staggered into it is porous be similar to bladed structure, nanowire diameter is 10~20nm.Fig. 4 is nitrogen-doped graphene/MnO prepared by the embodiment of the present invention 1~3 and comparative example 1,22Composite material Electrochemical data, by disk electrode test it can be seen that the compound that embodiment 2 obtains has preferable hydrogen reduction catalytic performance: Take-off potential is 0.01V, and half wave potential -0.128V electric current is 1.16mA.
Embodiment 2
Selecting concentration for the graphene oxide water solution and concentration of 2g/L is 80g/L manganese acetate aqueous solution, according to oxidation stone Black alkene is uniformly mixed with manganese acetate mass ratio 1: 25, and 50g/L persulfuric acid is added according to manganese acetate and ammonium persulfate mass ratio 1: 8 Ammonium salt solution, then being reacted 36 hours at a temperature of mixture under hydrothermal conditions 140 DEG C, the product deionized water that will be obtained Washing is for several times until the PH of clear liquid is neutral;Finally by the cold dry end product that obtains of the product washed to get to N doping graphite Alkene/MnO2Composite material.
The pattern of obtained composite material is detected, MnO in composite material2Nano wire mutually wind be staggered into it is porous Similar to bladed structure, nanowire diameter is 10~20nm.By disk electrode test it can be seen that the answering of obtaining of embodiment 1 Closing object has best hydrogen reduction catalytic performance: take-off potential 0.005V, and half wave potential -0.156V electric current is 1.1mA.
Embodiment 3
Selecting concentration for the graphene oxide water solution and concentration of 3g/L is 25g/L manganese acetate aqueous solution, according to oxidation stone Black alkene is uniformly mixed with manganese acetate mass ratio 1: 7, and 30g/L ammonium persulfate is added according to manganese acetate and ammonium persulfate mass ratio 1: 5 Obtained product is washed with deionized water then reacting 24 hours at a temperature of mixture under hydrothermal conditions 160 DEG C for solution It washs for several times until the PH of clear liquid is neutral;Finally by the product washed it is cold it is dry obtain end product to get to nitrogen-doped graphene/ MnO2 composite material.
The pattern of obtained composite material is detected, MnO in composite material2Nano wire mutually wind be staggered into it is porous Similar to bladed structure, nanowire diameter is 10~20nm.By disk electrode test it can be seen that the answering of obtaining of embodiment 1 Closing object has preferable hydrogen reduction catalytic performance: take-off potential is -0.015V, and half wave potential -0.18V electric current is 1.08mA.
Comparative example 1
According to Applied Surface Science, 366 (2016), 552-560, the method for report is prepared nitrogen and mixes Miscellaneous graphene/MnO2Composite material, preparation flow: 1, the uniform mixed liquor of hydrothermal oxidization graphene and ammonium hydroxide, obtains at 120 DEG C To the graphene of N doping;2, the uniform NRGO of 50mg ultrasound is added to 0.25M MnSO4With 0.5M KBrO3Homogeneous solution, Then carrying out power density is 480W cm-2It is 24KHz radioreaction with frequency.
Obtained composite material pattern is detected, as a result sees that Fig. 3, Fig. 3 are that N doping graphite is prepared in comparative example 1 Alkene/MnO2The scanning electron microscope (SEM) photograph of composite material.Fig. 4 is N doping stone prepared by the embodiment of the present invention 1~3 and comparative example 1,2 Black alkene/MnO2The electrochemical data of composite material, by disk electrode test it can be seen that the obtained compound of comparative example 1 have compared with The hydrogen reduction catalytic performance (negative take-off potential, half wave potential and small electric current) of difference.
Comparative example 2
According to the preparation method of embodiment 1, only manganese source compound is changed into manganese nitrate or manganese sulfate, obtain N doping graphite Alkene/MnO2Composite material;
Obtained composite material pattern is detected, Fig. 5 is that nitrogen-doped graphene/MnO2 is prepared is multiple for comparative example 2 The scanning electron microscope (SEM) photograph of condensation material the result shows that, MnO2No longer it is nano wire and is bar-like, compound is also no longer class blade knot Structure.Fig. 4 is nitrogen-doped graphene/MnO prepared by the embodiment of the present invention 1~3 and comparative example 1,22The electrochemistry of composite material Data, by disk electrode test, it can be seen that the compound that comparative example 1 obtains has poor hydrogen reduction catalytic performance, (negative is risen Beginning current potential, half wave potential and the smallest electric current).
The above description of the embodiment is only used to help understand the method for the present invention and its core ideas.It should be pointed out that pair For those skilled in the art, without departing from the principle of the present invention, the present invention can also be carried out Some improvements and modifications, these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims (7)

1. a kind of nitrogen-doped graphene/MnO2Composite material, which is characterized in that described to be compounded on nitrogen-doped graphene lamella MnO2For linear MnO2, the threadiness MnO2Diameter be 10~20nm;
MnO in the composite material2Nano wire mutually wind be staggered into it is porous be similar to bladed structure.
2. a kind of nitrogen-doped graphene/MnO2The preparation method of composite material, comprising:
1) manganese source compound solution and graphene oxide solution are mixed, obtain the first mixed liquor,
The manganese source compound is hydration manganese acetate;
2) ammonium persulfate is added into the first mixed solution, 1~36h of hydro-thermal reaction under the conditions of 80~200 DEG C obtains N doping Graphene/MnO2Composite material.
3. preparation method according to claim 2, which is characterized in that the quality of the graphene oxide and manganese source compound Than for 1:(5~30).
4. preparation method according to claim 2, which is characterized in that the concentration of the graphene oxide solution be 2~ 3.5g/L。
5. preparation method according to claim 2, which is characterized in that the concentration of the manganese source compound solution be 5~ 100g/L。
6. preparation method according to claim 2, which is characterized in that the manganese acetate is with the ammonium persulfate mass ratio 1:(2-10)。
7. preparation method according to claim 2, which is characterized in that the concentration of the ammonium persulfate solution be 10~ 100g/L。
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CN108172408B (en) * 2017-12-27 2020-10-13 合肥工业大学 NH (hydrogen sulfide)2-rGO/MnO2Composite material, preparation method and application
CN109399619B (en) * 2018-12-31 2021-06-04 太原理工大学 Preparation method of nitrogen-doped graphene aerogel
CN114544739B (en) * 2022-01-19 2024-02-23 江苏大学 MnO (MnO) 2 Preparation method of N-doped graphene electrochemical sensor and zinc ion detection application
CN115403093B (en) * 2022-08-30 2023-11-24 扬州大学 SMNG evaporator for solar photo-thermal steam conversion and preparation method

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