CN109728311A - The metal organic framework compound hollow microsphere of load iron cobalt sulfide - Google Patents
The metal organic framework compound hollow microsphere of load iron cobalt sulfide Download PDFInfo
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Abstract
The invention discloses a kind of metal organic framework compound hollow microsphere of load iron cobalt sulfide, preparation method includes: that (1) provides Properties of Polystyrene Nano Particles；(2) it loads on Properties of Polystyrene Nano Particles using Fe, Co as the MOF derivative of metal ion center, i.e. presoma；(3) presoma is calcined and carries out high temperature cabonization, remove Properties of Polystyrene Nano Particles；(4) sulfur doping is carried out to carbonized product.The present invention is that metal ion center and the MOF derivative that is wrapped on Properties of Polystyrene Nano Particles as presoma, then by sulphur atom doping are modified MOF structure using Fe, Co.Gained hollow microsphere specific surface is big, and reactivity attachment site is high, so as to enhance the transmission of electronics and reduzate, can be used as oxygen reduction catalyst.
Description
Technical field
The invention belongs to metal organic framework compound (MOF) derivative synthesis technical fields, and in particular to a kind of load
The metal organic framework compound hollow microsphere of iron cobalt sulfide can be applied to fuel cell ORR catalyst.
Background technique
Fuel cell is a kind of environmental-friendly, efficient new energy, by the oxidized of anode and the oxygen of cathode
Restore two half-reaction compositions.Oxidizing reaction rate is far longer than reduction reaction rate, therefore, improves the oxygen reduction reaction of cathode
Rate is particularly important.And cathode reaction dynamic process is extremely slow, commercial Pt catalyst is expensive at present, becomes
One of the bottleneck of fuel cell large-scale use.The Pt catalyst for thering is studies have shown that fuel battery negative pole to use account for battery at
This about 40%.So research and develop it is cheap, low pollution, the alternative Pt's of catalytic performance, be easy to be mass produced
Fuel battery negative pole oxygen reduction catalyst just seems most important.
In recent years, base metal carbon-supported catalysts were gradually subject to the people's attention.Wherein, with metal organic frame chemical combination
Object (MOFs) is that the research of presoma also increases year by year.There are high density, evenly dispersed active site by MOFs, meanwhile, it is high
Pore structure ensure that the accessible property of each catalytic active center, and compound with regular structure, controllable, be easy to functionalization.From 2011
Since the porous carbon oxygen reduction electro-catalyst that iron is nitrogen co-doped and cobalt is nitrogen co-doped derived from first MOF of report, MOF quilt
Template is widely used as to prepare porous C catalyst.The preparation strategy of its derivative hydridization micro-nano structure has three on the whole
Kind: (1) it is pre-designed MOF composition pattern, then is calcined；(2) MOF base hybrid material is first synthesized, then is prepared through calcination process；(3)
It calcines by presoma of MOF, is then post-processed again.
In short, the key for the ORR catalyst to be had excellent performance be to design and synthesizing activity site dispersion degree it is high,
The porous carbon materials of large specific surface area.
Summary of the invention
The object of the present invention is to provide a kind of metal organic framework compound hollow microspheres of load iron cobalt sulfide.
In order to achieve the above objectives, the present invention adopts the following technical scheme:
A kind of metal organic framework compound hollow microsphere of load iron cobalt sulfide, preparation method include:
(1) Properties of Polystyrene Nano Particles is provided；
(2) it loads on Properties of Polystyrene Nano Particles using Fe, Co as the MOF derivative of metal ion center, i.e. presoma；
(3) presoma is calcined and carries out high temperature cabonization, remove Properties of Polystyrene Nano Particles；
(4) sulfur doping is carried out to carbonized product.
As a preferred solution:
The metal ion of 0.3mol~0.04mol is loaded on every 1g Properties of Polystyrene Nano Particles；High temperature cabonization temperature is 450
~550 degree of degree, carbonization time are 2.5h~3.5h.
Further, Properties of Polystyrene Nano Particles synthesizes with the following method:
Using lauryl sodium sulfate as emulsifier, by initiator and assistant for emulsifying agent, inert atmosphere protects and flows back
Under the conditions of, Properties of Polystyrene Nano Particles is generated by emulsion polymerization method.
The synthesis of Properties of Polystyrene Nano Particles further comprises step:
The aqueous solution that (1a) prepares emulsifier is placed in reaction vessel, is placed in the aqueous solution of emulsifier in inert atmosphere
To remove the polymerization inhibitor in emulsifier；
(1b) is warming up to reflux temperature, instills initiator into reaction vessel at reflux later, and react；
(1c) styrene monomer and assistant for emulsifying agent are added into reaction vessel；
(1d) is warming up to reflux temperature again, reacts at reflux later, is cooled to room temperature after the reaction was completed；
The aqueous solution of inorganic salts is added in reaction vessel and is demulsified by (1e), obtains suspension；
(1f) carries out decompression suction filtration to suspension or centrifuge is centrifuged, and is successively washed again later, depressurizes suction filtration, dries
It does to get Properties of Polystyrene Nano Particles；
The entire synthesis process of Properties of Polystyrene Nano Particles carries out in an inert atmosphere.
Preferably, in the synthesis of Properties of Polystyrene Nano Particles:
Emulsifier, initiator, styrene monomer, assistant for emulsifying agent mass ratio be (1~3): (1~3): 100:(1~2)；
In step (1a), the time for removing the polymerization inhibitor in emulsifier is 25min~35min；
In step (1b), reflux temperature is set as 80 degree~85 degree, reacts duration 10min~20min；
In step (1d), reflux temperature is equally set as 80 degree~85 degree, reacts duration 1.5h~2.5h；
In step (1e), the additional amount of inorganic salts arrives demulsification according to the observation and takes the circumstances into consideration to add.
Further, the aqueous solution of inorganic salts is added in reaction vessel and is demulsified, specifically:
At room temperature, the aqueous solution of inorganic salts is added into reaction vessel in a small amount of multiple method, the water of inorganic salts is added
Solution keeps being stirred liquid in reaction vessel simultaneously；Until precipitating, stop the addition of the aqueous solution of inorganic salts；
20h~30h is stood to be demulsified.
The emulsifier uses lauryl sodium sulfate, and the initiator uses potassium peroxydisulfate or ammonium persulfate, described to help
Emulsifier uses n-butanol, and the aqueous solution of the inorganic salts uses the aqueous solution of potassium chloride.
Further, the molar ratio of Fe and Co is 1:(1~3 in MOF structure).
Further, load is using Fe, Co as the MOF derivative of metal ion center on Properties of Polystyrene Nano Particles, tool
Body are as follows:
(2a) Properties of Polystyrene Nano Particles is scattered in the first dispersing agent, obtains dispersion liquid A；
(2b) disperses source of iron and cobalt source in the second dispersing agent, obtains dispersion liquid B；Second dispersing agent and the first dispersing agent
It is identical；
2-methylimidazole is dissolved in ethyl alcohol by (2c), obtains solution C；
Dispersion liquid B is instilled dispersion liquid A and stirred by (2d), and solution C is added later, is stirred to react；
(2e) successively carries out vacuum rotary steam to reactant solution, is cooled to room temperature, recrystallizes, depressurizing suction filtration, drying, obtains
Product.
Preferably, load is using Fe, Co as the mistake of the MOF derivative of metal ion center on Properties of Polystyrene Nano Particles
Cheng Zhong:
First dispersing agent and the second dispersing agent are deionized water, methanol, ethyl alcohol or DMF；
In step (2d), solution B is instilled into solution A and stirs 30min~60min, solution C is added later, is stirred to react
20h~30h；
The metal ion of 0.3mol~0.04mol, and the use of 2-methylimidazole are loaded on every 1g Properties of Polystyrene Nano Particles
Amount is 0.100mol~0.108mol.The source of iron is FeCl3Or Fe (NO3)3·6H2O；The cobalt source is CoCl2·6H2O or
Co(NO3)2·6H2O。
Further, sulfur doping is carried out to carbonized product, specifically:
By carbonized product and sulphur source ground and mixed, calcined in inert atmosphere later.
The sulphur source is thiocarbamide.
Preferably, the mass ratio of carbonized product and sulphur source is 1:(2~5 in the sulfur doping of carbonized product).
The present invention is by metal ion center of Fe, Co and before the MOF derivative that is wrapped on Properties of Polystyrene Nano Particles is
Body is driven, then MOF structure is modified by sulphur atom doping.
Since MOF and its derivative are mainly connected in a manner of highly organized by metal organic framework and metal ion/cluster
It connects, therefore high temperature cabonization can partially maintain former stephanoporate framework, obtain metal nanoparticle and be coated in porous carbon materials
Nano-complex.To presoma of the present invention, high temperature cabonization can make Properties of Polystyrene Nano Particles be converted to CO or CO2Removing, from
And hollow structure is left in MOF derivative, the pore-creating of MOF derivative is realized, specific surface, the reactivity for increasing MOF are attached
Site, to enhance the transmission of electronics and reduzate.
Detailed description of the invention
Fig. 1 is the XRD characterization figure of 1-1-ZIF@PS-C-S；
Fig. 2 is the XRD characterization figure of 1-2-ZIF@PS-C-S；
Fig. 3 is the XRD characterization figure of 1-3-ZIF@PS-C-S；
The nitrogen saturation that Fig. 4 is 1-1-ZIF@PS-C-S and the CV cyclic voltammogram under oxygen saturation；
The nitrogen saturation that Fig. 5 is 1-2-ZIF@PS-C-S and the CV cyclic voltammogram under oxygen saturation；
The nitrogen saturation that Fig. 6 is 1-3-ZIF@PS-C-S and the CV cyclic voltammogram under oxygen saturation.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
It should be noted that " Properties of Polystyrene Nano Particles " to be abbreviated as to " PS microballoon " hereinafter, by emulsifier " dodecyl
Sodium sulphate " is abbreviated as " SDS ", and initiator " potassium peroxydisulfate " is abbreviated as " KPS ".
Embodiment 1
PS microballoon can directly be bought, and can also voluntarily be prepared, and the present embodiment will provide a kind of preparation method of PS microballoon,
The preparation method of certain PS microballoon is not limited to this.
The step of PS microballoon, is successively as follows in the present embodiment:
(1) 0.3g SDS is dissolved in the deionized water of 180ml, SDS solution is obtained, SDS solution is placed in there-necked flask, and
Polymerization inhibitor in nitrogen removing SDS is led to SDS solution.
(2) SDS solution in there-necked flask is warming up to 80 DEG C, at reflux, it is water-soluble that KPS is quickly instilled into there-necked flask
Liquid, drop finish, and react 15min.The KPS aqueous solution instilled is obtained in the deionized water for 0.3g KPS is added 15ml.
(3) mixed liquor of styrene monomer and n-butanol is slowly added dropwise into there-necked flask, drop finishes, and reacts 30min.The mixing
Liquid is obtained by 0.3g styrene monomer and the mixing of 0.2g n-butanol.
(4) it is added at one time 9.7g styrene monomer into there-necked flask, reacts 2h at reflux.
(5) cooled to room temperature.
(6) at room temperature, Klorvess Liquid is added into there-necked flask in a small amount of multiple method, until there is obvious sediment,
Stop the addition of Klorvess Liquid；It keeps being stirred liquid in there-necked flask while Klorvess Liquid is added.
(7) it stands and is demulsified for 24 hours.
(8) decompression suction filtration is carried out to the suspension obtained after demulsification or centrifuge is centrifuged, later to the white solid of acquisition
It is successively filtered using washing, decompression, drying, white powder product, that is, PS microballoon of acquisition.
(9) the mixed liquor decompression after demulsification is filtered or is centrifuged with centrifuge, obtained white solid is successively with distillation
Twice, decompression filters for water and ethanol washing, drying；The PS microballoon of white powder is obtained, structural formula is
It should be noted that the whole process of synthesis PS microballoon will carry out in inert atmosphere protection.
Embodiment 2-4 will provide the synthetic example of three kinds of presomas, and the molar ratio of Fe, Co are followed successively by three kinds of presomas
1:1,1:2,1:3 are respectively corresponded and are named as 1-1-ZIF@PS, 1-2-ZIF@PS and 1-3-ZIF@PS.
PS microballoon employed in embodiment 2-4 is 1 product of embodiment.
Embodiment 2
The present embodiment will provide the MOF derivative 1-1-ZIF@synthetic example of PS, and steps are as follows:
(1) in there-necked flask, the PS microballoon of 0.27g is dispersed in 5ml deionized water and 20ml ethyl alcohol, 30 DEG C of temperature control,
For mechanical stirring to evenly dispersed, gained dispersion liquid is denoted as dispersion liquid A.
(2) by the FeCl of 0.78g3With the CoCl of 1.142g2·6H2O is dispersed in 15ml ethyl alcohol, gained dispersion liquid
It is denoted as dispersion liquid B.
(3) 2-methylimidazole of 2.362g is dissolved in 25ml ethyl alcohol, acquired solution is denoted as solution C.2-methylimidazole is used
To provide organic ligand to synthesis metal framework compound.
(4) dispersion liquid B is slowly dropped in dispersion liquid A, mixed liquor quickly becomes brown blue in there-necked flask, and to mixing
Liquid is vigorously stirred 30min.
(5) solution C is added at one time in there-necked flask, mixed liquor rapidly goes to brownish black in there-necked flask at this time, stirred
Night reaction.
(6) vacuum rotary steam is carried out to reactant in there-necked flask, after natural cooling, successively carries out ethyl alcohol recrystallization, decompression
It filters, filter cake drying, obtains bluish violet product 1-1-ZIF@PS.
Embodiment 3
The present embodiment will provide the MOF derivative 1-2-ZIF@synthetic example of PS, and steps are as follows:
(1) in there-necked flask, the PS microballoon of 1.08g is dispersed in 10ml deionized water and 50ml ethyl alcohol, 30 DEG C of temperature control,
For mechanical stirring to evenly dispersed, gained dispersion liquid is denoted as dispersion liquid A.
(2) by the FeCl of 1.04g3With the CoCl of 3.05g2·6H2O is dispersed in 45ml ethyl alcohol, gained dispersion liquid note
For dispersion liquid B.
(3) 2-methylimidazole of 9.448g is dissolved in 80ml ethyl alcohol, acquired solution is denoted as solution C.
(4) dispersion liquid B is slowly dropped in dispersion liquid A, mixed liquor quickly becomes brown blue in there-necked flask, and to mixing
Liquid is vigorously stirred 30min.
(5) solution C is added at one time in there-necked flask, mixed liquor rapidly goes to brownish black in there-necked flask at this time, stirred
Night reaction.
(6) vacuum rotary steam is carried out to reactant in there-necked flask, after natural cooling, successively carries out ethyl alcohol recrystallization, decompression
It filters, filter cake drying, obtains bluish violet product 1-1-ZIF@PS.
Embodiment 4
The present embodiment will provide the MOF derivative 1-3-ZIF@synthetic example of PS, and steps are as follows:
(1) in there-necked flask, the PS microballoon of 0.54g is dispersed in 10ml deionized water and 40ml ethyl alcohol, 30 DEG C of temperature control,
For mechanical stirring to evenly dispersed, gained dispersion liquid is denoted as dispersion liquid A.
(2) by the FeCl of 0.78g3With the CoCl of 3.426g2·6H2O is dispersed in 30ml ethyl alcohol, gained dispersion liquid
It is denoted as dispersion liquid B.
(3) 2-methylimidazole of 4.724g is dissolved in 80ml ethyl alcohol, acquired solution is denoted as solution C.
(4) dispersion liquid B is slowly dropped in dispersion liquid A, mixed liquor quickly becomes brown blue in there-necked flask, and to mixing
Liquid is vigorously stirred 30min.
(5) solution C is added at one time in there-necked flask, mixed liquor rapidly goes to brownish black in there-necked flask at this time, stirred
Night reaction.
(6) vacuum rotary steam is carried out to reactant in there-necked flask, after natural cooling, successively carries out ethyl alcohol recrystallization, decompression
It filters, filter cake drying, obtains bluish violet product 1-3-ZIF@PS.
Embodiment 5
The present embodiment will provide the implementation of the high temperature cabonization of presoma 1-1-ZIF@PS, 1-2-ZIF@PS, 1-3-ZIF@PS
Example.
Presoma 1-1-ZIF@PS, 1-2-ZIF@PS and 1-3-ZIF@PS are respectively placed in different porcelain boats, porcelain boat is put
Enter tube furnace, high-temperature calcination is carried out under air atmosphere.Calcine technology parameter are as follows: with 2.5 DEG C/min heating rate by tube furnace
Interior temperature rises to 500 DEG C, and keeps the temperature 3h.Calcining is completed, and through cooled to room temperature, grinds 2h to calcined product using mortar.
Products therefrom, which respectively corresponds, is named as 1-1-ZIF@PS-C, 1-2-ZIF@PS-C, 1-3-ZIF@PS-C.
Embodiment 6
The present embodiment will provide the sulfur doping of carbonized product 1-1-ZIF@PS-C, 1-2-ZIF@PS-C, 1-3-ZIF@PS-C
Embodiment.
1-1-ZIF@PS-C, 1-2-ZIF@PS-C, 1-3-ZIF@PS-C are mixed with thiocarbamide according to the mass ratio of 1:2 respectively
It closes, and is fully ground 4h with mortar, be respectively placed in different porcelain boats later.Porcelain boat is put into tube furnace, in nitrogen atmosphere into
Row high-temperature calcination.Calcine technology parameter are as follows: tubular type in-furnace temperature is risen to 600 DEG C with 2.5 DEG C/min heating rate, and is kept the temperature
3h.Calcining is completed, and through cooled to room temperature, grinds 2h to calcined product using mortar.Products therefrom, which respectively corresponds, to be named as
1-1-ZIF@PS-C-S、1-2-ZIF@PS-C-S、1-3-ZIF@PS-C-S。
Fig. 1 is the XRD characterization figure of 1-1-ZIF@PS-C-S, by right with the JPC-DS card (JCPDS99-0109) of standard
Than, it can be seen that Fig. 1 is iron cobalt sulfide Fe0.8Co0.2S phase, 2 angles θ be iron cobalt sulfide at 29.97 °, 33.90 °, 43.78 °
Fe0.8Co0.2The characteristic peak of S respectively corresponds (200), (201), (202) crystal face, and peak type is sharp, regular, half-peak breadth is relatively narrow, explanation
Crystallinity is fine.There is no miscellaneous peak, illustrates the iron cobalt sulfide Fe for pure phase0.8Co0.2S.The characteristic peak of elemental sulfur is not shown,
Illustrate that sulphur is fully doped and enters lattice, the not remaining sulphur simple substance in surface.Also the not no disperse broad peak of amorphous carbon, explanation
PS microballoon is by except making a gift of to the greatest extent during high temperature cabonization under air atmosphere.
Fig. 2 and Fig. 3 is respectively the XRD characterization figure of 1-2-ZIF@PS-C-S, 1-3-ZIF@PS-C-S, by with standard
JPC-DS card (JCPDS99-0109) comparison, 2 angles θ are to respectively correspond iron cobalt sulfide at 29.97 °, 33.90 °, 43.78 °
Fe0.8Co0.2(200) of S, (201), (202) crystal face.But compared to Figure 1, hence it is evident that find out, with Co content in compound
Increasing, characteristic peak remitted its fury, half-peak breadth increases, illustrate that distortion of lattice degree increases, crystallinity decline, i.e. crystallinity 1-3-ZIF@
PS-C-S<1-2-ZIF@PS-C-S<1-1-ZIF@PS-C-S.In addition, it is metallic cobalt that 2 angles θ, which are corresponding at 45.8 ° and 53.3 °,
The diffraction maximum of nano particle (111), (200) crystal face illustrates compared to Fig. 1, with the increase of Co content, occur in the composite
Cobalt nano-particle.
Embodiment 7
The present embodiment is 1-1-ZIF@PS-C-S, the electrocatalysis characteristic of 1-2-ZIF@PS-C-S, 1-3-ZIF@PS-C-S try
It tests.
Electrocatalysis characteristic test procedure is as follows:
(1) 1-1-ZIF@PS-C-S, 1-2-ZIF@PS-C-S, 1-3-ZIF@PS-C- is respectively adopted in preparation work electrode
S modifies glass-carbon electrode.
The modification of glass-carbon electrode, specifically:
(1a) is cleaned and is polished to glass-carbon electrode；
(1b) weighs 6 product 5mg of embodiment, is added in the centrifuge tube of 2ml.Take the deionization of 80 μ L respectively with liquid-transfering gun
Water, the isopropanol of 900 μ L, 20 μ L nafion, be added centrifuge tube in, ultrasonic 40min, obtain ink；
(1c) in three times with liquid-transfering gun is every time dried in the air the ink droplet of 6 μ L in glassy carbon electrode surface using drop-coating naturally
It is dry.
(2) the present embodiment electrocatalysis characteristic test is all made of three-electrode system, the electrochemical workstation of morning China 660E, the U.S.
Pine rotating disk electrode (r.d.e), pine rotating disk electrode (r.d.e) diameter be 5mm, area 0.19625cm2, reference electrode is saturation
Mercury/mercuric oxide electrode is platinum electrode to electrode, and electrolyte is the KOH solution of 0.1M, is configured using deionized water.
Electrochemical property test is carried out using cyclic voltammetry (CV) and linear sweep voltammetry (LSV).CV experiment condition
Are as follows: the KOH solution of 0.1M prepared using deionized water first leads to N240min reaches saturation, with 0.5VS-1Sweep speed scanning 100
Circle carries out electrode activation；Logical O is changed again240min reaches saturation, with 50mVS-1It sweeps speed and obtains CV figure.LSV experiment condition are as follows: O2
The KOH solution of the 0.1M of saturation sweeps fast 5mVS-1, rotation speed change from high to low, successively 2000rpm, 1600rpm, 1200rpm,
800rpm、400rpm。
CV cyclic voltammetric result is shown in that Fig. 4-6, Fig. 4 are 1-1-ZIF@PS-C-S as catalyst, electrocatalytic oxidation reducing electrode
When CV cyclic voltammogram, it can be seen from the figure that nitrogen saturation electrolyte in there are not redox peaks, in contrast,
In the electrolyte of oxygen saturation, there are apparent redox peaks in the place -0.3V, it was confirmed that 1-1-ZIF@PS-C-S has preferably
The electro catalytic activity to oxygen reduction.Fig. 5 is 1-2-ZIF@PS-C-S as catalyst, CV when electrocatalytic oxidation reducing electrode
Cyclic voltammogram, comparison nitrogen saturation and the CV of oxygen saturation electrolyte scheme, hence it is evident that find out that 1-2-ZIF@PS-C-S also has electricity
Catalytic activity, potential corresponding to peak value are -0.28V.Fig. 6 is 1-3-ZIF@PS-C-S as catalyst, electrocatalytic oxidation reduction
CV cyclic voltammogram when electrode, the CV figure in oxygen saturation electrolyte equally obviously have a redox peaks, and spike potential is-
0.24V。
The oxygen reduction of catalyst cathode is the process that chemical energy is converted to electric energy, the electricity of reduction corresponding to reduction peak
Position is bigger, then the catalytic activity of elctro-catalyst is better.Therefore, 1-1-ZIF@PS-C-S, 1-2-ZIF@PS-C-S, 1-3-ZIF@
The electro catalytic activity sequence of PS-C-S are as follows: 1-3-ZIF@PS-C-S > 1-2-ZIF@PS-C-S > 1-1-ZIF@PS-C-S.Compare XRD
The analysis of figure is as a result, illustrate that metal organic framework compound hollow microsphere of the present invention has good ORR activity, and increase Co gold
Metal nano-particle dosage can effectively improve its catalytic activity.
LSV cyclic voltammetric the results are shown in Table 1, spread electricity for the limit of the glass-carbon electrode after catalyst modification under different rotating speeds
Current density (unit: mA/cm-2).LSV polarization curve data reflect the power of Cathodic oxygen reduction.Platform is spread in the limit
Area, Limited diffusion current density is bigger, then hydrogen reduction power is more sufficient.As can be seen from Table 1, for same catalyst, with
Revolving speed increase, Limited diffusion current density increases therewith, this similarly proved in CV cyclic voltammetric result about this three
Kind catalyst all has the active conclusion of preferable ORR.When the revolving speed of rotating disk electrode (r.d.e) is 1600rpm, commercial noble metal
The theoretical limit diffusion current density of catalyst platinum carbon is 6mA/cm-2.The limit of catalyst of the present invention at 1600 rpm is compared to expand
Current density is dissipated, the Limited diffusion current density of 1-1-ZIF@PS-C-S is 3.2mA/cm-2, the limit of 1-2-ZIF@PS-C-S
Diffusion current density is 3.6mA/cm-2, and the Limited diffusion current density of 1-3-ZIF@PS-C-S is 4.1mA/cm-2.It can be seen that
The electro catalytic activity sequence of 1-1-ZIF@PS-C-S, 1-2-ZIF@PS-C-S, 1-3-ZIF@PS-C-S are as follows: 1-3-ZIF@PS-C-S
>1-2-ZIF@PS-C-S>1-1-ZIF@PS-C-S.This also demonstrates the analysis result of CV cyclic voltammetric result: this hair of the present invention
Bright metal organic framework compound hollow microsphere has good ORR activity, and increase Co metal nanoparticle content can have
Effect improves its catalytic activity.
The Limited diffusion current density of glass-carbon electrode after the modification of 1 catalyst of table
| 400rpm | 800rpm | 1200rpm | 1600rpm | 2000rpm | |
| 1-1-ZIF@PS-C-S | 2.6mA/cm-2 | 2.8mA/cm-2 | 3.1mA/cm-2 | 3.2mA/cm-2 | 3.5mA/cm-2 |
| 1-2-ZIF@PS-C-S | 2.4mA/cm-2 | 2.9mA/cm-2 | 3.4mA/cm-2 | 3.6mA/cm-2 | 3.9mA/cm-2 |
| 1-3-ZIF@PS-C-S | 3mA/cm-2 | 3.3mA/cm-2 | 3.8mA/cm-2 | 4.1mA/cm-2 | 4.3mA/cm-2 |
Although above the present invention is described in detail with a general description of the specific embodiments,
On the basis of the present invention, it can be made some modifications or improvements, this will be apparent to those skilled in the art.Cause
This, these modifications or improvements, fall within the scope of the claimed invention without departing from theon the basis of the spirit of the present invention.
Claims (10)
1. a kind of metal organic framework compound hollow microsphere of load iron cobalt sulfide, characterized in that preparation method includes:
(1) Properties of Polystyrene Nano Particles is provided；
(2) it loads on Properties of Polystyrene Nano Particles using Fe, Co as the MOF derivative of metal ion center, i.e. presoma；
(3) presoma is calcined and carries out high temperature cabonization, remove Properties of Polystyrene Nano Particles；
(4) sulfur doping is carried out to carbonized product.
2. the metal organic framework compound hollow microsphere of load iron cobalt sulfide as described in claim 1, it is characterized in that:
Properties of Polystyrene Nano Particles synthesizes with the following method:
Using lauryl sodium sulfate as emulsifier, by initiator and assistant for emulsifying agent, in the condition that inert atmosphere is protected and flowed back
Under, Properties of Polystyrene Nano Particles is generated by emulsion polymerization method.
3. the metal organic framework compound hollow microsphere of load iron cobalt sulfide as claimed in claim 2, it is characterized in that:
The synthesis of Properties of Polystyrene Nano Particles further comprises step:
The aqueous solution that (1a) prepares emulsifier is placed in reaction vessel, is placed in the aqueous solution of emulsifier in inert atmosphere to go
Except the polymerization inhibitor in emulsifier；
(1b) is warming up to reflux temperature, instills initiator into reaction vessel at reflux later, and react；
(1c) styrene monomer and assistant for emulsifying agent are added into reaction vessel；
(1d) is warming up to reflux temperature again, reacts at reflux later, is cooled to room temperature after the reaction was completed；
The aqueous solution of inorganic salts is added in reaction vessel and is demulsified by (1e), obtains suspension；
(1f) carries out decompression suction filtration to suspension or centrifuge is centrifuged, and is successively washed again later, depressurizes suction filtration, drying, i.e.,
Obtain Properties of Polystyrene Nano Particles；
The entire synthesis process of Properties of Polystyrene Nano Particles carries out in an inert atmosphere.
4. the metal organic framework compound hollow microsphere of load iron cobalt sulfide as claimed in claim 3, it is characterized in that:
The aqueous solution by inorganic salts, which is added in reaction vessel, to be demulsified, specifically:
At room temperature, the aqueous solution of inorganic salts is added into reaction vessel in a small amount of multiple method, the aqueous solution of inorganic salts is added
It keeps being stirred liquid in reaction vessel simultaneously；Until precipitating, stop the addition of the aqueous solution of inorganic salts；
Standing is demulsified.
5. the metal organic framework compound hollow microsphere of load iron cobalt sulfide as claimed in claim 3, it is characterized in that:
The emulsifier uses lauryl sodium sulfate, and the initiator uses potassium peroxydisulfate or ammonium persulfate, described to help emulsification
Agent uses n-butanol, and the aqueous solution of the inorganic salts uses the aqueous solution of potassium chloride.
6. the metal organic framework compound hollow microsphere of load iron cobalt sulfide as described in claim 1, it is characterized in that:
The molar ratio of Fe and Co is 1:(1-3 in the MOF structure).
7. the metal organic framework compound hollow microsphere of load iron cobalt sulfide as described in claim 1, it is characterized in that:
It is loaded on Properties of Polystyrene Nano Particles using Fe, Co as the MOF derivative of metal ion center, specifically:
(2a) Properties of Polystyrene Nano Particles is scattered in the first dispersing agent, obtains dispersion liquid A；
(2b) disperses source of iron and cobalt source in the second dispersing agent, obtains dispersion liquid B；Second dispersing agent and the first dispersing agent phase
Together；
2-methylimidazole is dissolved in ethyl alcohol by (2c), obtains solution C；
Dispersion liquid B is instilled dispersion liquid A and stirred by (2d), and solution C is added later, is stirred to react；
(2e) successively carries out vacuum rotary steam to reactant solution, is cooled to room temperature, recrystallizes, depressurizing suction filtration, drying, is produced
Object.
8. the metal organic framework compound hollow microsphere of load iron cobalt sulfide as claimed in claim 7, it is characterized in that:
The source of iron FeCl3Or Fe (NO3)3·6H2O；The cobalt source is CoCl2·6H2O or Co (NO3)2·6H2O。
9. the metal organic framework compound hollow microsphere of load iron cobalt sulfide as described in claim 1, it is characterized in that:
Sulfur doping is carried out to carbonized product, specifically:
By carbonized product and sulphur source ground and mixed, calcined in inert atmosphere later.
10. the metal organic framework compound hollow microsphere of load iron cobalt sulfide as claimed in claim 9, it is characterized in that:
The sulphur source is thiocarbamide.
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