CN107126974B - ZIF-67 modifies Fe3O4The preparation of@PZS core-shell particles and its application of ORR catalyst - Google Patents

ZIF-67 modifies Fe3O4The preparation of@PZS core-shell particles and its application of ORR catalyst Download PDF

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CN107126974B
CN107126974B CN201710423396.4A CN201710423396A CN107126974B CN 107126974 B CN107126974 B CN 107126974B CN 201710423396 A CN201710423396 A CN 201710423396A CN 107126974 B CN107126974 B CN 107126974B
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core
pzs
shell particles
zif
preparation
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CN107126974A (en
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马贵平
许艳婷
聂俊
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Changzhou Institute for Advanced Materials Beijing University of Chemical Technology
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Changzhou Institute for Advanced Materials Beijing University of Chemical Technology
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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
    • B01J31/00Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/26Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24
    • B01J31/28Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24 of the platinum group metals, iron group metals or copper
    • B01J35/33
    • B01J35/398

Abstract

The present invention relates to the Fe of ZIF-67 modification3O4The preparation of@PZS core-shell particles and its application as ORR catalyst, the present invention prepare Fe using solvent-thermal method3O4Magnetic microsphere, and Fe is prepared using condensation methods as core3O4@PZS core-shell particles realize ZIF-67 to Fe using in situ synthesis3O4The modification of@PZS core-shell particles.The magnetic microsphere of preparation is doped with Fe, Co, N, P and S multiple element, has good ORR catalytic activity, preferable cyclical stability and methanol tolerant, can be absorbed by magnet and repeatedly be recycled.

Description

ZIF-67 modifies Fe3O4The preparation of@PZS core-shell particles and its application of ORR catalyst
Technical field
The present invention relates to magnetic core-shell field of nanometer material technology and ORR catalytic field, are specifically prepared using solvent-thermal method Surface has the Fe of hydroxyl and carboxyl modified3O4Magnetic microsphere, and Fe is prepared using condensation methods as core3O4@PZS nucleocapsid Microballoon realizes ZIF-67 to Fe using in situ synthesis3O4The modification of@PZS core-shell particles is adulterated using polyatom and improves its ORR Catalytic activity.
Background technique
The dynamics of redox reaction (ORR) is very slow, limits the electrochemistry such as fuel cell and metal-air battery Conversion and storage device, although platinum and its alloy are considered as best ORR catalyst, expensive price, lower storage Key issues of storage, poor durability, easy methanol poisoning effect, hinders its large-scale practical application.Therefore, it is necessary to The higher non-precious metal catalyst of a kind of catalytic activity is developed to replace platinum catalyst.
Fe3O4Nanoparticle be it is a kind of be readily synthesized and surface-functionalized nano magnetic material, there is good biology Compatibility, biological degradability, low toxicity, repeatable the advantages that recycling, it is widely used in the fields such as biomedical engineering, army The fields such as thing, protection, catalysis.Currently, preparation Fe3O4There are many method of microballoon, mainly have coprecipitation, microemulsion method, hydro-thermal/ Solvent-thermal method, high-temperature decomposition, sonochemical method, electrochemical process and colloidal sol~gel method.The present invention mainly uses solvent-thermal method Synthesize Fe3O4Microballoon.
Metal-organic framework (Metal-Orgaic Frameworks), abbreviation MOFs, be by organic ligand and metal from The hybrid inorganic-organic materials with molecule inner pore that son or cluster are self-assembly of by coordinate bond.It is organic in MOFs The arrangement of ligand and metal ion or cluster has apparent directionality, different frame pore structures can be formed, thus table Reveal different absorption properties, optical property, electromagnetic property etc., MOFs shows huge hair in terms of modern materials science Open up potentiality and tempting development prospect.
Summary of the invention
The object of the present invention is to provide a kind of simple synthetic method preparation ZIF-67 to modify Fe3O4@PZS core-shell particles, and It is used as ORR catalyst.
To achieve the goals above, the present invention takes following technical scheme:
The first, Fe3O4The preparation of@PZS core-shell particles
5~25mg hexachlorocyclotriph,sphazene is added in single neck bottle of 50mL, 25.2~126mg is to hydroxyl diphenyl sulphone (DPS), and 30.2 The Fe that~151mg is 100~300nm by diameter prepared by solvent-thermal method3O4, 50mL acetonitrile or acetone are as solvent, ultrasound 10min be completely dissolved with it is evenly dispersed.Then it is sealed with rubber stopper, inject 0.5mL triethylamine rapidly with syringe or rubbed together Other tertiary amines (tri-n-butyl amine or trioctylphosphine amine) of your amount are used as acid binding agent, and 10s~1min is (slightly poor according to solvent difference Not, acetonitrile internal ratio is very fast, slow in acetone), form white emulsion.Then 50Hz ultrasound, the reaction was continued 3 hours, then 8000rpm is centrifuged 10min, is washed 2 times with acetone, ethyl alcohol and deionized water respectively, final product is 40 DEG C in vacuum drying oven It is dry.The second, ZIF-67 is to Fe3O4The modification of@PZS core-shell particles:
Take 10~60mg Fe3O4@PZS core-shell particles are dispersed in 10mL and contain 145.5~1455.1mg Co (NO3)2· 6H2In the methanol solution of O, it is molten that the methanol that 10mL contains 82.1~821.0mg 2-methylimidazole is added after 30min for ultrasonic disperse Liquid stands 30min at room temperature, then collects particle with magnet, with ethanol washing 2 times, final product is 40 in vacuum drying oven DEG C drying.
ZIF-67 modifies Fe3O4Application of the@PZS core-shell particles as ORR catalyst, method particularly includes:
The first, by the microballoon of synthesis in tube furnace 800~1000 DEG C of 1~3h of carbonization treatment under nitrogen atmosphere;
The second, the sample for taking 5.0mg step 1 to obtain, is added 1mL ethyl alcohol and 100 μ L mass fractions are 10% Nafion solution, ultrasonic 30min, makes it be uniformly dispersed, and obtains catalyst solution;
Third tests its ORR catalytic activity, cyclical stability and methanol tolerant, electrolyte O with electrochemical workstation2 The 0.1M KOH of saturation, 5~10mV of sweep speed s-1, rotation speed 400-2500rpm.Compared with prior art, of the invention The advantages of be:
Preparation method of the invention is simple, and raw material is cheap and easy to get, and it is more that the magnetic microsphere of preparation is doped with Fe, Co, N, P and S Kind element, has good ORR catalytic performance, preferable cyclical stability and methanol tolerant, can be absorbed by magnet and repeatedly be returned It receives and utilizes.
Detailed description of the invention
Fig. 1 is the Fe prepared in embodiment 13O4The TEM of@PZS core-shell particles schemes.
Fig. 2 is the Fe of the ZIF-67 modification prepared in embodiment 13O4The TEM of@PZS core-shell particles schemes.
Fig. 3 is the Fe of the ZIF-67 modification prepared in embodiment 13O4The LSV curve of@PZS core-shell particles.
Fig. 4 is the Fe of the ZIF-67 modification prepared in embodiment 13O4The stable circulation linearity curve of@PZS core-shell particles.
Fig. 5 is the Fe of the ZIF-67 modification prepared in embodiment 13O4The methanol tolerant stability curve of@PZS core-shell particles.
Specific embodiment
The present invention presented below-ZIF-67 modifies Fe3O4The application of the preparation and its ORR catalyst of@PZS core-shell particles Specific embodiment.
Embodiment 1
10mg hexachlorocyclotriph,sphazene is added in single neck bottle of 50mL, 50.4mg is to hydroxyl diphenyl sulphone (DPS), and 60.4mg is by solvent The Fe of the diameter about 250nm of thermal method preparation3O4, as solvent, ultrasonic 10min is completely dissolved and uniformly for 50mL acetonitrile or acetone Dispersion.Then it is sealed with rubber stopper, injects 0.5mL triethylamine rapidly with syringe or (three just with other tertiary amines of mole Butylamine or trioctylphosphine amine) be used as acid binding agent, about 10s~1min (difference is slightly had according to solvent difference, acetonitrile internal ratio is very fast, It is slow in acetone), form white emulsion.Then 50Hz ultrasound, the reaction was continued 3 hours, and then 8000rpm is centrifuged 10min and receives Collect particle, is washed 2 times with acetone, ethyl alcohol and deionized water respectively, the 40 DEG C of dryings in vacuum drying oven of final product.
Take 30mg Fe3O4@PZS core-shell particles are dispersed in 10mL and contain 291.0mg Co (NO3)2·6H2The methanol solution of O In, the methanol solution that 10mL contains 410.5mg 2-methylimidazole is added after 30min, stands 30min at room temperature for ultrasonic disperse, Then 8000rpm is centrifuged 10min, with ethanol washing 2 times, the 40 DEG C of dryings in vacuum drying oven of final product.
The Fe of ZIF-67 modification3O4@PZS core-shell particles 800 DEG C of carbonization treatment 1h under nitrogen atmosphere in tube furnace.It takes The sample that 5.0mg is carbonized, is added the Nafion solution of 1mL ethyl alcohol and 100 μ L 5%, and ultrasonic 30min keeps its dispersion equal It is even, obtain catalyst solution.
Its ORR catalytic activity, cyclical stability and methanol tolerant, electrolyte O are tested with electrochemical workstation2Saturation 0.1M KOH, sweep speed 10mV s-1, rotation speed 1600rpm.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art Member, without departing from the inventive concept of the premise, can also make several improvements and modifications, these improvements and modifications also should be regarded as In protection scope of the present invention.

Claims (2)

1.ZIF-67 modifies Fe3O4The preparation method of@PZS core-shell particles, which comprises the following steps:
The first, Fe3O4The preparation of@PZS core-shell particles: addition 5 ~ 25mg hexachlorocyclotriph,sphazene in single neck bottle of 50mL, 25.2 ~ 126mg is to hydroxyl diphenyl sulphone (DPS), the Fe that 30.2 ~ 151mg is 100 ~ 300nm by diameter prepared by solvent-thermal method3O4, 50mL acetonitrile or Person's acetone as solvent, ultrasonic 10min be completely dissolved with it is evenly dispersed, then sealed with rubber stopper, injected rapidly with syringe For 0.5mL triethylamine as acid binding agent, 10s ~ 1min forms white emulsion, then 50Hz ultrasound, the reaction was continued 3 hours, then 8000rpm is centrifuged 10min, is washed 2 times with acetone, ethyl alcohol and deionized water respectively, final product is 40 °C in vacuum drying oven It is dry;
The second, ZIF-67 is to Fe3O4The modification of@PZS core-shell particles: 10 ~ 60mg Fe is taken3O4@PZS core-shell particles are dispersed in 10mL Contain 145.5 ~ 1455.1mg Co (NO3)2•6H2In the methanol solution of O, ultrasonic disperse, be added after 30min 10mL contain 82.1 ~ The methanol solution of 821.0mg 2-methylimidazole stands 30min at room temperature, then particle is collected with magnet, with ethanol washing 2 It is secondary, the 40 °C of dryings in vacuum drying oven of final product.
2. the ZIF-67 that preparation method as described in claim 1 obtains modifies Fe3O4@PZS core-shell particles are as ORR catalyst Application, which is characterized in that specific steps are as follows:
The first, by the microballoon of synthesis in tube furnace 800 ~ 1000 DEG C of 1 ~ 3h of carbonization treatment under nitrogen atmosphere;
The second, the Nafion solution that 1mL ethyl alcohol and 100 μ L mass fractions are 10% is added in the sample for taking 5.0mg step 1 to obtain, Ultrasonic 30min, makes it be uniformly dispersed, and obtains catalyst solution;
Third tests its ORR catalytic activity, cyclical stability and methanol tolerant, electrolyte O with electrochemical workstation2Saturation 0.1 M KOH, 5 ~ 10 mVs of sweep speed−1, rotation speed is 400-2500 rpm.
CN201710423396.4A 2017-06-07 2017-06-07 ZIF-67 modifies Fe3O4The preparation of@PZS core-shell particles and its application of ORR catalyst Active CN107126974B (en)

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CN109065895A (en) * 2018-07-26 2018-12-21 北京化工大学常州先进材料研究院 The preparation of iron cobalt codope carbon nitrogen core-shell particles material and its application in terms of electro-catalysis
CN108752637B (en) * 2018-08-01 2020-02-14 河北大学 ZIF-8 packaged hexachlorocyclotriphosphazene flame retardant, preparation method and application thereof, and flame-retardant epoxy resin
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CN110459776A (en) * 2019-08-02 2019-11-15 北京化工大学常州先进材料研究院 The preparation of FeCo hollow carbon micro-sphere material and its application in terms of electro-catalysis
CN110452547B (en) * 2019-08-26 2020-07-03 北京理工大学 ZIF-67\ polysulfone sphere flame retardant and preparation method thereof
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