CN110380069A - A kind of noble metal catalyst of active carbon confinement and preparation method thereof and application - Google Patents
A kind of noble metal catalyst of active carbon confinement and preparation method thereof and application Download PDFInfo
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- CN110380069A CN110380069A CN201910661474.3A CN201910661474A CN110380069A CN 110380069 A CN110380069 A CN 110380069A CN 201910661474 A CN201910661474 A CN 201910661474A CN 110380069 A CN110380069 A CN 110380069A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/90—Selection of catalytic material
- H01M4/92—Metals of platinum group
- H01M4/921—Alloys or mixtures with metallic elements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/90—Selection of catalytic material
- H01M4/92—Metals of platinum group
- H01M4/925—Metals of platinum group supported on carriers, e.g. powder carriers
- H01M4/926—Metals of platinum group supported on carriers, e.g. powder carriers on carbon or graphite
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
The present invention provides a kind of preparation methods of the noble metal catalyst of active carbon confinement.The present invention makes the cluster containing metal salt and ligand be easy to be adsorbed by conductive black using amphiphilic and to noble metal and alloy ion complexing possessed by organic micromolecule ligand.The metal salt cluster adsorbed by conductive black hole forms confinement space, forms little particle in calcination process and can not further reunite, nano particle between the noble metal and its metal so as to synthesize 2~5nm.The confinement space promotes the local concentration of reaction substrate further to obtain the catalytic activity of higher fuel cell oxygen reduction.And the experiment synthesizing mean of formation and the high-temperature calcination of confinement space greatly improves the stability of catalyst.In addition, process route of the invention is simple, synthesis device is simple, low in cost, is suitable for large-scale industrial production.
Description
Technical field
The invention belongs to fuel cell catalyst technical fields, and in particular to a kind of noble metal catalyst of active carbon confinement
And preparation method thereof and application.
Background technique
In recent years, as the problem of environmental pollution got worse for rapidly depleting and its causing of fossil energy promotes people
New green energy resource and its transformation system are explored and study, to obtain the sustainability of harmony between man and nature coexistence and society
Development.Thus, various novel electrochemical energies have obtained extensive attention and development, especially fuel cell, metal-air
New generation of green energy such as battery etc..In these new energy batteries, noble metal catalyst plays the role that do not replace.
Therefore the cost for how reducing noble metal catalyst, the emphasis that increasing its activity and stability becomes in new energy research are led
Domain.
Therefore develop a kind of high-performance, low noble metal carrying capacity, high stability noble metal catalyst be applied to electrochemical energy
Become particularly significant in the new generation of green energy conversion device such as source storage and conversion field, especially fuel cell.
Such as the mass activity of Pt can be significantly increased using such as Pt nanometers of frame structure of noble metal, increase the work of catalyst
Property area.And such as PtxFe of the alloy based on noble metal is used, noble metal in catalyst can be also greatly reduced in PtxCo, PtxNi
Dosage, more conducively large-scale industrial production.
However up to the present the catalytic performance of noble metal catalyst and stability still not satisfy industrial demand.
This is primarily due to the intermetallic compound that more difficult synthesis pattern single-size is less than 5nm, and synthesis (needs to be higher than 700 degree of calcinings)
Reunion inactivation is easy to happen with catalyst in catalytic process, and it is all that noble metal catalyst does not cause closely to fall off in conjunction with carbon material etc.
It is multifactor, so that industrial difficulty and cost be significantly greatly increased.
In addition, in presently disclosed few noble metal fuel cell catalyst, in order to improve noble metal catalyst
Catalytic efficiency, people often select synthesis to have the noble metal nanometer material of specific morphology, ignore between catalyst and carrier
Association, to lead to the activity actually promoted and stability not due to the presence of gas-solid-liquid three phase boundary after being assembled into battery
It is ideal.
Therefore, studying and prepare a kind of active carbon confinement noble metal and its alloy catalyst has highly important reality meaning
Justice.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is that provide a kind of active carbon confinement noble metal catalyst and
The noble metal catalyst of preparation method and application, active carbon confinement provided by the invention has preferable fuel cell oxygen also
The catalytic performance of original reaction and stability and application.
The present invention provides a kind of preparation methods of the noble metal catalyst of active carbon confinement, comprising the following steps:
A) precious metal salt, organic micromolecule ligand, activated carbon black and organic solvent dispersion are mixed, obtain black colloid；
B) the black colloid is thermally dried, obtains presoma；
C) presoma is calcined, obtains noble metal catalyst.
Preferably, step A) carry out dispersion mixing when, further include base metal salt, the base metal salt include molysite,
One of cobalt salt, nickel salt, mantoquita, manganese salt are a variety of, and the molar ratio of the base metal salt and the noble metal is (0~3):
1。
Preferably, the precious metal salt be selected from one of platinum salt, palladium salt, ruthenium salt, iridium salt, rhodium salt, gold salt and silver salt or
It is a variety of；
The activated carbon black include conductive black, carbonaceous mesophase spherules, acetylene black, active carbon, nanotube, carbon nanocoils,
One of carbon fiber, electrically conductive graphite and Super P or a variety of；
The organic micromolecule ligand includes one of dicyanodiamine, tetrabutylammonium iodide and Phen or a variety of；
The organic solvent includes one of alcohols solvent, acetone, hexamethylene and pentane or a variety of.
Preferably, the molar ratio of the organic molecules-ligands and the precious metal salt is (1~10): 1；
The mass ratio of the active carbon material and the precious metal salt is (2~100): 1；
The mass ratio of the organic solvent and the precious metal salt is (5~400): 1；
The mass ratio of the water and the organic solvent is (0~500): 1.
Preferably, step A) are as follows:
Precious metal salt, organic micromolecule ligand are mixed and are scattered in organic solvent, dispersion liquid is obtained；
Activated carbon black is mixed with the dispersion liquid, absorption ageing is stirred, obtains black colloid.
Preferably, the stirring and adsorbing ageing is logical oxygen stirring ageing, and the temperature of the stirring and adsorbing ageing is 15~35
DEG C, the time is 8~40 hours.
Preferably, the temperature of the heat drying is 30~60 DEG C, and the time is 2~3 days.
Preferably, the temperature of the calcining is 700~1000 DEG C；The time of the calcining is 1~3 hour.
The present invention also provides a kind of noble metal catalyst of the active carbon confinement of above-mentioned preparation method preparation, feature exists
In general formula are as follows: (NMx)-C；
Wherein, N is noble metal, and M is base metal, and C is carbon carrier；X=(0~1)；
The precious metal element and non-noble metal j element are bonded on the carbon carrier.
The present invention also provides a kind of new energy battery, the noble metals of the active carbon confinement including the preparation of above-mentioned preparation method
Catalyst.
Compared with prior art, the present invention provides a kind of preparation method of the noble metal catalyst of active carbon confinement, packets
Include following steps: A) precious metal salt, organic micromolecule ligand, activated carbon black and organic solvent dispersion are mixed, obtain black glue
Body；B) the black colloid is thermally dried, presoma is obtained, obtains presoma；C) presoma is calcined,
Obtain noble metal catalyst.
The present invention utilizes complexing work amphiphilic possessed by organic micromolecule ligand and to noble metal and alloy ion
With, make the cluster containing metal salt and ligand be easy adsorbed by conductive black.The metal adsorbed by conductive black hole
Salt cluster forms confinement space, forms little particle in calcination process and can not further reunite, so as to synthesize 2~5nm
Noble metal and its metal between nano particle.Obtained catalyst material is because of confinement space part with higher in the reaction
The catalytic activity of reaction density and higher fuel cell oxygen reduction.And the experiment of formation and the high-temperature calcination of confinement space is closed
The stability of catalyst is greatly improved at means.Further inventive of the present invention by adjusting different noble metal source and ligand
A variety of different precious metal alloys and various sizes of nanoparticle catalyst material can be synthesized, its oxygen reduction reaction is made
Mass activity is further promoted.In addition, process route of the invention is simple, synthesis device is simple, low in cost, is applicable in
In large-scale industrial production.
Detailed description of the invention
Fig. 1 is the XRD diffraction pattern of the noble metal catalyst of active carbon confinement prepared by the embodiment of the present invention 1；
Fig. 2 is the TEM electromicroscopic photograph of the noble metal catalyst of active carbon confinement prepared by the embodiment of the present invention 1；
Fig. 3 is that linear voltammetric scan figure is precipitated in the electrocatalytic oxidation reduction of sample prepared by the embodiment of the present invention 1 and oxygen；
Fig. 4 is the XRD diffraction pattern of the intermetallic catalyst of active carbon confinement prepared by the embodiment of the present invention 2；
Fig. 5 is the TEM electromicroscopic photograph of the intermetallic catalyst of active carbon confinement prepared by the embodiment of the present invention 2；
Fig. 6 is the EDS mapping Elemental redistribution of the intermetallic catalyst of active carbon confinement prepared by the embodiment of the present invention 2
Electromicroscopic photograph；
Fig. 7 is the electrocatalytic oxidation reduction and oxygen analysis of the intermetallic catalyst of active carbon confinement prepared by the embodiment of the present invention 3
Linear voltammetric scan figure out；
Fig. 8 is that the electrocatalytic oxidation of the intermetallic catalyst of active carbon confinement prepared by the embodiment of the present invention 3 restores constant potential
The stability test of catalysis；
Fig. 9 is the XRD diffraction pattern of the noble metal catalyst of active carbon confinement prepared by the embodiment of the present invention 4；
Figure 10 is the TEM electromicroscopic photograph of the noble metal catalyst of active carbon confinement prepared by the embodiment of the present invention 4；
Figure 11 is the XRD diffraction pattern of the noble metal catalyst of active carbon confinement prepared by the embodiment of the present invention 5；
Figure 12 is the TEM electromicroscopic photograph of the noble metal catalyst of active carbon confinement prepared by the embodiment of the present invention 5.
Specific embodiment
The present invention provides a kind of preparation methods of the noble metal catalyst of active carbon confinement, comprising the following steps:
A) precious metal salt, organic micromolecule ligand, activated carbon black and organic solvent dispersion are mixed, obtain black colloid；
B) the black colloid is successively thermally dried, obtains presoma；
C) presoma is calcined, obtains noble metal catalyst.
The present invention first mixes precious metal salt, organic micromolecule ligand, activated carbon black and organic solvent dispersion, obtains black
Coloring agent body.
The mode of the dispersion is not particularly limited in the present invention, is with dispersing mode well known to those skilled in the art
Can, those skilled in the art can select and adjust, this hair according to practical condition, raw material condition and product requirement
Bright is the fully dispersed of guarantee active carbon material, and the mode of the dispersion is preferably dispersed with stirring.The present invention is to the dispersion
Time is not particularly limited, and with jitter time well known to those skilled in the art, those skilled in the art can be according to reality
The border condition of production, raw material condition and product requirement are selected and are adjusted, and the present invention is to guarantee precious metal salt and base metal
Salt it is fully dispersed, the time of the dispersion is preferably 1~4h, more preferably 2~3h.
Temperature locating for above-mentioned all dispersion processes is not particularly limited in the present invention, with well known to those skilled in the art
Dispersion temperature, those skilled in the art can select according to practical condition, raw material condition and product requirement
And adjustment, the temperature of the present invention being dispersed with stirring are preferably 10~35 DEG C, more preferably 10~30 DEG C, most preferably 10~20
℃。
Wherein, the precious metal salt be selected from noble metal soluble-salt, the precious metal salt be selected from platinum salt, palladium salt, ruthenium salt,
One of iridium salt, rhodium salt, gold salt and silver salt are a variety of；Preferably include 4 valence solubility platinum salts and trivalent solubility ruthenium salt and iridium
Salt is specifically as follows chloroplatinic acid, ruthenic chloride, one of iridium chloride or a variety of.
The activated carbon black include conductive black, carbonaceous mesophase spherules, acetylene black, active carbon, nanotube, carbon nanocoils,
One of carbon fiber, electrically conductive graphite and Super P or a variety of, preferably conductive black.
The organic micromolecule ligand includes one of dicyanodiamine, tetrabutylammonium iodide and Phen or a variety of；
Organic solvent of the present invention preferably includes one of alcohols solvent, acetone, hexamethylene and pentane or a variety of,
More preferably alcohols solvent, acetone, hexamethylene or pentane, more preferably ethyl alcohol.
The molar ratio of the organic molecules-ligands and the precious metal salt is (1~10): 1, preferably (3~7): 1, into one
Step is preferably (2~5): 1, more preferably (2~4): 1, most preferably (2.5~3): 1；
The mass ratio of the active carbon material and the precious metal salt is (2~100): 1, preferably (10~80): 1, more
Preferably (30~60): 1；
The mass ratio of the organic solvent and the precious metal salt is (5~400): 1, preferably (50~300): 1, it is more excellent
It is selected as (100~200): 1；
The mass ratio of the water and the organic solvent is (0~500): 1, preferably (100~400): 1, more preferably
(200~300): 1.
In order to improve dispersion mixing, the black colloid is prepared as follows:
The present invention, which mixes precious metal salt, organic micromolecule ligand, to be scattered in organic solvent, and dispersion liquid is obtained；
Above-mentioned steps carry out dispersion mixing when, further include base metal salt, the base metal salt include molysite, cobalt salt,
One of nickel salt, mantoquita, manganese salt are a variety of, and the molar ratio of the base metal salt and the noble metal is (0~3): 1, it is excellent
It is selected as (0.5~2.5): 1, more preferably (1.0~2.0): 1.
Activated carbon black is mixed with the dispersion liquid, absorption ageing is stirred, obtains black colloid.
Specifically, the stirring and adsorbing ageing is logical oxygen stirring ageing, the temperature of the stirring and adsorbing ageing is 15~35
DEG C, preferably 20~30 DEG C, the time is 8~40 hours, preferably 10~30 hours, further preferably 15~25 hours.
The mass ratio of the sum of active carbon material of the present invention and the precious metal salt and base metal salt is preferably (1000
~4000): 100, more preferably (1500~3000): 100, most preferably (2000~2500): 100.
Then, the black colloid is successively subjected to heating stirring drying, obtains presoma.
In the present invention, the drying is preferably that agitating and heating is dry.The present invention mode dry to the heating stirring
It is not particularly limited, with drying mode well known to those skilled in the art, those skilled in the art can be according to practical life
Situation, raw material condition and product requirement is produced to be selected and adjusted, the present invention is the heating stirring drying effect for guaranteeing product,
The temperature of the drying is 30~60 DEG C, preferably 40~50 DEG C, more preferably -45~50 DEG C.Drying time is preferably 2~
3d, more preferably 2.5~3.5d.
Finally, the presoma is calcined, noble metal catalyst is obtained.
The time of calcining of the present invention is preferably 1~3 hour, and more preferably 1.5~2.5 hours, most preferably 1.8~
2.2 hour.The temperature of the calcining is not particularly limited in the present invention, and the temperature with calcining well known to those skilled in the art is
Can, those skilled in the art can select and adjust, this hair according to practical condition, raw material condition and product requirement
The temperature of the bright calcining is preferably 700~1000 DEG C, more preferably 750~950 DEG C, most preferably 800~900 DEG C.
The present invention also provides a kind of noble metal catalyst of active carbon confinement that above-mentioned preparation method is prepared, general formulas
Are as follows: (NMx)-C；
Wherein, N is noble metal, and M is base metal, and C is carbon carrier；X=(0~1)；
The precious metal element and non-noble metal j element are bonded on the carbon carrier.
The atomic ratio of the noble metal N and base metal M is 1:(0~1)；
The NMxIt is bonded on the carbon carrier；
The present invention limits the general formula without other, with the expression side of such product well known to those skilled in the art
Formula, those skilled in the art are on the basis of rudimentary knowledge, it is to be understood that formal sense representated by the general formula.
The present invention is to the NMxIn, the value range of x is not particularly limited, with value well known to those skilled in the art
Range, those skilled in the art can select and adjust according to practical condition, raw material condition and product requirement
Whole, the value range of x of the present invention is preferably 0~1, and more preferably 0.1~1, more preferably 0.3~0.5, most preferably
0.3~0.4.
The mass ratio of the sum of the carbon carrier and the precious metal salt and base metal salt is preferably (1000~4000):
100, more preferably (1500~3000): 100, most preferably (2000~2500): 100.
The present invention also provides the noble metal catalyst of active carbon confinement prepared by above-mentioned technical proposal any one or
Noble metal described in above-mentioned technical proposal any one and its intermetallic catalyst answering in new energy battery catalyst field
With.
New energy battery of the present invention preferably includes hydrogen-oxygen, hydrogen-air fuel cell or metal-air battery.
Hydrogen reduction (ORR) noble metal and its catalyst of high catalytic activity high stability provided by the invention, in acid item
There is splendid activity and stability under part, be suitable for a variety of new energy batteries or the air such as fuel cell, metal-air battery
Cell catalyst system has biggish discharge current and continuous work 100h or more does not decay under strongly acidic conditions.
The noble metal and its intermetallic fuel cell oxygen for the active carbon confinement that above-mentioned steps of the present invention are provided and prepared are also
Raw catalyst is made using complexing amphiphilic possessed by organic micromolecule ligand and to noble metal and alloy ion
Cluster containing metal salt and ligand is easy to be adsorbed by conductive black.The metal salt cluster adsorbed by conductive black hole
Confinement space is formed, little particle is formed in calcination process and can not further reunite, so as to which your gold of 2~5nm synthesized
Nano particle between category and its metal.Different from previous precious metal alloys catalyst, which utilizes absorbent charcoal carrier confinement item
The features such as part has pattern uniform, high stability.And confinement space can promote reactant concentration with local, thus in acidity
Under the conditions of the catalytic performance with splendid electrocatalytic oxidation reduction reaction, be suitable for a variety of new energy cell catalysts such as fuel cell
Agent system.Preparation flow is simple, low in cost, yield is suitable for greatly industrial production, and the electro-catalysis efficiency in terms of ORR can
Better than business Pt/C catalyst, for catalyst stability, the catalyst is with good stability.Suitable for combustion
Expect a variety of new energy battery air cell catalyst systems such as battery, metal-air battery.
The experimental results showed that using oxygen reduction reaction catalyst prepared by the present invention, half wave potential is super under strongly acidic conditions
Business Pt/C catalyst 40mV is crossed, mass activity can reach 8 times of business Pt/C catalyst, and continuous work 100h or more
Do not decay, electric current does not have significant change.
All raw materials of the present invention, are not particularly limited its source, buying on the market or according to those skilled in the art
The preparation of conventional method known to member.
For a further understanding of the present invention, urged below with reference to noble metal of the embodiment to active carbon confinement provided by the invention
Agent and preparation method thereof and application are illustrated, and protection scope of the present invention is not limited by the following examples.
Embodiment 1
Weigh the H of 7.5g2PtCl6·6H2The dicyanodiamine of O, 3.35g, are dispersed in the ethyl alcohol of 0.4L, stir at room temperature
After mixing 1h, then the KJ600 of 22g is weighed, above-mentioned dispersion solution is added, is stirred at room temperature for 24 hours；
Products therefrom is stirred 45 DEG C heating evaporation three days, allows ethanol evaporation contained by product；
Dried powder sample product is collected, by ball milling abundant in dry sample collection goal grinding jar at being put into quartz after powder
In porcelain boat, is calcined 2 hours for 800 DEG C in argon atmosphere, finally obtain Pt-KJ noble metal catalyst.
Using relevant characterizations such as X-ray diffraction, transmission electron microscope, electro-chemical tests, result as shown in Figure 1, 2, 3 is obtained.
Available product is Pt simple substance little particle from the X-ray diffraction pattern of Fig. 1, can calculate its crystalline substance according to Bragg equation
Particle size is in 2~3nm or so.We, which also count, from the transmission electron microscope schematic diagram of Fig. 2 obtains its average grain diameter and exists
2.43nm.The catalyst of 1.5mg is suspended in the 1:1 ethanol/water solution containing 5% Nafion of 0.6ml, 30 points of ultrasound
Clock prepares catalyst pulp.8 μ L catalyst pulps are added drop-wise on the polished glass carbon electrode of diameter 5mm, are baked under infrared lamp
It is dry.The final carrying capacity of catalyst is 0.2mg cm on glass-carbon electrode-2, measured by ICP-AES, Pt load capacity is 20ugPt cm-2.The electrode that catalyst coats is mounted on Pine ASR rotator, and as working electrode, electrolyte is O at room temperature2It is full
The 0.1MHClO of sum4Solution (pH=1).Electrochemical measurement carries out in the conventional three-electrode system in CHI760D electrochemistry station.
Ag/AgCl and graphite rod are used as reference electrode and to electrodes.Luggin capillary for reducing solution Ohmic resistance.Revolving speed is
1600rmin-1, with 10mV s-1Sweep speed record cathodic polarization curve, obtain result as shown in Figure 3.As a result it can see
Out, the catalyst being synthesized, half wave potential are greatly reduced and were reacted better than commercial carbon supported platinum catalyst 36mV at present
Current potential.
Embodiment 2
Weigh the H of 15.5g2PtCl6·6H2The CoCl of O, 2.3g2·6H2The tetrabutylammonium iodide of O, 29.5g, are dispersed in
In the ethyl alcohol of 0.4L, after 1h is stirred at room temperature, then the KJ600 of 44.5g is weighed, above-mentioned dispersion solution is added, is stirred at room temperature
24h；
Products therefrom is placed in 45 DEG C heat drying three days in heating stirrer, evaporates alcohol solvent sufficiently；
Dried powder sample product is collected, by ball milling abundant in the sample collection goal grinding jar being evaporated at being put into quartz after powder
In porcelain boat, is calcined 2 hours for 800 DEG C in argon atmosphere, finally obtain Pt3Co-KJ noble metal catalyst.
Using characterization similarly to Example 1, the result of Fig. 4,5,6 is obtained.From the X-ray diffraction pattern of Fig. 4 we
It can be seen that synthesized obtained Pt3The nano particle of Co, being fitted particle radius according to Bragg equation is about 2.4nm.Pass through
The high resolution electron microscope of Fig. 5 we it is also seen that the about Pt of 2nm or so that synthesis obtains3Co nano particle.From Fig. 6
Distribution diagram of element in we can see that Pt element and Co element are evenly dispersed in the sample.
Embodiment 3
Weigh the H of 7.5g2PtCl6·6H2The CoCl of O, 1.25g2·6H2The dicyanodiamine of O, 3.35g are dispersed in 0.4L's
In ethyl alcohol, after 1h is stirred at room temperature, then the KJ600 of 22g is weighed, above-mentioned dispersion solution is added, is stirred at room temperature for 24 hours；
By 45 DEG C heat drying three days in products therefrom heating stirrer, solid-state water sublimate contained by product is allowed to keep ethyl alcohol molten
Agent is sufficiently evaporated.Dried powder sample product is collected, by ball milling abundant in the sample collection goal grinding jar being evaporated at being put into after powder
In quartzy porcelain boat, is calcined 2 hours for 800 DEG C in argon atmosphere, finally obtain Pt3Co-KJ noble metal catalyst.
The catalyst of 1.5mg is suspended in the 1:1 ethanol/water solution containing 5% Nafion of 0.6ml, ultrasound 30
Minute, prepare catalyst pulp.8 μ L catalyst pulps are added drop-wise on the polished glass carbon electrode of diameter 5mm, are baked under infrared lamp
It is dry.The final carrying capacity of catalyst is 0.2mg cm on glass-carbon electrode-2, measured by ICP-AES, Pt load capacity is 20ugPt cm-2.The electrode that catalyst coats is mounted on Pine ASR rotator, and as working electrode, electrolyte is O at room temperature2It is full
The 0.1MHClO of sum4Solution (pH=1).Electrochemical measurement carries out in the conventional three-electrode system in CHI760D electrochemistry station.
Ag/AgCl and graphite rod are used as reference electrode and to electrodes.Luggin capillary for reducing solution Ohmic resistance.Revolving speed is
1600r min-1, with 10mV s-1Sweep speed record cathodic polarization curve, obtain result as shown in Figure 7.As a result it can see
Out, the catalyst being synthesized, half wave potential are greatly reduced and were reacted better than commercial carbon supported platinum catalyst 50mV at present
Current potential.Revolving speed is 1600r min-1, discharged with the constant potential of 0.8V vs RHE, record discharge curve, obtain such as Fig. 8 institute
Show result.As a result as can be seen that the catalyst being synthesized passes through its loss of activity 8% of the electric discharge of 500h, much smaller than business
The performance degradation 44% of catalyst, stability improve 5 times.
Embodiment 4
Weigh the RuCl of 7.5g3·6H2The dicyanodiamine of O, 29.5g, are dispersed in the ethyl alcohol of 0.4L, are stirred at room temperature
After 1h, then the KJ600 of 44.5g is weighed, above-mentioned dispersion solution is added, is stirred at room temperature for 24 hours；It will be in products therefrom heating stirrer
45 DEG C heat drying three days, allow solid-state water sublimate contained by product to evaporate alcohol solvent sufficiently.Dried powder sample product is collected, it will
Abundant ball milling calcines 2 for 900 DEG C in argon atmosphere at being put into quartzy porcelain boat after powder in the sample collection goal grinding jar being evaporated
Hour, finally obtain RuCo-KJ noble metal catalyst.Using characterization similarly to Example 1, Fig. 9 is obtained, result shown in 10.
Embodiment 5
Weigh the H of 15.5g2PtCl6·6H2The CoCl of O, 2.3g2·6H2The tetrabutylammonium iodide of O, 29.5g, are dispersed in
In the ethyl alcohol of 0.4L, after 1h is stirred at room temperature, then the XC-72R of 44.5g is weighed, above-mentioned dispersion solution is added, is stirred at room temperature
24h；
Products therefrom is placed in 45 DEG C heat drying three days in heating stirrer, evaporates alcohol solvent sufficiently；It collects dry
Dry powder-like product, by ball milling abundant in the sample collection goal grinding jar being evaporated at being put into after powder in quartzy porcelain boat, in argon gas
It is calcined 2 hours for 800 DEG C in atmosphere, finally obtains Pt3Co-XC72R noble metal catalyst.
We are characterized by X-ray diffraction and transmission electron microscope, obtain the characterization result such as Figure 11 and Figure 12.We
As can be seen that obtained sample is Pt3The nano particle of Co.It can be seen that its size about from transmission electron microscope
For 5nm or so.So it will be seen that KJ is relatively preferably in different activated carbon black selections.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of preparation method of the noble metal catalyst of active carbon confinement, which comprises the following steps:
A) precious metal salt, organic micromolecule ligand, activated carbon black and organic solvent dispersion are mixed, obtain black colloid；
B) the black colloid is thermally dried, obtains presoma；
C) presoma is calcined, obtains noble metal catalyst.
2. preparation method according to claim 1, which is characterized in that step A) carry out dispersion mixing when, further include non-expensive
Metal salt, the base metal salt include one of molysite, cobalt salt, nickel salt, mantoquita, manganese salt or a variety of, the base metal
The molar ratio of salt and the noble metal is (0~3): 1.
3. preparation method according to claim 1, which is characterized in that the precious metal salt be selected from platinum salt, palladium salt, ruthenium salt,
One of iridium salt, rhodium salt, gold salt and silver salt are a variety of；
The activated carbon black includes conductive black, carbonaceous mesophase spherules, acetylene black, active carbon, nanotube, carbon nanocoils, carbon fiber
One of dimension, electrically conductive graphite and Super P or a variety of；
The organic micromolecule ligand includes one of dicyanodiamine, tetrabutylammonium iodide and Phen or a variety of；
The organic solvent includes one of alcohols solvent, acetone, hexamethylene and pentane or a variety of.
4. preparation method according to claim 1, which is characterized in that the organic molecules-ligands and the precious metal salt
Molar ratio is (1~10): 1；
The mass ratio of the active carbon material and the precious metal salt is (2~100): 1；
The mass ratio of the organic solvent and the precious metal salt is (5~400): 1；
The mass ratio of the water and the organic solvent is (0~500): 1.
5. preparation method according to claim 1, which is characterized in that step A) are as follows:
Precious metal salt, organic micromolecule ligand are mixed and are scattered in organic solvent, dispersion liquid is obtained；
Activated carbon black is mixed with the dispersion liquid, absorption ageing is stirred, obtains black colloid.
6. preparation method according to claim 1, which is characterized in that the stirring and adsorbing ageing is logical oxygen stirring ageing,
The temperature of the stirring and adsorbing ageing is 15~35 DEG C, and the time is 8~40 hours.
7. preparation method according to claim 1, which is characterized in that the temperature of the heat drying is 30~60 DEG C, when
Between be 2~3 days.
8. preparation method according to claim 1, which is characterized in that the temperature of the calcining is 700~1000 DEG C；It is described
The time of calcining is 1~3 hour.
9. a kind of noble metal catalyst of the active carbon confinement of the preparation method preparation as described in claim 1~8 any one,
It is characterized in that, general formula are as follows: (NMx)-C；
Wherein, N is noble metal, and M is base metal, and C is carbon carrier；X=(0~1)；
The precious metal element and non-noble metal j element are bonded on the carbon carrier.
10. a kind of new energy battery, which is characterized in that including the preparation of preparation method described in claim 1~8 any one
The noble metal catalyst of active carbon confinement.
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| CN113584525A (en) * | 2021-08-03 | 2021-11-02 | 湖南新欧源环保科技有限公司 | Multi-ion blue-oxygen hydroxyl chip catalyst and preparation method thereof |
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