CN106099125A - A kind of palladium stannum cobalt ternary-alloy nanocatalyst and preparation method and application - Google Patents
A kind of palladium stannum cobalt ternary-alloy nanocatalyst and preparation method and application Download PDFInfo
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Abstract
The invention discloses a kind of palladium stannum cobalt ternary-alloy nanocatalyst and preparation method and application, the preparation method of the present invention is: be first dispersed in ethanol solution by nitrogen-doped graphene carrier ultrasound wave, pH value more than 11 is regulated after being subsequently adding solubility palladium salt, solubility pink salt and soluble cobalt, add sodium borohydride reduction and obtain the alcohol mixeding liquid of PdxSnyCoz nano ternary metal alloy, eventually pass centrifugal, wash, cool down, be dried to obtain palladium stannum cobalt ternary-alloy nanocatalyst.The present invention uses chemical reduction method to synthesize palladium stannum cobalt ternary-alloy nanocatalyst, by adding non-noble metal j element Sn, Co Yu Pd produces synergism, reduce the consumption of precious metals pd in nanocatalyst greatly, improve catalyst catalysis activity during oxygen reduction reaction, utilize N element doped graphene to increase the interaction of ternary alloy nano granule and carrier, improve the cyclical stability of catalyst.
Description
Technical field
The present invention relates to the preparing technical field of nanocatalyst, particularly relate to a kind of palladium stannum cobalt ternary-alloy nano-catalytic
Agent and preparation method and application.
Background technology
The negative pole of organic system lithium-air battery is lithium metal, is only used as storing the material of energy, and positive pole is then porous
Air electrode, by the electrolytes of conducting lithium ions between two electrodes.Air electrode is the main place of cell reaction, its physics
And chemical characteristic has important impact to battery performance etc., this is because in the charge and discharge process of battery, charge overpotential
Significantly greater than discharge overpotential, causes the energy efficiency of this battery system to be only 65%.Therefore, (oxygen is also how to improve electrode reaction
Former and oxygen evolution reaction) efficiency, reduces electrode overpotential, thus improves the energy efficiency of battery and cycle performance has become as
Key scientific problems urgently to be resolved hurrily in the development of organic system lithium-air battery and application process.
For the problem of activation polarization in lithium-air battery charge and discharge process, the most effective method is at air
Adding catalyst in positive pole, utilize catalyst adds the electric charge transfer rate and mass transfer rate accelerated in charge and discharge process.Mesh
The catalyst type of front research is the most, mainly has material with carbon element, noble metal, perovskite and metal oxide catalyst.At your gold
In genus, Pt demonstrates higher catalysis activity, but its mithridatism ability is poor, and price is high；Pd is as the gold of Pt system
Belonging to, price is only the half of Pt, and again owing to there being similar electronic structure between the two, Pd is due to the characteristic poison resistance ratio of self
Pt is strong, therefore replaces Pt and the most studied.But the existing catalyst containing noble metal, the too high levels of noble metal, urge
Change activity not good enough, and the cyclical stability of catalyst self is the most poor, thus cause the relatively costly of catalyst.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art, it is an object of the invention to provide a kind of palladium stannum cobalt ternary-alloy nano-catalytic
Agent and preparation method and application, thus solve the consumption mistake of the catalyst noble metal of redox reaction of the prior art
Height, the cyclical stability of catalysis activity and catalyst self is poor, thus causes relatively costly problem.
Technical scheme is as follows:
A kind of preparation method of palladium stannum cobalt ternary-alloy nanocatalyst, including step:
A, weigh nitrogen-doped graphene carrier and put in ethanol solution ultrasound wave dispersion 20-40min, obtain nitrogen-doped graphene
Ethanol solution；
B, according to predetermined mol ratio, solubility palladium salt, solubility pink salt, soluble cobalt are under agitation added N doping stone
Mix homogeneously in the ethanol solution of ink alkene, the pH value regulating solution afterwards reaches more than 11, obtains palladium, stannum, cobalt alcohol mixeding liquid；
C, in palladium, stannum, cobalt alcohol mixeding liquid add sodium borohydride stirring reaction 1-4h, make palladium ion, tin ion and cobalt ion
It is reduced to PdxSnyCoz nano ternary metal alloy completely, obtains the ethanol containing PdxSnyCoz nano ternary metal alloy and mix
Closing liquid, wherein x, y, z is molar fraction；
D, the alcohol mixeding liquid containing PdxSnyCoz nano ternary metal alloy is centrifuged separate, contained
The precipitation of PdxSnyCoz nano ternary metal alloy, and wash be precipitated to neutrality, postlyophilization, obtain palladium stannum cobalt ternary
Alloy nano catalyst.
The preparation method of described palladium stannum cobalt ternary-alloy nanocatalyst, wherein, in described step B, adds NaOH molten
The pH value of liquid regulation ethanol solution reaches more than 11.
The preparation method of described palladium stannum cobalt ternary-alloy nanocatalyst, wherein, in described step B, predetermined mole
Ratio is solubility palladium salt: solubility pink salt: soluble cobalt=(2-4): (2-6): (2-5).
The preparation method of described palladium stannum cobalt ternary-alloy nanocatalyst, wherein, in described step B, described solubility
Palladium salt is the one in Palladous nitrate., Palladous chloride., palladium.
The preparation method of described palladium stannum cobalt ternary-alloy nanocatalyst, wherein, in described step B, described solubility
Pink salt is the one in nitric acid stannous, stannous chloride, stannous acetate.
The preparation method of described palladium stannum cobalt ternary-alloy nanocatalyst, wherein, in described step B, described solubility
Cobalt salt is the one in cobalt nitrate, cobaltous chloride, cobaltous acetate.
The preparation method of described palladium stannum cobalt ternary-alloy nanocatalyst, wherein, in described step C, PdxSnyCoz receives
Molar fraction x=0.2-0.4 in rice ternary metal alloy, y=0.2-0.6, z=0.2-0.5.
The preparation method of described palladium stannum cobalt ternary-alloy nanocatalyst, wherein, in described step C, described palladium stannum cobalt
Ternary alloy nano catalyst includes ternary alloy nano granule and nitrogen-doped graphene, wherein, ternary alloy nano granule
Content is 10wt%-50wt%, and the content of nitrogen-doped graphene is 50wt%-90wt%.
A kind of palladium stannum cobalt ternary-alloy nanocatalyst, wherein, described palladium stannum cobalt ternary-alloy nanocatalyst uses such as
The preparation method of upper arbitrary described palladium stannum cobalt ternary-alloy nanocatalyst is prepared from.
The application of a kind of palladium stannum cobalt ternary-alloy nanocatalyst, wherein, by palladium stannum cobalt ternary-alloy nanometer described above
Catalyst is for being catalyzed the oxygen reduction reaction in lithium-air battery and fuel cell.
Beneficial effect: the present invention uses chemical reduction method to synthesize palladium stannum cobalt ternary-alloy nanocatalyst, non-by adding
Precious metal element Sn, Co produce synergism with Pd, reduce the consumption of precious metals pd in nanocatalyst greatly, improve and urge
Agent catalysis activity during oxygen reduction reaction, utilizes N element doped graphene to increase ternary alloy nano granule and load
The interaction of body, improves the cyclical stability of catalyst.
Accompanying drawing explanation
Fig. 1 is the SEM figure of palladium stannum cobalt ternary-alloy nanocatalyst of the present invention.
Fig. 2 is the XRD figure of palladium stannum cobalt ternary-alloy nanocatalyst of the present invention.
Fig. 3 is the Raman spectrogram of palladium stannum cobalt ternary-alloy nanocatalyst of the present invention.
Fig. 4 is the electro-chemical test curve of palladium stannum cobalt ternary-alloy nanocatalyst of the present invention.
Detailed description of the invention
The present invention provides a kind of palladium stannum cobalt ternary-alloy nanocatalyst and preparation method and application, for making the present invention's
Purpose, technical scheme and effect are clearer, clear and definite, and the present invention is described in more detail below.Should be appreciated that this place is retouched
The specific embodiment stated only in order to explain the present invention, is not intended to limit the present invention.
The present invention provides the preparation method of a kind of palladium stannum cobalt ternary-alloy nanocatalyst, and it includes step:
S100, weigh nitrogen-doped graphene carrier and put in ethanol solution (analytical pure, content is more than 99.9%) ultrasound wave dispersion
20-40min, obtains the ethanol solution of nitrogen-doped graphene；Wherein, weighing nitrogen-doped graphene carrier is 20-60mg；Ethanol is molten
Liquid does not participate in chemical reaction for dispersion solvent, during concrete operations, can take 20-100ml ethanol solution to carry out ultrasonic disperse nitrogen
Doped graphene carrier；
S200, according to predetermined mol ratio, solubility palladium salt, solubility pink salt, soluble cobalt are under agitation added N doping
Mix homogeneously (being i.e. sufficiently mixed) in the ethanol solution of Graphene, regulates the pH value of solution afterwards and reaches more than 11 (i.e. pH is 11-
14) palladium, stannum, cobalt alcohol mixeding liquid, are obtained；
S300, in palladium, stannum, cobalt alcohol mixeding liquid add sodium borohydride stirring reaction 1-4h, make palladium ion, tin ion and cobalt from
Son is reduced to PdxSnyCoz nano ternary metal alloy completely, obtains the ethanol containing PdxSnyCoz nano ternary metal alloy
Mixed liquor, wherein x, y, z is molar fraction；Add the amount of sodium borohydride for making palladium ion, tin ion and cobalt ion reduce completely
For the amount of PdxSnyCoz nano ternary metal alloy, that is to say and make palladium ion, tin ion and cobalt ion be reduced to metal completely
Amount (quantivalence from-divalent be reduced to 0 valency), specifically can count according to the amount of being actually added into of palladium ion, tin ion and cobalt ion
Calculating, computational methods are common knowledge, and here is omitted；
S400, the alcohol mixeding liquid containing PdxSnyCoz nano ternary metal alloy is centrifuged separate, contained
The precipitation of PdxSnyCoz nano ternary metal alloy, and wash be precipitated to neutrality, postlyophilization, obtain palladium stannum cobalt ternary
Alloy nano catalyst.
Palladium stannum cobalt ternary-alloy nanocatalyst of the present invention that is to say PdxSnyCoz nano ternary metal alloy nanometer
Catalyst, it is to be carrier by nitrogen-doped graphene (rGO-N), and loaded Nanoalloy includes palladium (Pd), stannum (Sn) and cobalt
(Co), synthesizing PdxSnyCoz nano ternary metal alloy by chemical reduction method, preparation method technique is simple, reduces greatly
The consumption of noble metal, to lithium-air battery, the low-temperature fuel cell such as methanol, ethanol has the catalysis of efficient oxygen reduction reaction and lives
Property.
Preferably, in described step S200, the pH value adding NaOH solution regulation ethanol solution reaches more than 11；Wherein
NaOH solution (sodium hydroxide solution) can be prepared with deionized water (or distilled water) by analytically pure sodium hydroxide, concrete concentration
Preparation can be selected the most flexibly.
Preferably, in described step S200, predetermined mol ratio (ratio of the amount of material) is solubility palladium salt: solubility stannum
Salt: soluble cobalt=(2-4): (2-6): (2-5).
Preferably, in described step S200, described solubility palladium salt is Pd (NO3)2(Palladous nitrate .), PdCl2(Palladous chloride .),
(CH3COO)2Pd(palladium) in one.
Preferably, in described step S200, described solubility pink salt is Sn (NO3)2(nitric acid stannous), SnCl2(protochloride
Stannum), (CH3COO)2Sn(stannous acetate) in one.
Preferably, in described step S200, described soluble cobalt is Co (NO3)2(cobalt nitrate), CoCl2(cobaltous chloride),
(CH3COO)2Co(cobaltous acetate) in one.
Preferably, in described step S300, molar fraction x=0.2-0.4 in PdxSnyCoz nano ternary metal alloy,
Y=0.2-0.6, z=0.2-0.5；Wherein, x=n(Pd)/[n(Pd)+n(Sn)+n(Co)], y=n(Sn)/[n(Pd)+n(Sn)+n
(Co)], z=n(Co)/[n(Pd)+n(Sn)+n(Co)], n(Pd), n(Sn), n(Co) be respectively the material of Pd, Sn, Co
Amount, unit is mmol(mM).
Sn is added by the present invention as additive, and the activity for Pd is obviously improved, and the adopting of the invention
With stannum, cobalt element is combined with palladium, produces coordinative role, and stannum is combined with palladium and there is the most collaborative facilitation, and the interpolation of cobalt
It is then to make the active area of Pd increase by being partly dissolved in catalytic process and increase activity.
Preferably, in described step S300, described palladium stannum cobalt ternary-alloy nanocatalyst includes ternary alloy nano
Grain and nitrogen-doped graphene, wherein, the content of ternary alloy nano granule is 10wt%-50wt%, containing of nitrogen-doped graphene
Amount is weight percentage for 50wt%-90wt%, wt%；Wherein, the particle size of ternary alloy nano granule is 8 ± 2.0nm.
Based on said method, the present invention also provides for a kind of palladium stannum cobalt ternary-alloy nanocatalyst, described palladium stannum cobalt ternary
Alloy nano catalyst uses the preparation method of arbitrary described palladium stannum cobalt ternary-alloy nanocatalyst to be prepared from.This
Invent by adding non-noble metal j element Sn, Co Yu Pd produces synergism, reduces the use of precious metals pd in nanocatalyst
Amount, improves catalyst catalysis activity during oxygen reduction reaction, utilizes N element doped graphene to increase ternary alloy three-partalloy and receive
Rice grain and the interaction of carrier, improve the cyclical stability of catalyst.
Based on said method, the present invention also provides for the application of a kind of palladium stannum cobalt ternary-alloy nanocatalyst, by as above institute
State palladium stannum cobalt ternary-alloy nanocatalyst for oxygen reduction reaction (the oxygen generation being catalyzed in lithium-air battery and fuel cell
Reduction reaction), greatly improve the oxygen reduction reaction to low-temperature fuel cells such as lithium-air battery, methanol and ethanol catalysis
Activity.
With specific embodiment, the present invention is elaborated below:
Embodiment 1:
1), weigh 50mg nitrogen-doped graphene carrier and put in ethanol solution ultrasound wave dispersion 30min, obtain nitrogen-doped graphene
Ethanol solution；
2), by 0.02mmolPdCl2、0.04mmol SnCl2、0.04mmolCoCl2Under agitation add nitrogen-doped graphene
Ethanol solution is sufficiently mixed, adds NaOH solution afterwards and regulate its pH value and reach more than 11, obtain palladium, stannum, cobalt alcohol mixeding liquid；
With molar ratio computing, PdCl2: SnCl2: CoCl2=2:4:4；
3), in palladium, stannum, cobalt alcohol mixeding liquid, add sodium borohydride stirring reaction 1h, make palladium ion, tin ion and cobalt ion complete
Entirely it is reduced to PdxSnyCoz nano ternary metal alloy, obtains the ethanol mixing containing PdxSnyCoz nano ternary metal alloy
Liquid, wherein x, y, z is molar fraction, x=0.2, y=0.4, z=0.4；
4), by the alcohol mixeding liquid containing PdxSnyCoz nano ternary metal alloy it is centrifuged separating, is contained
The precipitation of PdxSnyCoz nano ternary metal alloy, and wash be precipitated to neutrality, postlyophilization, obtain black powder
Palladium stannum cobalt ternary-alloy nanocatalyst (palladium stannum cobalt/nitrogen-doped graphene nanometer alloy catalyst).
Palladium stannum cobalt ternary-alloy nanocatalyst is characterized.Wherein, Fig. 1 is palladium stannum cobalt ternary-alloy nanocatalyst
SEM figure；Fig. 2 is the XRD figure of palladium stannum cobalt ternary-alloy nanocatalyst；Fig. 3 is palladium stannum cobalt ternary-alloy nanocatalyst
Raman spectrogram；Fig. 4 is the electro-chemical test curve of palladium stannum cobalt ternary-alloy nanocatalyst.Interpretation of result finds: the present invention
Obtained by palladium stannum cobalt ternary-alloy nanocatalyst uniform load on the surface of nitrogen-doped graphene, grain diameter is 8 ±
2nm, the characteristic diffraction peak in its XRD figure is similar to Metal Palladium, increases with nitrogen-doped graphene effect rear stability, and this ternary is closed
The oxygen reduction reaction catalytic performance of gold is better than business Pd/C alloy and other palladio bianry alloy.
Embodiment 2:
1), weigh 20mg nitrogen-doped graphene carrier and put in ethanol solution ultrasound wave dispersion 20min, obtain nitrogen-doped graphene
Ethanol solution；
2), by 0.02mmol Pd (NO3)2、0.03mmol Sn(NO3)2、 0.05mmolCo(NO3)2Under agitation add nitrogen to mix
The ethanol solution of miscellaneous Graphene is sufficiently mixed, adds NaOH solution afterwards and regulate its pH value and reach more than 11, obtain palladium, stannum, cobalt
Alcohol mixeding liquid；With molar ratio computing, Pd (NO3)2: Sn (NO3)2: Co (NO3)2=2:3:5；
3), in palladium, stannum, cobalt alcohol mixeding liquid, add sodium borohydride stirring reaction 2h, make palladium ion, tin ion and cobalt ion complete
Entirely it is reduced to PdxSnyCoz nano ternary metal alloy, obtains the ethanol mixing containing PdxSnyCoz nano ternary metal alloy
Liquid, wherein x, y, z is molar fraction, x=0.2, y=0.3, z=0.5；
4), by the alcohol mixeding liquid containing PdxSnyCoz nano ternary metal alloy it is centrifuged separating, is contained
The precipitation of PdxSnyCoz nano ternary metal alloy, and wash be precipitated to neutrality, postlyophilization, obtain black powder
Palladium stannum cobalt ternary-alloy nanocatalyst.
Prepared by the present embodiment palladium stannum cobalt ternary-alloy nanocatalyst SEM figure, XRD figure, Raman spectrogram and electricity
Test chemical curve illustrates the most one by one at this.Finding through analyzing, similar with implementing 1, the palladium stannum cobalt ternary obtained by this enforcement is closed
Gold nano catalyst has same feature performance benefit.
Embodiment 3:
1), weigh 40mg nitrogen-doped graphene carrier and put in ethanol solution ultrasound wave dispersion 30min, obtain nitrogen-doped graphene
Ethanol solution；
2), by 0.04mmol (CH3COO)2Pd、0.04mmol (CH3COO)2Sn、0.02mmol(CH3COO)2Co is under agitation
Add in the ethanol solution of nitrogen-doped graphene and be sufficiently mixed, add NaOH solution afterwards and regulate its pH value and reach more than 11, obtain
Palladium, stannum, cobalt alcohol mixeding liquid；With molar ratio computing, (CH3COO)2Pd:(CH3COO)2Sn:(CH3COO)2Co=4:4:2；
3), in palladium, stannum, cobalt alcohol mixeding liquid, add sodium borohydride stirring reaction 1.5h, make palladium ion, tin ion and cobalt ion
It is reduced to PdxSnyCoz nano ternary metal alloy completely, obtains the ethanol containing PdxSnyCoz nano ternary metal alloy and mix
Closing liquid, wherein x, y, z is molar fraction, x=0.4, y=0.4, z=0.2；
4), by the alcohol mixeding liquid containing PdxSnyCoz nano ternary metal alloy it is centrifuged separating, is contained
The precipitation of PdxSnyCoz nano ternary metal alloy, and wash be precipitated to neutrality, postlyophilization, obtain black powder
Palladium stannum cobalt ternary-alloy nanocatalyst.
Prepared by the present embodiment palladium stannum cobalt ternary-alloy nanocatalyst SEM figure, XRD figure, Raman spectrogram and electricity
Test chemical curve illustrates the most one by one at this.Finding through analyzing, similar with implementing 1, the palladium stannum cobalt ternary obtained by this enforcement is closed
Gold nano catalyst has same feature performance benefit.
Embodiment 4:
1), weigh 30mg nitrogen-doped graphene carrier and put in ethanol solution ultrasound wave dispersion 30min, obtain nitrogen-doped graphene
Ethanol solution；
2), by 0.03mmol Pd (NO3)2、0.06mmol Sn(NO3)2、0.05mmolCo(NO3)2Under agitation add N doping
The ethanol solution of Graphene is sufficiently mixed, adds NaOH solution afterwards and regulate its pH value and reach more than 11, obtain palladium, stannum, cobalt second
Alcohol mixed liquor；With molar ratio computing, (CH3COO)2Pd:(CH3COO)2Sn:(CH3COO)2Co=3:6:5；
3), in palladium, stannum, cobalt alcohol mixeding liquid, add sodium borohydride stirring reaction 3h, make palladium ion, tin ion and cobalt ion complete
Entirely it is reduced to PdxSnyCoz nano ternary metal alloy, obtains the ethanol mixing containing PdxSnyCoz nano ternary metal alloy
Liquid, wherein x, y, z is molar fraction, x=0.21, y=0.43, z=0.36；
4), by the alcohol mixeding liquid containing PdxSnyCoz nano ternary metal alloy it is centrifuged separating, is contained
The precipitation of PdxSnyCoz nano ternary metal alloy, and wash be precipitated to neutrality, postlyophilization, obtain black powder
Palladium stannum cobalt ternary-alloy nanocatalyst.
Prepared by the present embodiment palladium stannum cobalt ternary-alloy nanocatalyst SEM figure, XRD figure, Raman spectrogram and electricity
Test chemical curve illustrates the most one by one at this.Finding through analyzing, similar with implementing 1, the palladium stannum cobalt ternary obtained by this enforcement is closed
Gold nano catalyst has same feature performance benefit.
Embodiment 5:
1), weigh 60mg nitrogen-doped graphene carrier and put in ethanol solution ultrasound wave dispersion 40min, obtain nitrogen-doped graphene
Ethanol solution；
2), by 0.02mmol (CH3COO)2Pd、 0.06mmol Sn(NO3)2、 0.02mmol CoCl2Under agitation add nitrogen
The ethanol solution of doped graphene is sufficiently mixed, adds NaOH solution afterwards and regulate its pH value and reach more than 11, obtain palladium, stannum,
Cobalt alcohol mixeding liquid；With molar ratio computing, (CH3COO)2Pd:Sn (NO3)2: CoCl2=2:6:2；
3), in palladium, stannum, cobalt alcohol mixeding liquid, add sodium borohydride stirring reaction 3h, make palladium ion, tin ion and cobalt ion complete
Entirely it is reduced to PdxSnyCoz nano ternary metal alloy, obtains the ethanol mixing containing PdxSnyCoz nano ternary metal alloy
Liquid, wherein x, y, z is molar fraction, x=0.2, y=0.6, z=0.2；
4), by the alcohol mixeding liquid containing PdxSnyCoz nano ternary metal alloy it is centrifuged separating, is contained
The precipitation of PdxSnyCoz nano ternary metal alloy, and wash be precipitated to neutrality, postlyophilization, obtain black powder
Palladium stannum cobalt ternary-alloy nanocatalyst.
Prepared by the present embodiment palladium stannum cobalt ternary-alloy nanocatalyst SEM figure, XRD figure, Raman spectrogram and electricity
Test chemical curve illustrates the most one by one at this.Finding through analyzing, similar with implementing 1, the palladium stannum cobalt ternary obtained by this enforcement is closed
Gold nano catalyst has same feature performance benefit.
Embodiment 6:
1), weigh 30mg nitrogen-doped graphene carrier and put in ethanol solution ultrasound wave dispersion 30min, obtain nitrogen-doped graphene
Ethanol solution；
2), by 0.04mmol PdCl2、 0.06mmol Sn(NO3)2、 0.03mmol CoCl2Under agitation add N doping stone
The ethanol solution of ink alkene is sufficiently mixed, adds NaOH solution afterwards and regulate its pH value and reach more than 11, obtain palladium, stannum, cobalt ethanol
Mixed liquor；With molar ratio computing, PdCl2: Sn (NO3)2: CoCl2=4:6:3；
3), in palladium, stannum, cobalt alcohol mixeding liquid, add sodium borohydride stirring reaction 4h, make palladium ion, tin ion and cobalt ion complete
Entirely it is reduced to PdxSnyCoz nano ternary metal alloy, obtains the ethanol mixing containing PdxSnyCoz nano ternary metal alloy
Liquid, wherein x, y, z is molar fraction, x=0.31, y=0.46, z=0.23；
4), by the alcohol mixeding liquid containing PdxSnyCoz nano ternary metal alloy it is centrifuged separating, is contained
The precipitation of PdxSnyCoz nano ternary metal alloy, and wash be precipitated to neutrality, postlyophilization, obtain black powder
Palladium stannum cobalt ternary-alloy nanocatalyst.
Prepared by the present embodiment palladium stannum cobalt ternary-alloy nanocatalyst SEM figure, XRD figure, Raman spectrogram and electricity
Test chemical curve illustrates the most one by one at this.Finding through analyzing, similar with implementing 1, the palladium stannum cobalt ternary obtained by this enforcement is closed
Gold nano catalyst has same feature performance benefit.
Embodiment 7:
1), weigh 30mg nitrogen-doped graphene carrier and put in ethanol solution ultrasound wave dispersion 30min, obtain nitrogen-doped graphene
Ethanol solution；
2), by 0.04mmol PdCl2、0.02mmol Sn(NO3)2、0.04mmol CoCl2Under agitation add N doping graphite
The ethanol solution of alkene is sufficiently mixed, adds NaOH solution afterwards and regulate its pH value and reach more than 11, obtain palladium, stannum, cobalt ethanol mix
Close liquid；With molar ratio computing, PdCl2: Sn (NO3)2: CoCl2=4:2:4；
3), in palladium, stannum, cobalt alcohol mixeding liquid, add sodium borohydride stirring reaction 4h, make palladium ion, tin ion and cobalt ion complete
Entirely it is reduced to PdxSnyCoz nano ternary metal alloy, obtains the ethanol mixing containing PdxSnyCoz nano ternary metal alloy
Liquid, wherein x, y, z is molar fraction, x=0.4, y=0.2, z=0.4；
4), by the alcohol mixeding liquid containing PdxSnyCoz nano ternary metal alloy it is centrifuged separating, is contained
The precipitation of PdxSnyCoz nano ternary metal alloy, and wash be precipitated to neutrality, postlyophilization, obtain black powder
Palladium stannum cobalt ternary-alloy nanocatalyst.
Prepared by the present embodiment palladium stannum cobalt ternary-alloy nanocatalyst SEM figure, XRD figure, Raman spectrogram and electricity
Test chemical curve illustrates the most one by one at this.Finding through analyzing, similar with implementing 1, the palladium stannum cobalt ternary obtained by this enforcement is closed
Gold nano catalyst has same feature performance benefit.
In sum, the present invention uses chemical reduction method to synthesize palladium stannum cobalt ternary-alloy nanocatalyst, non-by adding
Precious metal element Sn, Co produce synergism with Pd, reduce the consumption of precious metals pd in nanocatalyst greatly, improve and urge
Agent catalysis activity during oxygen reduction reaction, utilizes N element doped graphene to increase ternary alloy nano granule and load
The interaction of body, improves the cyclical stability of catalyst.
It should be appreciated that the application of the present invention is not limited to above-mentioned citing, for those of ordinary skills, can
To be improved according to the above description or to convert, all these modifications and variations all should belong to the guarantor of claims of the present invention
Protect scope.
Claims (10)
1. the preparation method of a palladium stannum cobalt ternary-alloy nanocatalyst, it is characterised in that include step:
A, weigh nitrogen-doped graphene carrier and put in ethanol solution ultrasound wave dispersion 20-40min, obtain nitrogen-doped graphene
Ethanol solution；
B, according to predetermined mol ratio, solubility palladium salt, solubility pink salt, soluble cobalt are under agitation added N doping stone
Mix homogeneously in the ethanol solution of ink alkene, the pH value regulating solution afterwards reaches more than 11, obtains palladium, stannum, cobalt alcohol mixeding liquid；
C, in palladium, stannum, cobalt alcohol mixeding liquid add sodium borohydride stirring reaction 1-4h, make palladium ion, tin ion and cobalt ion
It is reduced to PdxSnyCoz nano ternary metal alloy completely, obtains the ethanol containing PdxSnyCoz nano ternary metal alloy and mix
Closing liquid, wherein x, y, z is molar fraction；
D, the alcohol mixeding liquid containing PdxSnyCoz nano ternary metal alloy is centrifuged separate, contained
The precipitation of PdxSnyCoz nano ternary metal alloy, and wash be precipitated to neutrality, postlyophilization, obtain palladium stannum cobalt ternary
Alloy nano catalyst.
The preparation method of palladium stannum cobalt ternary-alloy nanocatalyst the most according to claim 1, it is characterised in that described step
In rapid B, the pH value adding NaOH solution regulation ethanol solution reaches more than 11.
The preparation method of palladium stannum cobalt ternary-alloy nanocatalyst the most according to claim 1, it is characterised in that described step
In rapid B, predetermined mol ratio is solubility palladium salt: solubility pink salt: soluble cobalt=(2-4): (2-6): (2-5).
The preparation method of palladium stannum cobalt ternary-alloy nanocatalyst the most according to claim 1, it is characterised in that described step
In rapid B, described solubility palladium salt is the one in Palladous nitrate., Palladous chloride., palladium.
The preparation method of palladium stannum cobalt ternary-alloy nanocatalyst the most according to claim 1, it is characterised in that described step
In rapid B, described solubility pink salt is the one in nitric acid stannous, stannous chloride, stannous acetate.
The preparation method of palladium stannum cobalt ternary-alloy nanocatalyst the most according to claim 1, it is characterised in that described step
In rapid B, described soluble cobalt is the one in cobalt nitrate, cobaltous chloride, cobaltous acetate.
The preparation method of palladium stannum cobalt ternary-alloy nanocatalyst the most according to claim 1, it is characterised in that described step
In rapid C, molar fraction x=0.2-0.4 in PdxSnyCoz nano ternary metal alloy, y=0.2-0.6, z=0.2-0.5.
The preparation method of palladium stannum cobalt ternary-alloy nanocatalyst the most according to claim 1, it is characterised in that described step
In rapid C, described palladium stannum cobalt ternary-alloy nanocatalyst includes ternary alloy nano granule and nitrogen-doped graphene, wherein, three
The content of unit's alloy nanoparticle is 10wt%-50wt%, and the content of nitrogen-doped graphene is 50wt%-90wt%.
9. a palladium stannum cobalt ternary-alloy nanocatalyst, it is characterised in that described palladium stannum cobalt ternary-alloy nanocatalyst is adopted
It is prepared from by the preparation method of the palladium stannum cobalt ternary-alloy nanocatalyst as described in claim 1-8 is arbitrary.
10. the application of a palladium stannum cobalt ternary-alloy nanocatalyst, it is characterised in that by palladium stannum cobalt as claimed in claim 9
Ternary alloy nano catalyst is for being catalyzed the oxygen reduction reaction in lithium-air battery and fuel cell.
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| CN109280800A (en) * | 2018-09-20 | 2019-01-29 | 南京邮电大学 | A kind of Series P dxSnyAlloy nanometer crystals and preparation method and application |
| CN109768293A (en) * | 2019-03-10 | 2019-05-17 | 上海大学 | Nanoscale tin nitrogen carbon material, preparation method and the application as oxygen reduction elctro-catalyst under alkaline condition |
| CN111346645A (en) * | 2020-03-13 | 2020-06-30 | 苏州大学 | Preparation method and application of high-dispersion alloy nanoparticles |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107123817A (en) * | 2017-04-11 | 2017-09-01 | 浙江工业大学 | A kind of three metal alloy support type graphene nano Porous materials and its preparation method and application |
| CN109280800A (en) * | 2018-09-20 | 2019-01-29 | 南京邮电大学 | A kind of Series P dxSnyAlloy nanometer crystals and preparation method and application |
| CN109280800B (en) * | 2018-09-20 | 2021-07-13 | 南京邮电大学 | Series PdxSny alloy nanocrystals and preparation method and application thereof |
| CN109768293A (en) * | 2019-03-10 | 2019-05-17 | 上海大学 | Nanoscale tin nitrogen carbon material, preparation method and the application as oxygen reduction elctro-catalyst under alkaline condition |
| CN111346645A (en) * | 2020-03-13 | 2020-06-30 | 苏州大学 | Preparation method and application of high-dispersion alloy nanoparticles |
| CN111346645B (en) * | 2020-03-13 | 2023-11-28 | 苏州大学 | Preparation method and application of high-dispersion alloy nano particles |
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Application publication date: 20161109 |