CN109971172A - A kind of one one step preparation method of palladium-silver/polyaniline nano-composite material and application - Google Patents
A kind of one one step preparation method of palladium-silver/polyaniline nano-composite material and application Download PDFInfo
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Abstract
The invention discloses an a kind of one step preparation method of palladium-silver/polyaniline nano-composite material and applications.The present invention is the following steps are included: being added to Metal Palladium salt precursor body, metallic silver salt precursor body powder and surfactant powder in the alcohol containing nitric acid-water mixed solution system；Reaction solution is radiated using ultrasonic irradiation apparatus, aniline is added dropwise into solution, the ultrasonic radiation under atmosphere of inert gases；After purification process be dried in vacuo to get.The present invention does not add strong reductant and oxidant, one-step synthesis palladium-silver/polyaniline nano-composite material, reducing agent and oxidant are not only saved, also improve combined coefficient, method is simple and easy, it is with short production cycle, the glass-carbon electrode of composite material modification presents preferable catalytic activity to ethyl alcohol under alkaline condition, suitable for the small organic molecules substance such as electro-catalysis ethyl alcohol, formic acid, the catalyst that can be used as Direct Ethanol Fuel Cell or direct methanoic acid fuel cell has good application prospect.
Description
Technical field
The invention belongs to nanocomposite technical fields.It is multiple more particularly, to a kind of palladium-silver/polyaniline nano
One one step preparation method of condensation material and application.
Background technique
Noble metal/Conducting Polymer Nanocomposites not only remain the high conductivity of conducting polymer, while having again
The standby exclusive excellent physical and chemical performance of noble metal nano particles.Nanoparticle is easy to reunite, and conducting polymer is as noble metal
The dispersible carrier of nanoparticle enhances the stability between noble metal nano particles and substrate, improves point of nano particle
Property is dissipated, the sensing capabilities of noble metal nano particles, especially catalytic performance are further increased.
Precious metal palladium (Pd) is as a kind of important catalyst for fuel cell material, always by the favor of researcher,
It can compare favourably with Pt, and its price is only the 1/3 of the latter, this advantageously reduces the cost of catalyst；Meanwhile monometallic Pd's
On Research foundation, another metal is introduced into system, forms Nanoalloy, not only reduces the dosage of Pd, and introduce
Second of metal be conducive to by force adsorb residue oxidation, show certain synergistic effect, urging for Nanoalloy can be improved
Change activity, anti-toxicity, selectivity and stability.It is in recent years very active for the scientific research of the catalyst of bimetallic containing Pd,
Under identical reducing condition, silver-colored (Ag) has proven to be the ideal material [J.Phys.Chem.C that alloy is formed with Pd
2011,115(30):14844-14851].Pd/Ag alloy catalyst also illustrates the small organic molecules such as ethyl alcohol, methanol, formic acid
Good electrocatalysis characteristic [ACS.Catal., 2012,2 (1): 84-90；Adv.Mater.,2018,30(11):1706962-
1706967；Renew.Energy.,2018,126:1085-1092].Since nanoparticle is easy to reunite, polyaniline (PANI) is made
For a kind of conducting polymer, in addition to high conductivity, environmental stability, redox characteristic and being easy to get etc. many excellent
Outside performance, the N on molecule long-chain can stablize in nanocomposite metallic [ACS Nano., 2011,5 (5):
3469-3474], as the carrier of catalyst, not only improve the dispersibility of nanoparticle, and reduce catalyst at
This.
The catalytic performance of catalyst is influenced by composite factors such as its micro-structure, surface composition, morphology and size distributions, and
These factors depend primarily on the synthetic method of catalyst.Currently, synthesis noble metal/Conducting Polymer Nanocomposites system
Preparation Method focuses primarily upon the method for fractional steps or first prepares conducting polymer, then using gained conducting polymer as support dispersion
In the solution of metal precursor or it is fixed on the deposition of the surface of electrode for metal catalyst particles and obtains composite material；It wants
Noble metal nanometer material is synthesized first, then using it as template, utilizes chemistry or electrochemical method synthesis conducting polymer and expensive
Metal nanometer composite material, so that substep obtains composite material, to be that reaction process is many and diverse.Thus one-step synthesis is developed to lead
The method of electric macromolecule and noble metal nano composite material, i.e., in same system, while oxidative polymerization occurs for monomer
Metal precursor is reduced, and a step can obtain the compound of metallic particles and conducting polymer, although this method is easy, fast
Victory, but it is only applicable to a small number of conducting polymer and metal, it is difficult to promote, limits nano-noble metal/conduction to a certain extent
The practicalization of polymer composite.In addition, the growth of nanoparticle will follow energy most from the perspective of thermodynamics
Low principle and the smallest principle of surface area, the nanoparticle of Yao Hecheng controlled dimensions are generally required than convenient growing environment.
The synthesis of polyaniline is an exothermic reaction, and temperature is excessively high to be unfavorable for aniline polymerization, coats the structure of noble metal nano particles
It can be deteriorated, therefore, seek a kind of safety, cheap, reaction temperature is lower, noble metal with short production cycle/conducting polymer nanometer
The preparation method of composite material, to promote the application of catalyst for fuel cell that there is certain practical value.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the defect of the above-mentioned prior art and deficiencies, provide a kind of palladium-silver conjunction
One one step preparation method of gold/polyaniline nano-composite material.Present invention process is simple, and nontoxic solvent environmental protection, reaction temperature is lower,
With short production cycle, at low cost, product uniformity is good, one-step synthesis palladium-silver/polyaniline nano-composite material.
It is a further object of the present invention to provide a kind of palladium-silver/polyaniline nano-composite materials.
Another object of the present invention be to provide above-mentioned palladium-silver/polyaniline nano-composite material as or prepare fuel
Application in battery catalyst.
Above-mentioned purpose of the present invention is achieved through the following technical solutions:
A kind of preparation method of palladium-silver/polyaniline nano-composite material, comprising the following steps:
The surfactant powder of Metal Palladium salt precursor body, metallic silver salt precursor body powder and 0.4~0.6g is added
Into alcohol-water mixed solution system of the nitric acid of the 1M Han 2.00~2.50mL；After being passed through inert gas for a period of time, using super
Acoustic radiating devices radiate reaction solution, and aniline is added dropwise into solution, under atmosphere of inert gases ultrasonic radiation 80~
100min；By after centrifugation, washing, alcohol are washed, the palladium-silver/poly- is can be obtained in vacuum drying after product freezing demulsification
Aniline nano composite material.
It dissolves each other in innoxious solvent lower temperature synthesis noble metal nano alloy/conducting polymer nanometer in next step in alcohol/water
Composite material is a kind of simple and more environmentally friendly technology, has important Practical significance.Just at present, it is not restoring by force
Under conditions of agent and oxidant, develop simple one-step synthesis noble metal nano alloy/conductive polymer in solution at a lower temperature
Sub- nanocomposite is still a very big challenge.The present invention is in the mixed solution system of water-alcohol, with dodecyl sulphur
Sour sodium is that emulsifier, using nitrogen protection, while metal precursor is restored, aniline is gathered using Ultrasonic Radiation technology
Conjunction obtained polyaniline, one-step synthesis palladium-silver/polyaniline nano-composite material.
Further, in preferred embodiments of the present invention, the surfactant is lauryl sodium sulfate.
Further, in preferred embodiments of the present invention, the volume ratio of alcohol and water is 1 in the alcohol-water mixed solution:
1.5~4.
Further, in preferred embodiments of the present invention, the alcohol in the alcohol-water mixed solution is ethyl alcohol.
Further, in preferred embodiments of the present invention, the Metal Palladium salt precursor body is palladium nitrate；The metallic silver
Salt precursor body is silver nitrate.
Further, in preferred embodiments of the present invention, metal palladium salt precursor, metallic silver salt precursor body, aniline
Mass ratio is 7~28:2.2~48:5.6~248.4.
Further, in preferred embodiments of the present invention, metal palladium salt precursor, metallic silver salt precursor body, aniline
Mass ratio be 7~28:5~12:62.1~113.
Further, in preferred embodiments of the present invention, the time for being passed through inert gas is 15~20min.
Further, in preferred embodiments of the present invention, the inert gas is nitrogen.
Further, in preferred embodiments of the present invention, the power of ultrasonic radiation is 350~400W, and reaction temperature is
19~21 DEG C.Such as: the power of ultrasonic radiation can be 350W, 360W, 370W, 380W, 390W, 400W.Reaction temperature can be 19
℃、19.5℃、20℃、20.5℃、21℃。
Further, in preferred embodiments of the present invention, the ultrasonic irradiation apparatus is ultrasonic cell disruptor.
Further, in preferred embodiments of the present invention, cooling time is 6~48h, and cryogenic temperature is -18~-12
℃.Such as: cooling time can for 6h, 12h, 16h, for 24 hours, 36h, 48h, cryogenic temperature can be -18 DEG C, -17 DEG C, -16 DEG C, -15
℃、-14℃、-13℃、-12℃。
Further, in preferred embodiments of the present invention, vacuum drying temperature is 35~45 DEG C, and vacuum drying time is
8~48h.Such as: vacuum drying temperature can be 35 DEG C, 37 DEG C, 39 DEG C, 41 DEG C, 43 DEG C, 45 DEG C, vacuum drying time can for 8h,
12h、24h、32h、36h、48h。
The present invention is low in water-alcohol in the mixed solvent using Ultrasonic Radiation technology using lauryl sodium sulfate as emulsifier
Warm one-step synthesis palladium-silver Nanoalloy/polyaniline nano-composite material, reaction rate are easy to control, and reaction system is simple and ring
It protects, operation and post-processing simplicity, production cost is low, and reaction time is short, and product uniformity is good.
Palladium-silver/polyaniline nano-composite material that the above method is prepared, also protection scope of the present invention it
It is interior.
Palladium-silver/polyaniline nano-composite material that the above method is prepared as or prepare direct Aalcohols fuel
Application in battery or direct methanoic acid fuel cell catalyst, the especially application in electro-catalysis ethyl alcohol, also in the present invention
Protection scope within.
Compared with prior art, the invention has the following advantages:
1, the present invention does not add such as sodium borohydride, ascorbic acid at a lower temperature using Ultrasonic Radiation technology
Deng strong reductant and the oxidant of such as ammonium persulfate can be Pd only in alcohol/water mixed system2+And Ag+Equal metals
Ion coreduction, at the same time, aniline monomer polymerize to have obtained polyaniline, i.e. one-step synthesis palladium-silver/polyaniline nano is multiple
Condensation material, low in cost, preparation process is simple, and post-processing operation is easy.
2, for the present invention under atmospheric pressure environment and lower temperature conditions, a step prepares palladium-silver/polyaniline nano composite wood
Material, process conditions are mildly environmentally friendly, and efficiently quickly, product uniformity is good.
3, palladium-silver prepared by the present invention/polyaniline nano-composite material modified electrode, under alkaline condition to ethyl alcohol
There is good electro catalytic activity, suitable for small organic molecules substances such as electro-catalysis ethyl alcohol, formic acid, can be used as direct alcohols combustion
Expect battery or direct methanoic acid fuel cell catalyst, has a good application prospect.
Detailed description of the invention
Fig. 1 is palladium-silver/polyaniline nano-composite material field emission scanning electron microscope photo of the embodiment of the present invention 1.
Fig. 2 is palladium-silver/polyaniline nano-composite material transmission electron microscope photo of the embodiment of the present invention 1.
Fig. 3 is palladium-silver/polyaniline nano-composite material XRD diffraction pattern prepared by the embodiment of the present invention 1.
Fig. 4 is the figure of palladium-silver/polyaniline nano-composite material EDS prepared by the embodiment of the present invention 1.
Fig. 5 is palladium-silver/polyaniline nano-composite material infrared spectroscopy of the embodiment of the present invention 1.
A, b, c, d, e curve in Fig. 6 is respectively that palladium-silver/polyaniline nano of the embodiment of the present invention 1,2,3,4 and 5 is compound
Electro-catalysis cyclic voltammetry curve of the material to ethyl alcohol.(48 μ g/ of electrode surface palladium-silver/polyaniline nano-composite material load capacity
cm2, electrolyte is the 1mol/L KOH solution of the ethyl alcohol of 1mol/L, sweep speed 50mV/s, three-electrode system: with drop coating palladium
Silver/polyaniline nano-composite material modified glassy carbon electrode (Pd/GCE) is working electrode, and saturated calomel electrode (SCE) is reference electricity
Pole, platinum electrode are auxiliary electrode).
Specific embodiment
Further illustrate that the present invention (is closed using the electro catalytic activity evaluation palladium-silver of ethyl alcohol below in conjunction with specific embodiment
Gold/polyaniline nano-composite material catalytic performance), but embodiment does not limit in any form the present invention.It is not carrying on the back
In the case where from spirit of that invention and essence, to simple modifications or substitutions made by the method for the present invention, step or condition, belong to
The scope of the present invention；Unless otherwise specified, the routine that technological means used in embodiment is well known to those skilled in the art
Means.
Unless stated otherwise, following embodiment agents useful for same and material are commercially available.
Field emission scanning electron microscope (FESEM) photo is scanned aobvious by the 200 type field emission electron of Sirion of FEI Co., the U.S.
Micro mirror obtains.Transmission electron microscope photo (TEM) and EDS are transmitted electric by company, Jeol Ltd. JEOL-2010 type
Sub- microscope obtains, using Cu as matrix；X-ray diffraction (XRD) map of sample is by Beijing Pu Xi all purpose instrument Co., Ltd
XD-3 type X-ray diffraction analysis instrument measurement (Cu target, Ka radiation, λ=0.15406nm), operating voltage 36kV, tube current 30Ma；
FT-IR test is carried out using the Nicolet380 type Fourier infrared spectrograph of Thermo Electron company, U.S. production；It follows
Ring volt-ampere curve (CV) is obtained by Shanghai Chen Hua Instrument Ltd. electrochemical workstation CHI-660E.
A kind of preparation method of the palladium-silver/polyaniline nano-composite material of embodiment 1
1, a kind of preparation method of palladium-silver/polyaniline nano-composite material, comprising the following steps:
(1) 7mg Pd (NO is weighed3)2Powder, 12mg AgNO3Powder, 0.5g SDS are added in reactor；
(2) 40mL water, 10mL ethyl alcohol, 2.25mL nitric acid (1M) are measured to be mixed and be added in above-mentioned reactor, is led to
Enter nitrogen 15min；
(3) reactor is placed in ultrasonic cell disruptor, 62.1mg aniline is added to solution, ultrasonic power is
400W, reaction temperature are 20 DEG C, and 90min is reacted in ultrasonic radiation in nitrogen atmosphere.
(4) product is put into -17~-14 DEG C of refrigerator freezing 12h, successively the repeatedly centrifugation point such as washes through washing, alcohol after demulsification
From rear, dry in 40 DEG C of vacuum ovens for 24 hours to get palladium-silver/polyaniline nano-composite material.
2, product characterizes
(1) palladium-silver/polyaniline nano-composite material microscopic appearance is in near-spherical as shown in Figure 1, form is uniform,
Average grain diameter is 130nm.In conjunction with its transmission electron microscope photo (see Fig. 2), the palladium-silver/polyphenyl being prepared according to embodiment 1
Metal nanoparticle is self-assembled into cluster-shaped in amine nanocomposite, and average grain diameter 10nm is embedded in polyaniline matrix.
(2) Fig. 3 is palladium-silver/polyaniline nano-composite material XRD diffraction structure characterization prepared by embodiment 1.It receives
There is 5 diffraction maximums, Xiang Yingwei respectively at 40.11 °, 46.66 °, 68.08 °, 81.95 ° and 86.49 ° in 2 θ of the angle of diffraction of rice Pd
Metal Pd simple substance diffraction crystal face (111), (200), (220), (311) and (222) characteristic peak.Palladium-silver/polyaniline nano
Composite material has occurred the position of its diffraction maximum a little mobile due to there is the presence of Ag, between Pd and the diffraction maximum of Ag,
Show the generation of bimetallic alloy.
(3) Fig. 4 is palladium-silver/polyaniline nano-composite material EDS figure prepared by embodiment 1, it was demonstrated that Pd in alloy
With the presence of two kinds of elements of Ag.
(4) Fig. 5 is palladium-silver/polyaniline nano-composite material infared spectrum prepared by embodiment 1, in 3442cm-1
It is nearby-NH2With the stretching vibration peak of-NH；In 1569cm-1And 1500cm-1Nearby there are two stronger characteristic peaks, point
The characteristic peak of the quinoid structure (N=Q=N) and benzene formula structure (N-B-N) in doping PANI chain, 1454cm are not belonged to-1For benzene
The stretching vibration characteristic absorption peak of C=C double bond in ring；1339cm-1The characteristic peak at place be C-N characteristic absorption peak, 1044~
1102cm-1Place is the stretching vibration peak of-N=O=N- (electron-like band)；By comparing pure polyaniline (a) and palladium-silver/polyphenyl
Amine nanocomposite (b), it is known that the infrared spectrogram of the two is much like, shows to contain polyaniline knot in nanocomposite
Structure.
(5) Fig. 6 (a) is that Pd/PANI nanocomposite modified electrode prepared by embodiment 1 recycles the electro-catalysis of ethyl alcohol
Volt-ampere curve, the initial oxidation potential to oxidation of ethanol are -0.7V, in forward potential scanning, nano Pd particle modified glassy carbon electrode
Electric current in ethanol solution is gradually increased, and occurs first oxidation peak I near -0.25V；When negative sense scans, electric current exists
It is gradually reduced, until occurring second oxidation peak II near -0.39V；The current density of oxidation peak I is 13.66mA/cm2。
A kind of preparation method of the palladium-silver/polyaniline nano-composite material of embodiment 2
1, a kind of preparation method of palladium-silver/polyaniline nano-composite material, comprising the following steps:
(1) 7mg Pd (NO is weighed3)2Powder, 2.2mg AgNO3Powder, 0.4g SDS are added in reactor；
(2) 40mL water, 10mL ethyl alcohol, 2mL nitric acid (1M) are measured to be mixed and be added in above-mentioned reactor, is passed through nitrogen
Gas 15min；
(3) reactor is placed in ultrasonic cell disruptor, 62.1mg aniline is added to solution, ultrasonic power is
400W, reaction temperature are 21 DEG C, and 80min is reacted in ultrasonic radiation in nitrogen atmosphere；
(4) product is put into -18~-16 DEG C of refrigerator freezing 8h, successively the repeatedly centrifuge separation such as washes through washing, alcohol after demulsification
Afterwards, 8h is dried in 45 DEG C of vacuum ovens to get palladium-silver/polyaniline nano-composite material.
Fig. 6 (b) is that Pd/PANI nanocomposite modified electrode prepared by embodiment 2 recycles volt to the electro-catalysis of ethyl alcohol
Pacify curve, the initial oxidation potential to oxidation of ethanol is -0.7V, and in forward potential scanning, nano Pd particle modified glassy carbon electrode exists
Electric current in ethanol solution is gradually increased, and occurs first oxidation peak I near -0.27V；Negative sense scan when, electric current by
It is decrescence small, until occurring second oxidation peak II near -0.41V；The current density of oxidation peak I is 10.59mA/cm2。
A kind of preparation method of the palladium-silver/polyaniline nano-composite material of embodiment 3
1, a kind of preparation method of palladium-silver/polyaniline nano-composite material, comprising the following steps:
(1) 7mg Pd (NO is weighed3)2Powder, 5mg AgNO3Powder, 0.5g SDS are added in reactor；
(2) 40mL water, 10mL ethyl alcohol, 2.25mL nitric acid (1M) are measured to be mixed and be added in above-mentioned reactor, is led to
Enter nitrogen 17min；
(3) reactor is placed in ultrasonic cell disruptor, to solution be added 113mg aniline, ultrasonic power 400W,
Reaction temperature is 19 DEG C, and 90min is reacted in ultrasonic radiation in nitrogen atmosphere；
(4) product is put into -15~-12 DEG C of refrigerator freezing 16h, successively the repeatedly centrifugation point such as washes through washing, alcohol after demulsification
From rear, dry 32h is in 40 DEG C of vacuum ovens to get palladium-silver/polyaniline nano-composite material.
Fig. 6 (c) is that Pd/PANI nanocomposite modified electrode prepared by embodiment 3 recycles volt to the electro-catalysis of ethyl alcohol
Pacify curve, the initial oxidation potential to oxidation of ethanol is -0.67V, and in forward potential scanning, nano Pd particle modified glassy carbon electrode exists
Electric current in ethanol solution is gradually increased, and occurs first oxidation peak I near -0.24V；Negative sense scan when, electric current by
It is decrescence small, until occurring second oxidation peak II near -0.41V；The current density of oxidation peak I is 10.4mA/cm2。
A kind of preparation method of the palladium-silver/polyaniline nano-composite material of embodiment 4
(1) 7mg Pd (NO is weighed3)2Powder, 5mg AgNO3Powder, 0.5g SDS are added in reactor；
(2) 40mL water, 10mL ethyl alcohol, 2.25mL nitric acid (1M) are measured to be mixed and be added in above-mentioned reactor, is led to
Enter nitrogen 15min；
(3) reactor is placed in ultrasonic cell disruptor, to solution be added 5.6mg aniline, ultrasonic power 400W,
Reaction temperature is 20 DEG C, and 90min is reacted in ultrasonic radiation in nitrogen atmosphere；
(4) product is put into -18~-16 DEG C of refrigerator freezing 6h, successively the repeatedly centrifuge separation such as washes through washing, alcohol after demulsification
Afterwards, 8h is dried in 45 DEG C of vacuum ovens to get palladium-silver/polyaniline nano-composite material.
Fig. 6 (d) is that Pd/PANI nanocomposite modified electrode prepared by embodiment 4 recycles volt to the electro-catalysis of ethyl alcohol
Pacify curve, the initial oxidation potential to oxidation of ethanol is -0.64V, and in forward potential scanning, nano Pd particle modified glassy carbon electrode exists
Electric current in ethanol solution is gradually increased, and occurs first oxidation peak I near -0.26V；Negative sense scan when, electric current by
It is decrescence small, until occurring second oxidation peak II near -0.43V；The current density of oxidation peak I is 8.52mA/cm2。
A kind of preparation method of the palladium-silver/polyaniline nano-composite material of embodiment 5
1, a kind of preparation method of palladium-silver/polyaniline nano-composite material, comprising the following steps:
(1) 28mg Pd (NO is weighed3)2Powder, 48mg AgNO3Powder, 0.6g SDS are added in reactor；
(2) 40mL water, 10mL ethyl alcohol, 2.5mL nitric acid (1M) are measured to be mixed and be added in above-mentioned reactor, is passed through
Nitrogen 20min；
(3) reactor is placed in ultrasonic cell disruptor, 248.4mg aniline is added to solution, ultrasonic power is
400W, reaction temperature are 20 DEG C, and 100min is reacted in ultrasonic radiation in nitrogen atmosphere；
(4) product is put into -14~-12 DEG C of refrigerator freezing 48h, successively the repeatedly centrifugation point such as washes through washing, alcohol after demulsification
From rear, dry 48h is in 35 DEG C of vacuum ovens to get palladium-silver/polyaniline nano-composite material.
Fig. 6 (e) is that Pd/PANI nanocomposite modified electrode prepared by embodiment 5 recycles volt to the electro-catalysis of ethyl alcohol
Pacify curve, the initial oxidation potential to oxidation of ethanol is -0.64V, and in forward potential scanning, nano Pd particle modified glassy carbon electrode exists
Electric current in ethanol solution is gradually increased, and occurs first oxidation peak I near -0.27V；Negative sense scan when, electric current by
It is decrescence small, until occurring second oxidation peak II near -0.39V；The current density of oxidation peak I is 5.83mA/cm2。
Palladium-silver/polyaniline nano-composite material the modified electrode prepared using Examples 1 to 5 is carried out electricity to formic acid and urged
Change active testing, it is found that it has certain electro catalytic activity to formic acid, anti-poisoning capability is preferable, can be used as direct formic acid fuel
Battery catalyst.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (10)
1. a kind of preparation method of palladium-silver/polyaniline nano-composite material, which comprises the following steps:
The surfactant powder of Metal Palladium salt precursor body, metallic silver salt precursor body powder and 0.4~0.6g is added to and is contained
In the alcohol of the nitric acid of 2.00~2.50mL 1M-water mixed solution system；After being passed through inert gas for a period of time, ultrasonic spoke is used
Injection device radiates reaction solution, and aniline is added dropwise into solution, 80~100min of ultrasonic radiation under atmosphere of inert gases；
By after centrifugation, washing, alcohol are washed, the palladium-silver/polyaniline nano is can be obtained in vacuum drying after product freezing demulsification
Composite material.
2. low temperature preparation method according to claim 1, which is characterized in that the surfactant is dodecyl sulphate
Sodium.
3. low temperature preparation method according to claim 1, which is characterized in that alcohol and water in the alcohol-water mixed solution
Volume ratio is 1:1.5~4.
4. low temperature preparation method according to claim 1, which is characterized in that the Metal Palladium salt precursor body is palladium nitrate；
The metallic silver salt precursor body is silver nitrate.
5. low temperature preparation method according to claim 1, which is characterized in that metal palladium salt precursor, metallic silver salt precursor
Body, aniline mass ratio be 7~28:2.2~48:5.6~248.4.
6. low temperature preparation method according to claim 5, which is characterized in that metal palladium salt precursor, metallic silver salt precursor
Body, aniline mass ratio be 7~28:5~12:62.1~113.
7. preparation method according to claim 1, which is characterized in that the time for being passed through inert gas is 15~20min.
8. preparation method according to claim 1, which is characterized in that the power of ultrasonic radiation is 350~400W, reaction temperature
Degree is 19~21 DEG C；Preferably, cooling time is 6~48h, and cryogenic temperature is -18~-12 DEG C；Preferably, vacuum drying temperature
It is 35~45 DEG C, vacuum drying time is 8~48h.
9. palladium-silver/polyaniline nano-composite material that any the method for claim 1~8 is prepared.
10. palladium-silver/polyaniline nano-composite material that any the method for claim 1~8 is prepared as or
Prepare the application in direct alcohol fuel cell or direct methanoic acid fuel cell catalyst.
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