CN111604049B - Reduced graphene oxide loaded two-dimensional coral sheet-shaped palladium nano-catalyst and preparation method thereof - Google Patents
Reduced graphene oxide loaded two-dimensional coral sheet-shaped palladium nano-catalyst and preparation method thereof Download PDFInfo
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- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 title claims abstract description 170
- 229910052763 palladium Inorganic materials 0.000 title claims abstract description 68
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 63
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 63
- 239000011943 nanocatalyst Substances 0.000 title claims abstract description 52
- 235000014653 Carica parviflora Nutrition 0.000 title claims abstract description 48
- 241000243321 Cnidaria Species 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title claims abstract description 30
- 239000003054 catalyst Substances 0.000 claims abstract description 26
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 claims abstract description 19
- 238000009210 therapy by ultrasound Methods 0.000 claims abstract description 17
- 238000006722 reduction reaction Methods 0.000 claims abstract description 15
- 239000012696 Pd precursors Substances 0.000 claims abstract description 14
- 238000001035 drying Methods 0.000 claims abstract description 11
- 239000002245 particle Substances 0.000 claims abstract description 10
- 239000011148 porous material Substances 0.000 claims abstract description 7
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims description 36
- 238000003760 magnetic stirring Methods 0.000 claims description 24
- 238000003756 stirring Methods 0.000 claims description 20
- 229960005070 ascorbic acid Drugs 0.000 claims description 18
- 235000010323 ascorbic acid Nutrition 0.000 claims description 18
- 239000011668 ascorbic acid Substances 0.000 claims description 18
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- 229910021641 deionized water Inorganic materials 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 7
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- 229910003603 H2PdCl4 Inorganic materials 0.000 claims description 4
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- 239000002135 nanosheet Substances 0.000 claims description 3
- 238000005119 centrifugation Methods 0.000 claims description 2
- 229910002093 potassium tetrachloropalladate(II) Inorganic materials 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 11
- 229910052760 oxygen Inorganic materials 0.000 abstract description 11
- 239000001301 oxygen Substances 0.000 abstract description 11
- 230000003197 catalytic effect Effects 0.000 abstract description 10
- 238000006243 chemical reaction Methods 0.000 abstract description 6
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- 239000000243 solution Substances 0.000 description 64
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- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 5
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- 229910052751 metal Inorganic materials 0.000 description 2
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- 230000027756 respiratory electron transport chain Effects 0.000 description 2
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- ZOMNIUBKTOKEHS-UHFFFAOYSA-L dimercury dichloride Chemical class Cl[Hg][Hg]Cl ZOMNIUBKTOKEHS-UHFFFAOYSA-L 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- UQSQSQZYBQSBJZ-UHFFFAOYSA-N fluorosulfonic acid Chemical compound OS(F)(=O)=O UQSQSQZYBQSBJZ-UHFFFAOYSA-N 0.000 description 1
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- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/0009—Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
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Abstract
The invention relates to a reduced graphene oxide loaded two-dimensional coral sheet-shaped palladium nano-catalyst and a preparation method thereof, belonging to the field of catalysts and preparation thereof. In order to solve the problems of low catalytic activity and complex preparation process of the existing palladium catalyst, the invention provides a two-dimensional coral sheet-shaped palladium nano-catalyst loaded by reduced graphene oxide, which is particles with two-dimensional coral sheet-shaped appearance and has a dendritic pore structure, the particle size is 30-100 nm, and the palladium loading amount is 20-40 wt%. The preparation method comprises the following steps: mixing a graphene oxide carrier, a CTAB solution, an AA solution and a palladium precursor solution in a certain mass molar ratio, performing reduction reaction by ultrasonic treatment, and performing centrifugal drying treatment on the solution. The preparation method of the palladium nano catalyst is simple, the catalyst is of a two-dimensional coral sheet structure, and has a dendritic pore structure, so that more active sites are provided for the reaction, and the catalyst has higher catalytic activity in the oxygen reduction reaction.
Description
Technical Field
The invention belongs to the field of catalysts and preparation thereof, and particularly relates to a two-dimensional coral sheet-shaped palladium nano-catalyst loaded with reduced graphene oxide and a preparation method thereof.
Background
In the face of today's increasingly severe energy and environmental crisis, fuel cells play a crucial role in the field of energy development and conversion. Among them, the Oxygen Reduction Reaction (ORR) has received much attention as a basic step in fuel cells. Platinum nanocatalysts are the most commonly used efficient, stable, durable ORR catalysts, but are expensive. Therefore, it is of great significance to develop a catalyst with high catalytic activity, high stability, low cost and easy availability. Palladium as platinum group metal has similar chemical properties, but has poor electrocatalytic activity, and the specific surface area of the palladium nano-particle is increased by improving the surface structure of the palladium nano-particle, so that the palladium nano-particle has potential for further improving the electrocatalytic performance of the palladium nano-particle. However, most of the existing palladium nano-catalysts are spherical particles, and have low activity and catalytic activity in ORR reaction and complex preparation process.
Disclosure of Invention
In order to solve the problems of low catalytic activity and complex preparation process of the existing palladium catalyst, the invention provides a two-dimensional coral sheet-shaped palladium nano-catalyst loaded by reduced graphene oxide and a preparation method thereof.
The technical scheme of the invention is as follows:
a two-dimensional coral sheet-shaped palladium nano-catalyst loaded with reduced graphene oxide is provided, wherein the palladium nano-catalyst is particles with two-dimensional coral sheet-shaped appearance, has a dendritic pore structure, has a particle size of 30-100 nm, and has a palladium loading amount of 20-40 wt%.
A preparation method of a reduced graphene oxide loaded two-dimensional coral sheet-shaped palladium nano-catalyst comprises the following steps:
preparing a graphene oxide carrier, a CTAB (cetyl trimethyl ammonium bromide) solution, an AA (ascorbic acid) solution and a palladium precursor solution in a certain mass molar ratio, adding the graphene oxide carrier into deionized water, performing ultrasonic dispersion treatment in a greenhouse to form a clarified solution, adding the CTAB solution and the AA solution into the obtained solution under the conditions of ultrasonic treatment and magnetic stirring, adding the palladium precursor solution at a certain sample introduction speed, performing reduction reaction on the system at a certain temperature, stopping ultrasonic treatment after the sample introduction of the palladium precursor solution is finished, aging the obtained solution under magnetic stirring for a certain time, and performing centrifugation and drying treatment to obtain the reduced graphene oxide loaded two-dimensional coral-shaped palladium nanosheet catalyst.
Further, the mass molar ratio of the graphene oxide carrier to the CTAB solution to the AA solution to the palladium precursor solution is 133.3-266.7 g: 1-20 mol: 2-6 mol: 0.5 to 2 mol.
Further, the palladium precursor solution comprises the following components: na (Na)2PdCl4、K2PdCl4、H2PdCl4Or Pd (NO)3)2。
Further, the ultrasonic power obtained by ultrasonic dispersion treatment is 300W.
Further, the ultrasonic power of ultrasonic treatment is 300-700W, and the stirring speed of magnetic stirring in the ultrasonic process is 300-600 rpm.
Furthermore, the sampling speed of the palladium precursor solution is 3-7 mL/h.
Further, the temperature of the reduction reaction is 25-45 ℃.
Furthermore, the volume of the solution obtained after the sample injection of the palladium precursor solution is finished is 80-120 mL.
Further, the curing time under magnetic stirring is 0.5-4 h, and the stirring speed of the magnetic stirring in the curing process is 300-600 rpm.
The invention has the beneficial effects that:
1. the palladium nano catalyst prepared by the invention is of a two-dimensional coral sheet structure, is uniformly dispersed, has a dendritic pore structure, has more defects on the surface, provides more active sites for the reaction, and has higher catalytic activity in the oxygen reduction reaction.
2. According to the invention, the preparation of the two-dimensional coral sheet-shaped palladium nano-catalyst loaded with the reduced graphene oxide is realized by an ultrasonic-assisted method, with CTAB (cetyl trimethyl ammonium bromide) as a protective agent and AA (ascorbic acid) as a reducing agent, the operation is simple, and the preparation efficiency of the catalyst is improved.
Drawings
FIG. 1 is a 40000-fold TEM photograph of the reduced graphene oxide-supported two-dimensional coral sheet-like palladium nanocatalyst prepared in example 1;
FIG. 2 is a 400000-fold TEM photograph of the reduced graphene oxide-supported two-dimensional coral sheet-like palladium nanocatalyst prepared in example 1;
FIG. 3 is an HRTEM photograph of the reduced graphene oxide supported two-dimensional coral sheet-like palladium nanocatalyst prepared in example 1;
FIG. 4 is an XRD pattern of the reduced graphene oxide supported two-dimensional coral sheet-shaped palladium nanocatalyst prepared in example 1;
FIG. 5 is an LSV curve of oxygen reduction of the reduced graphene oxide supported two-dimensional coral sheet-shaped palladium nanocatalyst prepared in example 1;
FIG. 6 is an oxygen reduction LSV curve for the commercial Pd/C catalyst described in comparative example 1;
FIG. 7 is a K-L equation fitted curve of oxygen for the reduced graphene oxide-supported two-dimensional coral sheet-shaped palladium nanocatalyst prepared in example 1;
FIG. 8 is a K-L equation fitted curve for the commercial Pd/C catalyst described in comparative example 1.
Detailed Description
The technical solutions of the present invention are further described below with reference to the following examples, but the present invention is not limited thereto, and any modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Example 1
The invention provides an ultrasonic-assisted preparation method of a reduced graphene oxide loaded two-dimensional coral sheet-shaped palladium nano-catalyst, which comprises the following specific steps:
26.67mg of graphene oxide GO is weighed into 84mL of deionized water, and treated by ultrasonic treatment at 300W for 30min at room temperature to be uniformly dispersed to form a brown yellow clear solution. Under the ultrasonic treatment with the ultrasonic power of 600W and the magnetic stirring with the stirring speed of 450rpm, 2mL of 0.1mol/L CTAB solution and 4mL of 0.1mol/L AA solution are added, and 10mL of 0.01mol/L Na is added by a micro-pump at the sampling speed of 5mL/h2PdCl4Reacting the solution at 30 ℃ until the sample introduction is finished, stopping ultrasound, continuously curing for 3h under the magnetic stirring with the stirring speed of 450rpm, centrifuging the obtained solution, removing supernatant, and repeatedly washing the obtained precipitate with deionized waterAnd drying to obtain the reduced graphene oxide loaded two-dimensional coral sheet-shaped palladium nano-catalyst. The microstructure morphology was observed as shown in fig. 1, 2 and 3. The X-ray diffraction was carried out, and the obtained XRD pattern was as shown in FIG. 4.
As can be observed from fig. 1, fig. 2 and fig. 3, the palladium nano-catalyst prepared in the embodiment is a two-dimensional coral sheet-shaped structure, is uniformly dispersed, has a particle size of 30-100 nm, has a palladium loading amount of 20-40 wt%, has a dendritic pore structure on the particle, has more defects on the surface, provides more active sites for the reaction, and thus has higher catalytic activity in the oxygen reduction reaction.
As can be observed from FIG. 4, the sample shows a characteristic diffraction peak of metallic palladium, which proves Pd2+Is reduced to Pd0And successfully loaded on a carrier. Wherein the 2 theta is 40.1 degrees, 46.6 degrees, 68.1 degrees, 82.1 degrees and 86.6 degrees, which respectively correspond to the (111), (200), (220), (311) and (222) crystal planes of the metal palladium, and the synthesized Pd belongs to a face-centered cubic (fcc) structure.
Example 2
The invention provides an ultrasonic-assisted preparation method of a reduced graphene oxide loaded two-dimensional coral sheet-shaped palladium nano-catalyst, which comprises the following specific steps:
26.67mg of graphene oxide GO is weighed into 84mL of deionized water, and treated by ultrasonic treatment at 300W for 30min at room temperature to be uniformly dispersed to form a brownish yellow clear solution. Under the ultrasonic treatment with the ultrasonic power of 500W and the magnetic stirring with the stirring speed of 500rpm, 2mL of 0.1M CTAB solution and 4mL of 0.1M AA solution are added, and 10mL of 0.01M Na is added by a micro-pump at the injection speed of 5mL/h2PdCl4And (3) reacting the solution at 30 ℃ until sample introduction is finished, stopping ultrasound, continuously performing magnetic stirring at the stirring speed of 400rpm, curing for 3 hours, centrifuging the obtained solution, removing supernatant, repeatedly washing the obtained precipitate with deionized water, and drying to obtain the reduced graphene oxide loaded two-dimensional coral sheet-shaped palladium nano-catalyst.
Example 3
The invention provides an ultrasonic-assisted preparation method of a reduced graphene oxide loaded two-dimensional coral sheet-shaped palladium nano-catalyst, which comprises the following specific steps:
weighing 16.45mg of graphene oxide GO into 77mL of deionized water, and carrying out ultrasonic 300W treatment for 30min at room temperature to uniformly disperse the graphene oxide GO to form a brown yellow clear solution. Under the ultrasonic treatment with the ultrasonic power of 600W and the magnetic stirring with the stirring speed of 400rpm, 8mL of 0.1mol/L CTAB solution and 5mL of 5.1 mol/L AA solution are added, and 10mL of 0.01mol/L Na is added by a micro-pump at the injection speed of 5mL/h2PdCl4And (3) reacting the solution at 30 ℃ until sample introduction is finished, stopping ultrasound, continuously performing magnetic stirring at the stirring speed of 500rpm, curing for 3 hours, centrifuging the obtained solution, removing supernatant, repeatedly washing the obtained precipitate with deionized water, and drying to obtain the reduced graphene oxide loaded two-dimensional coral sheet-shaped palladium nano-catalyst.
Comparative example 1
The commercial Pd/C catalyst (Pd/C hydrogenation catalyst) used in the comparative example was produced by national pharmaceutical group chemical reagents, Inc., and the palladium loading was 5 wt%, and the Pd/C catalyst had spherical palladium particles with an average particle size of 4.7 nm.
The reduced graphene oxide supported two-dimensional coral sheet-shaped palladium nano-catalyst prepared in example 1, example 2 and example 3 and the commercial Pd/C catalyst selected in comparative example 1 are applied to an oxygen reduction reaction, and an LSV curve is recorded by a rotating disk electrode method (RDE) for analysis, wherein the specific operation method comprises the following steps:
respectively dispersing 1mg of palladium nano catalyst or commercial Pd/C catalyst and 10 mu L of 0.5% perfluorosulfonic acid solution in 1mL of ultrapure water to obtain slurry with the concentration of 1mg/mL, dripping 10 mu of slurry onto the surface of a glassy carbon electrode, and naturally airing at room temperature to obtain the modified glassy carbon working electrode. The electrode, a platinum sheet electrode and a saturated calomel electrode form a three-electrode system, and a linear scanning voltammetry test (LSV) is carried out in a 0.1mol/L KOH solution saturated by O2, wherein the scanning potential range is 0.1-1.2V (vs. RHE), the scanning speed is 10mV/s, and the rotation speed of a rotating disk electrode is 400, 625, 900, 1225 and 1600 rpm. Wherein oxygen reduction LSV curves of the reduced graphene oxide supported two-dimensional coral sheet-shaped palladium nano-catalyst prepared in example 1 and the commercial Pd/C catalyst prepared in comparative example 1 are respectively shown in figures 5 and 6, the initial potentials and half-wave potentials of examples 1-3 and comparative example 1 are respectively recorded, and the statistical results are shown in Table 1; K-L equation fitting curves of the reduced graphene oxide supported two-dimensional coral sheet-shaped palladium nano-catalyst prepared in example 1 and the commercial Pd/C catalyst described in comparative example 1 are shown in FIG. 7 and FIG. 8, the electron transfer numbers of examples 1 to 3 and comparative example 1 are calculated according to the K-L equation fitting curves respectively, and the statistical results are shown in Table 1.
TABLE 1
As can be observed from fig. 4, fig. 5 and table 1, the palladium nanocatalysts prepared in example 1, example 2 and example 3 both had higher initial potential and half-wave potential in the oxygen reduction reaction than the commercial Pd/C catalyst described in comparative example 1. It can be concluded that the palladium nanocatalysts prepared in the examples show higher catalytic activity than the existing commercial Pd/C catalysts.
As can be seen from fig. 7, fig. 8 and table 1, the reduced graphene oxide supported two-dimensional coral plate-shaped palladium nanocatalysts prepared in examples 1, 2 and 3 all have a larger number of electron transfer in the oxidation-reduction reaction than the commercial Pd/C catalyst described in comparative example 1, i.e., the palladium nanocatalysts prepared in the examples show higher catalytic activity than the existing commercial Pd/C catalyst.
By combining the two-dimensional coral sheet-shaped morphology and the dendritic pore mechanism in the figures 1, 2 and 3, compared with the spherical cluster-shaped structure of the Pd/C catalyst, the palladium nanosheet catalyst has more defects on the surface, provides more active sites for the reaction, and has higher catalytic activity in the oxygen reduction reaction.
Example 4
The invention provides an ultrasonic-assisted preparation method of a reduced graphene oxide loaded two-dimensional coral sheet-shaped palladium nano-catalyst, which comprises the following specific steps:
weighing 20.00mg of graphene oxide GO in 73mL of deionized water, and performing ultrasonic 300W treatment for 30min at room temperature to uniformly disperse the graphene oxide GO to form a brown yellow clear solution. Under the ultrasonic treatment with the ultrasonic power of 400W and the magnetic stirring with the stirring speed of 300rpm, 5mL of 0.1mol/L CTAB solution and 2mL of 0.1mol/L AA solution are added, and 20mL of 0.01mol/L K is added by a micro-pump at the injection speed of 3mL/h2PdCl4And (3) reacting the solution at 25 ℃ until the sample introduction is finished, stopping ultrasound, continuously performing magnetic stirring at the stirring speed of 300rpm, curing for 4 hours, centrifuging the obtained solution, removing supernatant, repeatedly washing the obtained precipitate with deionized water, and drying to obtain the reduced graphene oxide loaded two-dimensional coral sheet-shaped palladium nano-catalyst.
Example 5
The invention provides an ultrasonic-assisted preparation method of a reduced graphene oxide loaded two-dimensional coral sheet-shaped palladium nano-catalyst, which comprises the following specific steps:
weighing 18.00mg of graphene oxide GO in 84mL of deionized water, and carrying out ultrasonic treatment at 300W for 30min at room temperature to uniformly disperse the graphene oxide GO to form a brownish yellow clear solution. Under the ultrasonic treatment with the ultrasonic power of 300W and the magnetic stirring with the stirring speed of 600rpm, 10mL of 0.1mol/L CTAB solution and 2mL of 0.1mol/L AA solution are added, and 6mL of 0.01mol/L K is added by a micro-pump at the sampling speed of 4mL/h2PdCl4And (3) reacting the solution at 45 ℃ until sample introduction is finished, stopping ultrasound, continuously performing magnetic stirring at the stirring speed of 600rpm, curing for 0.5h, centrifuging the obtained solution, removing supernatant, repeatedly washing the obtained precipitate with deionized water, and drying to obtain the reduced graphene oxide loaded two-dimensional coral sheet-shaped palladium nano-catalyst.
Example 6
The invention provides an ultrasonic-assisted preparation method of a reduced graphene oxide loaded two-dimensional coral sheet-shaped palladium nano-catalyst, which comprises the following specific steps:
26.67mg of graphene oxide GO is weighed into 66mL of deionized water, and treated by ultrasonic treatment at 300W for 30min at room temperature to be uniformly dispersed to form a brown yellow clear solution. Under the ultrasonic treatment with the ultrasonic power of 700W and the magnetic stirring with the stirring speed of 550rpm, 12mL of 0.1mol/L CTAB solution and 6mL of 0.1mol/L AA solution are added, and 15mL of 0.01mol/L H is added by a micro-pump at the sampling speed of 6mL/H2PdCl4And (3) reacting the solution at 40 ℃ until the sample introduction is finished, stopping ultrasound, continuously performing magnetic stirring at the stirring speed of 350rpm, curing for 1h, centrifuging the obtained solution, removing supernatant, repeatedly washing the obtained precipitate with deionized water, and drying to obtain the reduced graphene oxide loaded two-dimensional coral sheet-shaped palladium nano-catalyst.
Example 7
The invention provides an ultrasonic-assisted preparation method of a reduced graphene oxide loaded two-dimensional coral sheet-shaped palladium nano-catalyst, which comprises the following specific steps:
weighing 13.33mg of graphene oxide GO in 72mL of deionized water, and carrying out ultrasonic 300W treatment for 30min at room temperature to uniformly disperse the graphene oxide GO to form a brown yellow clear solution. Under the ultrasonic treatment with the ultrasonic power of 400W and the magnetic stirring with the stirring speed of 350rpm, 18mL of 0.1mol/L CTAB solution and 2mL of 0.1mol/L AA solution are added, and 8mL of 0.01mol/L H is added by a micro-pump at the injection speed of 3mL/H2PdCl4And (3) reacting the solution at 42 ℃ until the sample injection is finished, stopping ultrasound, continuously performing magnetic stirring at the stirring speed of 450rpm, curing for 1h, centrifuging the obtained solution, removing supernatant, repeatedly washing the obtained precipitate with deionized water, and drying to obtain the reduced graphene oxide loaded two-dimensional coral sheet-shaped palladium nano-catalyst.
Example 8
The invention provides an ultrasonic-assisted preparation method of a reduced graphene oxide loaded two-dimensional coral sheet-shaped palladium nano-catalyst, which comprises the following specific steps:
weighing 17.35mg of graphene oxide GO in 80mL of deionized water, and carrying out ultrasonic 300W treatment for 30min at room temperature to uniformly disperse the graphene oxide GO to form a brown yellow clear solution. In superUltrasonic treatment with the sound power of 500W and magnetic stirring at the stirring speed of 450rpm are carried out, 20mL of 0.1mol/L CTAB solution and 4mL of 0.1mol/L AA solution are added into the solution, and 18mL of 0.01mol/L Pd (NO) is added into the solution at the sampling speed of 4mL/h by adopting a micro pump3)2And (3) reacting the solution at 35 ℃ until the sample injection is finished, stopping ultrasound, continuously performing aging for 2.5 hours under the magnetic stirring at the stirring speed of 550rpm, centrifuging the obtained solution, removing supernatant, repeatedly washing the obtained precipitate with deionized water, and drying to obtain the reduced graphene oxide loaded two-dimensional coral sheet-shaped palladium nano-catalyst.
Claims (6)
1. A preparation method of a reduced graphene oxide loaded two-dimensional coral flaky palladium nano-catalyst is characterized in that the palladium nano-catalyst is particles with two-dimensional coral flaky morphology and has a dendritic pore structure, the particle size is 30-100 nm, the palladium loading is 20-40 wt%, and the preparation method comprises the following steps:
according to the technical scheme, the method comprises the following steps of (1) preparing a graphene oxide carrier, Cetyl Trimethyl Ammonium Bromide (CTAB), Ascorbic Acid (AA) and a palladium precursor according to the mass molar ratio of 133.3-266.7 g: 2-10 mol: 2-6 mol: 1-2 mol, preparing a graphene oxide carrier, a CTAB solution, an AA solution and a palladium precursor solution; adding a graphene oxide carrier into deionized water, performing ultrasonic dispersion treatment at room temperature to form a clear solution, performing ultrasonic treatment on the solution under the ultrasonic power of 300-700W, performing magnetic stirring at the stirring speed of 300-600 rpm, adding a CTAB solution and an AA solution into the solution, adding a palladium precursor solution at the sampling speed of 3-7 mL/h to perform reduction reaction on the system at a certain temperature, stopping ultrasonic treatment after the palladium precursor solution is subjected to sampling, curing the obtained solution for a certain time under magnetic stirring, and performing centrifugation and drying treatment to obtain the reduced graphene oxide loaded two-dimensional coral-shaped palladium nanosheet catalyst.
2. The preparation method of the reduced graphene oxide supported two-dimensional coral sheet-shaped palladium nano-catalyst as claimed in claim 1, wherein the palladium precursor comprises the following components: na (Na)2PdCl4、K2PdCl4、H2PdCl4Or Pd (NO)3)2。
3. The preparation method of the reduced graphene oxide supported two-dimensional coral sheet-shaped palladium nano-catalyst as claimed in claim 1, wherein the ultrasonic power of the ultrasonic dispersion treatment is 300W.
4. The preparation method of the reduced graphene oxide supported two-dimensional coral sheet-shaped palladium nano-catalyst as claimed in claim 1, wherein the temperature of the reduction reaction is 25-45 ℃.
5. The preparation method of the reduced graphene oxide supported two-dimensional coral sheet-shaped palladium nano-catalyst as claimed in claim 1, wherein the volume of the solution obtained after the palladium precursor solution is injected is 80-120 mL.
6. The preparation method of the reduced graphene oxide supported two-dimensional coral sheet-shaped palladium nano-catalyst as claimed in claim 1, wherein the curing time is 0.5-4 h, and the stirring speed of magnetic stirring during the curing process is 300-600 rpm.
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