CN114678549A - Fuel cell catalyst with low precious metal content, preparation method and application thereof - Google Patents
Fuel cell catalyst with low precious metal content, preparation method and application thereof Download PDFInfo
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- 239000003054 catalyst Substances 0.000 title claims abstract description 56
- 239000000446 fuel Substances 0.000 title claims abstract description 12
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000010970 precious metal Substances 0.000 title description 2
- 229910000510 noble metal Inorganic materials 0.000 claims abstract description 36
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 15
- 239000001301 oxygen Substances 0.000 claims abstract description 15
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 11
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 11
- 238000006722 reduction reaction Methods 0.000 claims abstract description 10
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Substances [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 28
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Inorganic materials O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 12
- 150000003839 salts Chemical class 0.000 claims description 12
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- 238000004873 anchoring Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 6
- 239000012286 potassium permanganate Substances 0.000 claims description 5
- XOLBLPGZBRYERU-UHFFFAOYSA-N SnO2 Inorganic materials O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 claims description 4
- VBIXEXWLHSRNKB-UHFFFAOYSA-N ammonium oxalate Chemical compound [NH4+].[NH4+].[O-]C(=O)C([O-])=O VBIXEXWLHSRNKB-UHFFFAOYSA-N 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- XURCIPRUUASYLR-UHFFFAOYSA-N Omeprazole sulfide Chemical compound N=1C2=CC(OC)=CC=C2NC=1SCC1=NC=C(C)C(OC)=C1C XURCIPRUUASYLR-UHFFFAOYSA-N 0.000 claims description 3
- BCKXLBQYZLBQEK-KVVVOXFISA-M Sodium oleate Chemical compound [Na+].CCCCCCCC\C=C/CCCCCCCC([O-])=O BCKXLBQYZLBQEK-KVVVOXFISA-M 0.000 claims description 3
- 229910021627 Tin(IV) chloride Inorganic materials 0.000 claims description 3
- 238000001027 hydrothermal synthesis Methods 0.000 claims description 3
- PJXISJQVUVHSOJ-UHFFFAOYSA-N indium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[In+3].[In+3] PJXISJQVUVHSOJ-UHFFFAOYSA-N 0.000 claims description 3
- KDLHZDBZIXYQEI-UHFFFAOYSA-N palladium Substances [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 3
- UMPKMCDVBZFQOK-UHFFFAOYSA-N potassium;iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[K+].[Fe+3] UMPKMCDVBZFQOK-UHFFFAOYSA-N 0.000 claims description 3
- HPGGPRDJHPYFRM-UHFFFAOYSA-J tin(iv) chloride Chemical compound Cl[Sn](Cl)(Cl)Cl HPGGPRDJHPYFRM-UHFFFAOYSA-J 0.000 claims description 3
- CTENFNNZBMHDDG-UHFFFAOYSA-N Dopamine hydrochloride Chemical compound Cl.NCCC1=CC=C(O)C(O)=C1 CTENFNNZBMHDDG-UHFFFAOYSA-N 0.000 claims description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical class [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 2
- 229910021626 Tin(II) chloride Inorganic materials 0.000 claims description 2
- 229960001149 dopamine hydrochloride Drugs 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 150000002471 indium Chemical class 0.000 claims description 2
- 150000002505 iron Chemical class 0.000 claims description 2
- 150000002696 manganese Chemical class 0.000 claims description 2
- 229910052763 palladium Inorganic materials 0.000 claims description 2
- 150000002940 palladium Chemical class 0.000 claims description 2
- 229910052697 platinum Inorganic materials 0.000 claims description 2
- 150000003057 platinum Chemical class 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 4
- 239000000243 solution Substances 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 6
- 230000010757 Reduction Activity Effects 0.000 description 4
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 3
- 229910052700 potassium Inorganic materials 0.000 description 3
- 239000011591 potassium Substances 0.000 description 3
- 238000003917 TEM image Methods 0.000 description 2
- 239000010406 cathode material Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 239000010431 corundum Substances 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 239000007772 electrode material Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000011031 large-scale manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- PIBWKRNGBLPSSY-UHFFFAOYSA-L palladium(II) chloride Chemical class Cl[Pd]Cl PIBWKRNGBLPSSY-UHFFFAOYSA-L 0.000 description 2
- -1 polytetrafluoroethylene Polymers 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000002243 precursor Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 238000013112 stability test Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- KLFRPGNCEJNEKU-FDGPNNRMSA-L (z)-4-oxopent-2-en-2-olate;platinum(2+) Chemical compound [Pt+2].C\C([O-])=C\C(C)=O.C\C([O-])=C\C(C)=O KLFRPGNCEJNEKU-FDGPNNRMSA-L 0.000 description 1
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910020437 K2PtCl6 Inorganic materials 0.000 description 1
- KEAYESYHFKHZAL-UHFFFAOYSA-N Sodium Chemical compound [Na] KEAYESYHFKHZAL-UHFFFAOYSA-N 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000002815 homogeneous catalyst Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229940049964 oleate Drugs 0.000 description 1
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000005476 size effect Effects 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/90—Selection of catalytic material
- H01M4/9041—Metals or alloys
- H01M4/905—Metals or alloys specially used in fuel cell operating at high temperature, e.g. SOFC
- H01M4/9058—Metals or alloys specially used in fuel cell operating at high temperature, e.g. SOFC of noble metals or noble-metal based alloys
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/90—Selection of catalytic material
- H01M4/9016—Oxides, hydroxides or oxygenated metallic salts
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/90—Selection of catalytic material
- H01M4/9075—Catalytic material supported on carriers, e.g. powder carriers
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Catalysts (AREA)
Abstract
The invention discloses a catalyst, which comprises a metal oxide carrier and monatomic noble metal uniformly loaded on the carrier. The invention also discloses a preparation method of the catalyst and application of the catalyst to an oxygen reduction reaction electrode in a fuel cell. The catalyst of the invention has excellent oxygen reduction reaction activity and stability, greatly reduces the dosage of noble metal, and is superior to commercial noble metal catalysts.
Description
Technical Field
The invention belongs to the field of materials, and particularly relates to a noble metal monatomic supported metal oxide catalyst, a preparation method thereof and application thereof to an electrode material in an oxygen reduction reaction of a fuel cell.
Background
The problems of energy shortage, environmental pollution, global warming and the like are increasingly severe, and the low-carbon, high-efficiency and environment-friendly renewable energy technology is about to be improved. Wind, solar, tidal, geothermal and other forms of green energy have their unique advantages. However, most of them have feed transient characteristics and spatial distribution non-uniformity. Therefore, the key to the efficient utilization of such renewable energy sources is the storage and conversion of the energy sources. Which is a device that converts chemical energy stored in hydrogen and oxygen into electrical energy. However, at present, fuel cells have a great gap for large-scale application due to poor performance, poor stability, high cost and the like.
The slow reaction kinetics and the greatly reduced efficiency are caused by the factors of more complex Oxygen Reduction Reaction (ORR) paths, more intermediate products, higher reaction activation energy and the like of the cathode of the fuel cell. So far, Pt-based noble metal materials have been considered as ideal four-electron ORR catalysts in practical applications. However, the scarcity, high cost and poor stability of Pt have limited the widespread use of this renewable energy technology. Given these limitations, developing low cost, high performance alternatives that combine high activity and high stability is a key and challenging task.
The monatomic catalyst is widely concerned by researchers because of the maximum atom utilization rate, the coordination unsaturated configuration of the active center and the quantum size effect. Because the metal of the monatomic catalyst is loaded on the surface of the carrier in the form of monatomic, the theoretical utilization rate of atoms can reach 100 percent, and the monatomic catalyst has higher catalytic activity along with the increase of the surface free energy; meanwhile, the characteristics of uniform and single composition and structure of the active sites of the homogeneous catalyst are considered. Particularly, the loading capacity of the noble metal in the catalyst is reduced, so that the preparation cost can be greatly reduced, and the method is more favorable for large-scale production and application.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention develops a noble metal monatomic catalyst uniformly loaded on a metal oxide. The catalyst of the present invention can be used for a cathode material of a fuel cell. The catalyst of the invention can greatly reduce the dosage of noble metal and obtain excellent oxygen reduction activity and stability. The catalyst of the invention has simple preparation process, mild reaction condition and no harsh conditions such as high temperature and high pressure.
The technical scheme of the invention is as follows:
in a first aspect, the invention discloses a catalyst comprising a support and noble metal monoatomic atoms uniformly anchored to the surface thereof.
Preferably, the ratio of the single atom number of the carrier to the single atom number of the noble metal is 360 to (0.1-5).
Preferably, the carrier is In2O3、Fe3O4、SnO2Or MnO2One or more of the above; the noble metal single atom is Pt or Pd.
The second aspect of the invention discloses a preparation method of the catalyst, which comprises the following steps:
(1) dispersing metal salt required by preparing a metal oxide carrier into the solution and uniformly mixing;
(2) sequentially adding an anchoring agent and noble metal salt into the solution obtained in the step (1) and uniformly mixing;
(3) carrying out hydrothermal reaction on the solution obtained in the step (2);
(4) separating, washing and drying the mixture obtained in the step (3) to obtain solid matters;
(5) and (4) roasting the solid obtained in the step (4) to obtain the catalyst.
Preferably, the metal salt of step (1) is one of a soluble indium salt, manganese salt, tin salt or iron salt.
Preferably, the metal salt in step (1) is one of indium nitrate, potassium permanganate, tin tetrachloride or potassium ferrate.
Preferably, the anchoring agent is one of ammonium oxalate, dopamine hydrochloride or sodium oleate. The anchoring agent can accurately anchor metal ions, the addition amount can be judged according to a specific reaction system, and the anchoring agent is stable and does not need any protection.
Preferably, the noble metal salt precursor in the step (3) is one of platinum salt and palladium salt, such as one or more of potassium chloroplatinate, platinum acetylacetonate, potassium chloroplatinate, palladium chloride and other noble metal salts; the adding amount of the noble metal salt precursor is controlled to be 360 to (0.1-5) the atomic number ratio of the carrier to the noble metal in the product.
Preferably, the hydrothermal temperature in the step (4) is 120-180 ℃ and the time is 12-24 h.
In a third aspect the invention discloses the use of the catalyst for cathode materials in fuel cells.
The invention has the beneficial effects that:
1. the catalyst with noble metal monoatomic atoms anchored and supported on metal oxide is prepared for the first time and is used for the oxygen reduction reaction electrode of the fuel cell. The present invention anchors noble metal single atom on metal oxide carrier to reduce the consumption of noble metal greatly and raise the activity of catalyst. Meanwhile, the catalyst has good stability due to the strong interaction (anchoring) of the noble metal and the carrier. The content of the single-atom noble metal is controllable, and the single-atom noble metal is uniformly distributed on the surface of the carrier, so that active sites of the carrier are fully exposed. The catalyst of the present invention is used for a cathode electrode material in a fuel cell, can improve oxygen reduction activity of the fuel cell and has long-term stability.
2. According to the preparation method, a hydrothermal method is adopted, noble metal atoms are uniformly loaded on the surface of the metal oxide under a mild condition, and the ratio of the single atom number of the carrier to the single atom number of the noble metal is controlled to be 360: 0.1-5. The noble metal is used in a small amount, but the activity of the catalyst is still high.
3. The carrier selected by the invention is metal oxide In2O3、Fe3O4、SnO2Or MnO2And the like. The catalyst is used as an oxygen reduction reaction electrode, and the metal oxide carrier can keep stable and is not corroded.
4. The noble metal monoatomic atom of the catalyst provided by the invention is anchored with the metal oxide carrier through interaction, so that the internal electronic structure is optimized, and the overpotential of the cathode oxygen reduction reaction is reduced, as shown in figure 3.
5. The cost of the metal carrier supported noble metal atom catalyst is lower than that of a commercial catalyst, and the metal carrier supported noble metal atom catalyst is suitable for large-scale production and application.
Drawings
FIG. 1 shows MnO prepared in example 12XRD profile of the supported Pt catalyst.
FIG. 2 shows MnO prepared in example 12TEM image of Pt-supported catalyst.
FIG. 3 shows MnO prepared in example 12Oxygen reduction activity LSV curve of the Pt-supported catalyst.
FIG. 4 shows MnO prepared in example 12Stability test curve of the supported Pt catalyst.
Detailed Description
The technical solutions of the present invention are described in detail below by examples, and the following examples are only exemplary and can be used only for explaining and explaining the technical solutions of the present invention, but not construed as limiting the technical solutions of the present invention. In the embodiments of the present application, those who do not specify a specific technique or condition, and those who do follow the existing techniques or conditions in the field, and those who do not specify a manufacturer or a material used, are general products that can be obtained by purchasing.
Example 1:
1.58g of potassium permanganate KMnO4The solid was dissolved in 30mL of deionized water and 20mL of 35.5g L-1Ammonium oxalate (NH4)2C2O4·H2Dropwise adding the O solution to KMnO4In solution; after stirring for 0.5h, potassium chloroplatinate K is added2PtCl6The solid was transferred to the above mixture and stirred at room temperature for another 1 h. Transferring the mixed solution to a polytetrafluoroethylene lining, and placing the polytetrafluoroethylene lining in a stainless steel autoclave for reaction at 180 ℃ for 24 hours. After cooling to room temperature, the mixture was washed repeatedly and filtered, and dried at 105 ℃ for 12 hours. The obtained grey black powder is placed in a corundum crucible and calcined for 2 hours at the room temperature of 450 ℃.
15.8mg, 47.4mg, 79mg, 110.6mg and 158.0mg of K were added according to the above procedure2PtCl6Can obtain Pt/MnO2The atomic number ratio is (1-10): 356 sample of catalyst.
FIG. 1 is an XRD plot of five catalyst samples obtained, with FIG. 1 showing only alpha and beta phases MnO2Diffraction characteristics ofAnd (4) characterizing peaks, and not showing any diffraction peaks related to Pt species. FIG. 2 shows Pt/MnO2TEM image of a sample of the catalyst with an atomic number ratio of 5: 356, MnO can be seen from FIG. 22The support is linear and the surface is free of any particles or clusters related to Pt.
Example 2:
preparation of Pd/MnO2The same procedure as in example 1 was repeated except that palladium chloride was used in the catalyst sample having a number ratio of (1 to 10): 191.
Example 3:
1.2g of indium nitrate In (NO)3)3·4.5H2O solid was dissolved in 40mL deionized water and 20mL of 18.5g L-1Sodium oleate C17H33CO2Na solution is added dropwise to In (NO)3)3In the solution, the sodium oleate serving as an anchoring agent also plays a role in constructing a surface active alkali environment, and the solution is stirred for 0.5 h. Will K2PtCl6The solid was transferred to the above mixture and stirred at room temperature for another 1 h. The mixture was then transferred to a teflon liner and placed in a stainless steel autoclave for 12h at 180 ℃. After cooling to room temperature, the mixture was washed with cyclohexane and absolute ethanol (1:4) several times and dried at 105 ℃ for 12 hours. The obtained powder was placed in a corundum crucible and calcined at 450 ℃ for 2h at room temperature.
Adding K in an amount of 36.0mg, 72.0mg and 108.0mg, respectively, according to the above steps2PtCl6Can obtain Pt/ln2O3The catalyst sample has an atomic number ratio of (3-9) to 170.
Example 4:
preparation of Pt/Fe2O3The catalyst sample with the atomic number ratio of (3-7) to 350 uses potassium ferrate. The procedure is as in example 1.
Example 5:
preparation of Pt/SnO2Tin tetrachloride is used for the catalyst sample with the atomic number ratio of (3-7) to 165.
The procedure is as in example 1.
Oxygen reduction activity tests were performed using different catalyst samples prepared in examples 1-5, and the results are shown in table 1 and fig. 3. Table 2 shows the actual content of noble metal in the catalyst of example 1.
As can be seen from table 1 and fig. 3, the samples of the catalysts of the present invention in each ratio have excellent oxygen reduction catalytic activity. As can be seen from Table 2, the actual content of Pt is between 0.1 and 3 wt%. The consumption of noble metal is less, and the cost is lower than that of the commercial Pt.
Table 1 oxygen reduction catalytic activity of the catalyst of the invention compared to commercial Pt
Table 2 actual content of noble metal Pt in the catalyst of example 1
| Catalyst sample | Pt/MnO2 | Pt content (w.t.%) |
| Example 1 | Pt/MnO2＝1∶356 | 0.18 |
| Example 1 | Pt/MnO2＝3∶356 | 0.79 |
| Example 1 | Pt/MnO2＝5∶356 | 1.34 |
| Example 1 | Pt/MnO2＝7∶356 | 1.64 |
| Example 1 | Pt/MnO2＝10∶356 | 2.70 |
FIG. 4 shows MnO prepared in example 12Supported Pt (Pt/MnO)25: 356) stability test curve of the catalyst. As can be seen from FIG. 4, Pt/MnO2The stability of the catalyst at 5: 356 was superior to commercial Pt/C.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A catalyst comprising a support and noble metal atoms uniformly anchored to the surface of the support.
2. The catalyst according to claim 1, wherein the atomic ratio of the carrier to the noble metal is 360: (0.1-5).
3. The catalyst of claim 1, wherein the support is In2O3、Fe3O4、SnO2Or MnO2One of (1); the noble metal is one of Pt or Pd.
4. A method for preparing a catalyst according to any one of claims 1 to 3, comprising the steps of:
(1) dispersing metal salt required by preparing a metal oxide carrier into the solution and uniformly mixing;
(2) sequentially adding an anchoring agent and noble metal salt into the solution obtained in the step (1) and uniformly mixing;
(3) carrying out hydrothermal reaction on the solution obtained in the step (2);
(4) separating, washing and drying the mixture obtained in the step (3) to obtain solid matters;
(5) and (4) roasting the solid obtained in the step (4) to obtain the catalyst.
5. The method of claim 4, wherein the metal salt of step (1) is one of a soluble indium salt, manganese salt, tin salt, or iron salt.
6. The method according to claim 5, wherein the metal salt in the step (1) is one of indium nitrate, potassium permanganate, tin tetrachloride and potassium ferrate.
7. The method according to claim 4, wherein the anchoring agent in step (2) is one of ammonium oxalate, dopamine hydrochloride or sodium oleate.
8. The method according to claim 4, wherein the noble metal salt of step (2) is one of a platinum salt and a palladium salt.
9. The preparation method according to claim 4, wherein the hydrothermal temperature in the step (3) is 120-180 ℃ and the time is 12-24 hours.
10. Use of the catalyst according to any one of claims 1 to 3 for an oxygen reduction reaction electrode in a fuel cell.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115814789A (en) * | 2022-11-25 | 2023-03-21 | 安徽师范大学 | Coated Pd-based catalyst, preparation method thereof and method for treating hexavalent chromium in water body |
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