CN100353599C - Carbon carried Pd/oxide composite electric catalyst and preparing process thereof - Google Patents
Carbon carried Pd/oxide composite electric catalyst and preparing process thereof Download PDFInfo
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- CN100353599C CN100353599C CNB2005100346212A CN200510034621A CN100353599C CN 100353599 C CN100353599 C CN 100353599C CN B2005100346212 A CNB2005100346212 A CN B2005100346212A CN 200510034621 A CN200510034621 A CN 200510034621A CN 100353599 C CN100353599 C CN 100353599C
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- 239000003054 catalyst Substances 0.000 title claims abstract description 44
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 29
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 28
- 239000002131 composite material Substances 0.000 title claims description 15
- 238000000034 method Methods 0.000 title description 8
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims abstract description 59
- 229910052763 palladium Inorganic materials 0.000 claims abstract description 25
- 229910052751 metal Inorganic materials 0.000 claims abstract description 6
- 239000002184 metal Substances 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims description 4
- 239000000428 dust Substances 0.000 claims description 3
- 239000002105 nanoparticle Substances 0.000 claims description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 abstract description 36
- 239000000446 fuel Substances 0.000 abstract description 23
- 238000002360 preparation method Methods 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 4
- 239000010411 electrocatalyst Substances 0.000 abstract description 3
- 239000002574 poison Substances 0.000 abstract description 3
- 231100000614 poison Toxicity 0.000 abstract description 3
- 229910002651 NO3 Inorganic materials 0.000 abstract description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 abstract description 2
- 238000006056 electrooxidation reaction Methods 0.000 abstract description 2
- 150000001875 compounds Chemical class 0.000 abstract 2
- 239000002245 particle Substances 0.000 abstract 1
- 239000012279 sodium borohydride Substances 0.000 abstract 1
- 229910000033 sodium borohydride Inorganic materials 0.000 abstract 1
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical group OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 20
- 239000000243 solution Substances 0.000 description 19
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 18
- 239000007864 aqueous solution Substances 0.000 description 14
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 12
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 12
- 239000013049 sediment Substances 0.000 description 12
- XTUSEBKMEQERQV-UHFFFAOYSA-N propan-2-ol;hydrate Chemical compound O.CC(C)O XTUSEBKMEQERQV-UHFFFAOYSA-N 0.000 description 11
- 238000013019 agitation Methods 0.000 description 10
- 238000001035 drying Methods 0.000 description 10
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 9
- 230000003197 catalytic effect Effects 0.000 description 9
- 238000002441 X-ray diffraction Methods 0.000 description 8
- 238000007254 oxidation reaction Methods 0.000 description 8
- 229910052697 platinum Inorganic materials 0.000 description 8
- 229910002849 PtRu Inorganic materials 0.000 description 7
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 6
- 239000012153 distilled water Substances 0.000 description 6
- 230000003647 oxidation Effects 0.000 description 6
- 206010013786 Dry skin Diseases 0.000 description 5
- 239000006229 carbon black Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 5
- 239000003792 electrolyte Substances 0.000 description 4
- 229910000510 noble metal Inorganic materials 0.000 description 4
- 150000001298 alcohols Chemical class 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 238000012790 confirmation Methods 0.000 description 3
- 235000011187 glycerol Nutrition 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 101150003085 Pdcl gene Proteins 0.000 description 2
- 229910021069 Pd—Co Inorganic materials 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 230000000035 biogenic effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000002484 cyclic voltammetry Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 1
- 229910001260 Pt alloy Inorganic materials 0.000 description 1
- 244000061456 Solanum tuberosum Species 0.000 description 1
- 235000002595 Solanum tuberosum Nutrition 0.000 description 1
- 241000209140 Triticum Species 0.000 description 1
- 235000021307 Triticum Nutrition 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- DSVGQVZAZSZEEX-UHFFFAOYSA-N [C].[Pt] Chemical compound [C].[Pt] DSVGQVZAZSZEEX-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
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- 238000009835 boiling Methods 0.000 description 1
- 150000001721 carbon Chemical group 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
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- 239000007789 gas Substances 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 229910001960 metal nitrate Inorganic materials 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 229910003445 palladium oxide Inorganic materials 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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Abstract
The present invention relates to a carbon carried palladium /oxide compound electro catalyst and a preparation method thereof. To attach nanometer particles of metal palladium and oxide to the surface of carbon powder, the catalyst forms uniformly distributed carbon carried palladium / oxide compounds; carbon and nitrate are alternately heated by microwaves, and carbon carried oxide is quick prepared in one step. Palladium is deposited on the carbon carried oxide in a mode that PdCl3 is reduced by NaBH4, and the catalyst is obtained. The electrochemical oxidation of the catalyst on the category to alcohol embodies higher activity and poison resistance capability. The catalyst can be directly applied to an alkaline alcohol fuel battery, an alcohol sensor, etc.
Description
Technical field
The present invention relates to a kind of oxide that is used for direct alkaline alcohol types of fuel cells and strengthen non-platinum carbon and carry palladium/oxide catalyst and preparation method thereof, belong to field of energy source materials.
Background technology
Fuel cell is a kind of green energy resource technology.Significant to solving " energy shortage " and " environmental pollution " this two hang-up that the present world faces.Directly alcohol fuel battery not be because fuel need be directly used in generating through reformation, has advantages such as energy density height, low price, volume are little, in light weight, easy to carry, and application prospect is very extensive.
At present, being used for direct alcohol fuel battery (DAFC) anode electrocatalyst mainly is noble metal platinum and platinum alloy.Wherein, PtRu is the maximum catalyst of research, also is to use the most maturation resisting CO poison catalyst [Gojkovi the most widely
, S.L., et a1.Electrochim.Acta, 2003,48,3607], and realized commercialization.Platinum is directly being used the problem that still has in the alcohol fuel battery because it is rare, cost an arm and a leg and easily poisoned by carbon monoxide.Therefore, people pay attention to by platinum metal catalyst is modified, and to improve its catalytic activity, reach the purpose that reduces noble metal dosage in the catalyst, reduces the catalyst cost.Simultaneously, the research of exploitation non-platinum catalyst is also extensively carried out.One of them reasonable approach is to replace acidic electrolyte bath commonly used now with alkaline electrolyte.Acidic electrolyte bath has limited the catalyst use widely, has only corrosion resistant noble metal can supply to select the electro catalytic activity that the platinum performance is higher for use.Catalytic activity is very little in a lot of acid mediums, even does not have active metal (as palladium), and activity of such catalysts can significantly promote in alkaline medium, and selection of catalysts is not subjected to the restriction of noble metal yet.
Traditional liquid basified fuel cell (AFC) is easy to carbonating, and the carbonate deposition of formation is at catalyst surface, thereby lowers efficiency greatly and useful life, and industrialization is restricted.If our imagination in conjunction with the overall merit of AFC and DAFC, adopts the anionic electroconductive film to replace the liquid hydrogen oxide electrolyte, just can not produce problem such as carbonating.
Directly the used fuel of alcohol fuel battery mainly is methyl alcohol now, methyl alcohol has only a carbon atom, it is the simplest pure molecule, in direct alcohol fuel battery is most widely used alcohol, but methyl alcohol is toxic, be to the disagreeableness fuel of environment, want to realize that alcohol fuel battery is movably using in the field of power supplies such as mobile phone, notebook computer and electric motor car etc., other alcohol of necessary exploration or liquid fuel replace methyl alcohol.Wherein, what people were most interested in is ethanol, and it is the simplest chain alcohol molecule, wide material sources, and toxicity is less, is renewable, the environment-friendly type energy.Ethanol can corn, wheat, potato class etc. be raw material with fermentation method production, its raw materials for production are biogenic, are a kind of regenerative resources.The CO that the ethanol complete oxidation is discharged
2With the CO that biogenic growth consumed as raw material
2Quantity maintain an equal level in theory, this can reduce CO2 emission, makes contributions for reducing the whole world " greenhouse effect " gas.In the fuel that can replace methyl alcohol as direct alcohol fuel battery, polyhydroxy alcohols such as ethylene glycol, glycerine also are up-and-coming fuel.They have high boiling point, not volatile, and they are easy to electrochemical oxidation simultaneously.Replace methyl alcohol with the polyhydroxy alcohols, the theoretical current density of fuel cell is bigger.
The catalytic activity that we have attempted using oxide to improve platinum based catalyst is used for direct alkaline alcohol types of fuel cells [Xu and Shen, Chem Commun, 2004,2238], obtain reasonable result, the present invention proposes the anode catalyst that palladium-based catalyst that a kind of new oxide improves catalytic activity is used for direct alkaline alcohol types of fuel cells.Because Pd reserves on earth are Pt 50 times [Savadogo O, et al.Electrochem Commun, 2004,6,105], resource is abundanter.CO at the adsorption strength on the palladium electrode less than its adsorption strength [Ha S on platinum electrode, et al.Fuel Cells, 2004,4,337], so CO does not have the strong of platinum to poisoning of palladium, improves the electro catalytic activity to the alkanol molecule oxidation to a certain extent, thereby is expected to palladium is applied on the fuel cell.
Summary of the invention
The object of the present invention is to provide a kind of novel carbon to carry palladium/oxide composite anode Catalysts and its preparation method, this preparation method is easy, the catalyst that makes can be with methyl alcohol, ethanol, ethylene glycol, glycerine direct catalytic oxidation and chemical energy is converted into electric energy, cheap, excellent performance in alkaline environment.
It is that the nano particle of Metal Palladium and oxide forms equally distributed composite carbon attached to carbon dust surface and carries palladium/complex oxide that carbon of the present invention carries palladium/Pd/oxide composite electric catalyst, and oxide is CeO
2, NiO, Co
3O
4, Mn
3O
4In one or more mixture, the weight ratio of palladium/oxide is 0.5-6: 1.Wherein carbon dust can be activated carbon, graphite powder, carbon fiber, carbosphere.The reasonable weight ratio of the Metal Palladium/oxide in the catalyst is 1-3: 1.
The step of the inventive method is:
(1) prepare the carbon-supported metal oxide earlier, carbon carries oxide and obtains fast with one step of mixture that microwave alternately heats carbon and nitrate;
(2) carry oxide with the isopropanol water solution dispersed carbon, make suspension;
(3) dissolve PdCl with aqueous hydrochloric acid solution
3Add in the described suspension of step (2) ultrasonic agitation;
(4) at the ultrasonic reducing agent aqueous solution that slowly drips down, the sediment that obtains cleans with distilled water, the sediment that obtains after cleaning is dried in 80 ℃ of baking ovens obtain sample.
The preparation method that carbon of the present invention carries oxide is:
(1) a certain proportion of carbon black and metal nitrate are joined in the container, add an amount of solvent, under the ultrasonic wave effect, fully mix, be placed on 80 ℃ of dryings in the baking oven.After the drying above-mentioned sample carried out following microwave heating program: heated 20 seconds, and stopped carrying out repeatedly six times in 60 seconds, obtain corresponding carbon after the reaction system cooling and carry oxide.Solvent is an isopropanol water solution, and alcohol is 1: 20 with the ratio of water, is preferably 1: 8, is generally 1: 3.
(2) carbon of above-mentioned microwave method preparation is carried oxide and place-the container beaker, add an amount of isopropanol water solution, ultrasonic agitation is disperseed, and splashes into PdCl
3Aqueous hydrochloric acid solution, at the ultrasonic slow down quantitative reducing agent aqueous solution that drips, the sediment that obtains cleans with distilled water, is 7 until the pH of the water that cleans again.The sediment that obtains after cleaning dried in 80 ℃ of baking ovens just can obtain corresponding carbon and carry Pd-oxide composite catalyst.The reducing agent aqueous solution is NaBH
4The aqueous solution.
The weight ratio that described carbon carries the palladium/oxide of palladium/metal oxide composite electrocatalyst is 0.5-6: 1, be preferably 1-3: and 1, be generally 1.5-2.5: 1.
Carbon of the present invention carries palladium/oxide composite catalyst performance evaluation with three-electrode system separately, carries out the cyclic voltammetric test on the IM6e electrochemical workstation of German ZAHNERelektrik company, and auxiliary electrode is 3.0cm
2Platinized platinum, reference electrode are Hg/HgO.
Catalyst of the present invention can be with methyl alcohol, ethanol, ethylene glycol, glycerine direct catalytic oxidation and chemical energy is converted into electric energy, cheap, the excellent performance of this catalyst in alkaline environment.Prove through electro-chemical test, shown advantages of high catalytic activity by eelctro-catalyst provided by the invention, be suitable as direct alkaline alcohols fuel cell anode catalyst, compare with the eelctro-catalyst that U.S. E-TEK company produces, the spike potential that rises of eelctro-catalyst oxidation alcohol provided by the invention moves 200mV than E-TEK eelctro-catalyst is negative, and peak current density can be up to four times of E-TEK eelctro-catalyst.On the performance that anti-pure oxidation intermediate poisons, catalyst provided by the invention has showed superior performance [Xu and Shen, J.Power Sources, 2005,142,27].
Description of drawings
Fig. 1 is the transmission electron microscope picture (TEM) of Pd-NiO/C catalyst.
Fig. 2 is 1.0mol dm
-3Methyl alcohol is at 1.0mol dm
-3In the KOH aqueous solution at E-TEK PtRu (2: 1)/C and Pd-Co
3O
4Cyclic voltammetry curve on (2: 1)/C electrode.
Fig. 3 is 1.0mol dm
-3Ethanol is at 1.0mol dm
-3Cyclic voltammetry curve in the KOH aqueous solution on E-TEK PtRu (2: 1)/C and Pd-NiO (3: 1)/C electrode.
Embodiment
Embodiment 1:
Get the 0.20g carbon black and place the 100ml beaker, add 15ml isopropanol water solution (isopropyl alcohol: water=1: 3), splash into the 0.1mol dm of 12.35ml again
-3Co (NO
3)
2The aqueous solution, ultrasonic agitation 10 minutes is placed on 80 ℃ of dryings in the baking oven.After the drying above-mentioned sample carried out following microwave heating program: heated 20 seconds, and stopped carrying out repeatedly six times in 60 seconds, obtain sample after the reaction system cooling, X-ray diffraction confirms that sample is Co
3O
4/ C.
Above-mentioned microwave method prepares Co
3O
4/ C (wt 1: 2) composite material places the 100ml beaker, and (alcohol: water=1: 3), ultrasonic agitation 10 minutes splashes into the 0.1mol dm of 9.4ml then to add the 15ml isopropanol water solution
-3PdCl
3Aqueous hydrochloric acid solution is again at the ultrasonic 1.0mol dm of slow Dropwise 5 ml down
-3NaBH
4The aqueous solution, the sediment that obtains cleans with distilled water, is 7 until the pH of the water that cleans.The sediment that obtains after cleaning dry in 80 ℃ of baking ovens obtain sample, X-ray diffraction confirmation sample is Pd-Co
3O
4/ C.
Embodiment 2:
Get the 0.20g carbon black and place the 100ml beaker, add 15ml isopropanol water solution (isopropyl alcohol: water=1: 3), splash into the 0.1mol dm of 13.10ml again
-3Mn (NO
3)
2The aqueous solution, ultrasonic agitation 10 minutes is placed on 80 ℃ of dryings in the baking oven.After the drying above-mentioned sample carried out following microwave heating program: heated 20 seconds, and stopped carrying out repeatedly six times in 60 seconds, obtain sample after the reaction system cooling, X-ray diffraction confirms that sample is Mn
3O
4/ C.
The Mn of above-mentioned microwave method preparation
3O
4/ C (1: 2) composite material places the 100ml beaker, and (alcohol: water=1: 3), ultrasonic agitation 10 minutes splashes into the 0.1mol dm of 9.4ml then to add the 15ml isopropanol water solution
-3PdCl
3Aqueous hydrochloric acid solution is again at the ultrasonic 1.0mol dm of slow Dropwise 5 ml down
-3NaBH
4The aqueous solution, the sediment that obtains cleans with distilled water, is 7 until the pH of the water that cleans.The sediment that obtains after cleaning dry in 80 ℃ of baking ovens obtain sample, X-ray diffraction confirmation sample is Pd-Mn
3O
4/ C.
Embodiment 3:
Get the 0.20g carbon black and place the 100ml beaker, add 15ml isopropanol water solution (isopropyl alcohol: water=1: 3), splash into the 0.1mol dm of 4.35ml again
-3Ni (NO
3)
2The aqueous solution, ultrasonic agitation 10 minutes is placed on 80 ℃ of dryings in the baking oven.After the drying above-mentioned sample carried out following microwave heating program: heated 20 seconds, and stopped carrying out repeatedly six times in 60 seconds, obtain sample after the reaction system cooling, X-ray diffraction confirms that sample is NiO/C, typical transmission electron microscope picture such as Fig. 1.
NiO/C (1: the 6) composite material of above-mentioned microwave method preparation is placed the 100ml beaker, and (alcohol: water=1: 3), ultrasonic agitation 10 minutes splashes into the 0.1mol dm of 9.4ml then to add the 15ml isopropanol water solution
-3PdCl
3Aqueous hydrochloric acid solution is again at the ultrasonic 1.0mol dm of slow Dropwise 5 ml down
-3NaBH
4The aqueous solution, the sediment that obtains cleans with distilled water, is 7 until the pH of the water that cleans.The sediment that obtains after cleaning dry in 80 ℃ of baking ovens obtain sample, X-ray diffraction confirmation sample is Pd-NiO/C.
Embodiment 4:
Get the 0.20g carbon black and place the 100ml beaker, add 15ml isopropanol water solution (isopropyl alcohol: water=1: 3), splash into the 0.1mol dm of 5.81ml again
-3CeO
2(NO
3)
2The aqueous solution, ultrasonic agitation 10 minutes is placed on 80 ℃ of dryings in the baking oven.After the drying above-mentioned sample carried out following microwave heating program: heated 20 seconds, and stopped carrying out repeatedly six times in 60 seconds, obtain sample after the reaction system cooling, X-ray diffraction confirms that sample is CeO
2/ C.
The CeO of above-mentioned microwave method preparation
2/ C (1: 2) composite material places the 100ml beaker, and (alcohol: water=1: 3), ultrasonic agitation 10 minutes splashes into the 0.1mol dm of 9.4ml then to add the 15ml isopropanol water solution
-3PdCl
3Aqueous hydrochloric acid solution is again at the ultrasonic 1.0mol dm of slow Dropwise 5 ml down
-3NaBH
4The aqueous solution, the sediment that obtains cleans with distilled water, is 7 until the pH of the water that cleans.The sediment that obtains after cleaning dried in 80 ℃ of baking ovens obtain sample.X-ray diffraction confirms that sample is Pd-CeO
2/ C.
Embodiment 5
The catalyst P d-Co that embodiment 1 is made
3O
4It is 0.3mg cm that/C (2: 1) is prepared into carrying capacity
-2The electrode of Pd is at 1.0mol dm
-3KOH+1.0mol dm
-3CH
3Carrying out electrocatalysis oxidation reaction in the OH solution, its spike potential, spike potential, peak current density is respectively-0.58V ,-0.14V, 65mAcm
-2, but the spike potential of the PtRu/C catalyst of E-TEK company, spike potential, peak current density be respectively-0.58V ,-0.11V, 21mA cm
-2(see figure 2).
Embodiment 6
It is 0.3mgcm that Pd-NiO (6: 1)/C Preparation of Catalyst that embodiment 3 is made becomes carrying capacity
-2The electrode of Pd is at 1.0moldm
-3KOH+1.0mol dm
-3C
2H
5Carrying out electrocatalysis oxidation reaction in the OH solution, its spike potential, spike potential, peak current density is respectively-0.62V ,-0.08V, 95mA cm
-2, but the spike potential of the PtRu/C catalyst of E-TEK company, spike potential, peak current density be respectively-0.44V ,-0.03V, 20mA cm
-2Wherein the peak current density of Pd-NiO/C (6: 1) is more than 4 times of PtRu/C, plays spike potential also than the negative 200mV (see figure 3) of having moved of PtRu/C.
Claims (2)
1, a kind of carbon carries palladium/Pd/oxide composite electric catalyst, it is characterized in that this catalyst is that the nano particle of Metal Palladium and oxide forms equally distributed composite carbon attached to carbon dust surface and carries palladium/complex oxide, and oxide is NiO, Co
3O
4, Mn
3O
4In one or more mixture, the weight ratio of palladium/oxide is 0.5-6: 1.
2, carbon according to claim 1 carries palladium/Pd/oxide composite electric catalyst, and the weight ratio that it is characterized in that the Metal Palladium/oxide in the catalyst is 1-3: 1.
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CN108091891B (en) * | 2016-11-22 | 2020-11-03 | 中国科学院大连化学物理研究所 | Anode nano catalyst of alkaline anion exchange membrane fuel cell and preparation and application thereof |
CN109453790A (en) * | 2018-09-17 | 2019-03-12 | 中山大学 | A kind of nanosphere and preparation method thereof of the doped carbon encapsulation transient metal sulfide applied to electro-catalysis |
CN115064716A (en) * | 2022-06-29 | 2022-09-16 | 中国科学院过程工程研究所 | Cerium oxide-palladium/carbon catalyst for formic acid electrooxidation and preparation method thereof |
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2005
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