CN104148058A - Method for improving activity of carbon-supported platinum based catalyst - Google Patents
Method for improving activity of carbon-supported platinum based catalyst Download PDFInfo
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- CN104148058A CN104148058A CN201410134002.XA CN201410134002A CN104148058A CN 104148058 A CN104148058 A CN 104148058A CN 201410134002 A CN201410134002 A CN 201410134002A CN 104148058 A CN104148058 A CN 104148058A
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- based catalyst
- platinum based
- carbon
- platinum
- activity
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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
Abstract
The invention provides a method for improving the activity of a carbon-supported platinum based catalyst. The method comprises the following steps: ultrasonically dispersing the platinum based catalyst in concentrated sulfuric acid, and dipping at 20-80 DEG C for 20-60 minutes; and subsequently washing to neutral by using secondary deionized water and drying at 40-80 DEG C to obtain the high-activity platinum based catalyst. By virtue of strong oxidizing property and dewatering property of concentrated H2SO4, the impurities adsorbed on the surface of the platinum based catalyst are oxidized and removed, so that more active sites are exposed on the surface of the platinum based catalyst, and the property of the platinum based catalyst is effectively improved. Compared with an unprocessed platinum based catalyst, the carbon-supported platinum based catalyst which is processed by concentrated sulfuric acid shows relatively high activity in catalytic reaction of methyl alcohol, has relatively high resistance to toxicity of intermediate products of carbon monoxide, formic acid, formaldehyde and the like and has stability, so that the efficiency of a fuel cell is effectively improved and the service life of the fuel cell is effectively prolonged.
Description
Technical field
The invention belongs to composite material technical field, relate to a kind of method that carbon carries type platinum based catalyst activity that improves, be mainly used in the hydrogen reduction catalytic reaction in methanol fuel cell.
Background technology
Fuel cell is a kind ofly will to be present in chemical energy in fuel and oxidant and to be converted into the TRT of electric energy.Fuel cell has the advantages such as generating efficiency is high, low in the pollution of the environment, and becomes a kind of more satisfactory generation technology.Yet the key factor of the development of restriction fuel cell and application is for Cathodic oxygen reduction catalyst.At present, the raw material as cathodic oxygen reduction catalyst is mainly that carbon carries type platinum based catalyst.But that the performance of carbon-carried platinum-based catalyst directly affects is active to methyl alcohol hydrogen reduction in the reaction of catalysis methanol, anti methanol toxication ability and stability, and then affect efficiency and the service life of fuel cell.Therefore, the performance tool of raising carbon-carried platinum-based catalyst is of great significance.
Summary of the invention
The object of this invention is to provide a kind of method that improves carbon-carried platinum-based catalyst activity.
The present invention improves the method that carbon carries type platinum based catalyst activity, is to be scattered in the concentrated sulfuric acid (mass concentration is 70～98%) platinum based catalyst is ultrasonic impregnation process 20～60 min at 20～80 ℃; Then with secondary deionized water washing to neutral, dry at 40～80 ℃, obtained highly active platinum based catalyst.
Described platinum based catalyst is the platinum based catalyst that utilizes traditional many alcohol reducing process or organic sol method to prepare.
The performance test of the carbon-carried platinum-based catalyst of below parchmentizing being managed is analyzed.
Fig. 1 is the XRD figure of the carbon-carried platinum-based catalyst after not activated carbon carried platinum-based catalyst and activation.As can be seen from Figure 1, the particle diameter of the carbon-carried platinum-based catalyst after activation processing obviously diminishes.
Fig. 2 is the CV curve map of carbon-carried platinum-based catalyst after not activated carbon carried platinum-based catalyst and activation.As can be seen from Figure 2, at dense H
2sO
4effect under, the active sites of platinum (111) crystal face has increased because the desorption peaks area of H has had obvious increase on platinum (111) crystal face, and the active area of all crystal faces has increased by 7.5 m
2g
-1.
Fig. 3 is the CO curve map of carbon-carried platinum-based catalyst after not activated carbon carried platinum-based catalyst and activation.As can be seen from Figure 3, by dense H
2sO
4the CO desorption peaks active area of the carbon-carried platinum-based catalyst after activation processing has increased 12 m
2g
-1.
Fig. 4 be not activated carbon carried platinum-based catalyst with activation after carbon-carried platinum-based catalyst CV curve map in methyl alcohol.The peak current that compares two kinds of platinum based catalysts, result is that after activation, the peak current of platinum based catalyst is the peak current twice that does not activate platinum based catalyst, and take-off potential is also forward, so activates rear active obviously enhancing with the concentrated sulfuric acid.
Fig. 5 is the CA curve map of carbon-carried platinum-based catalyst after not activated carbon carried platinum-based catalyst and activation.As shown in Figure 5, activated carbon carried platinum-based catalyst stability is not δ
t>=500 s (%)=75, dense H
2sO
4carbon-carried platinum-based catalyst δ after activation
t>=500 s (%)=80.The stability of the carbon-carried platinum-based catalyst of explanation after concentrated sulfuric acid activation processing obviously strengthens.
In sum, the present invention utilizes dense H
2sO
4strong oxidizing property and dehydration property, oxidation is removed and to be adsorbed on the impurity on platinum based catalyst surface, thereby makes the surface of platinum based catalyst expose more avtive spot, thereby has effectively improved the performance of platinum based catalyst.Compare with untreated platinum based catalyst, in the reaction of the carbon-carried platinum-based catalyst of processing through the concentrated sulfuric acid at catalysis methanol, show stronger activity, the poisoning capability of the intermediate products such as stronger anti-carbon monoxide, formic acid, formaldehyde, have more stability, thereby effectively improved efficiency and the service life of fuel cell.
Accompanying drawing explanation
Fig. 1 is the XRD figure of the carbon-carried platinum-based catalyst after not activated carbon carried platinum-based catalyst and activation.
Fig. 2 is the CV curve map of carbon-carried platinum-based catalyst after not activated carbon carried platinum-based catalyst and activation.
Fig. 3 is the CO curve map of carbon-carried platinum-based catalyst after not activated carbon carried platinum-based catalyst and activation.
Fig. 4 be not activated carbon carried platinum-based catalyst with activation after carbon-carried platinum-based catalyst CV curve map in methyl alcohol.
Fig. 5 be not activated carbon carried platinum-based catalyst with activation after carbon-carried platinum-based catalyst after CA curve map.
The specific embodiment
Below by specific embodiment to dense H of the present invention
2sO
4the preparation method of optimization of catalysts is described further.
embodiment 1:take 20 mg PtRu/C catalyst, join the dense H of 2 mL
2sO
4(98%), be ultrasonicly uniformly dispersed to catalyst; Be placed in and under room temperature, flood 30 min; Suction filtration,, dries in 60 ℃ of baking ovens to neutral with secondary deionized water washing.Carry out electrochemical property test: its dehydrogenation peak area is 31.7 m
2g
-1, the area of CO desorption peaks is 20.9 m
2g
-1.
embodiment 2:take 20 mg PtIr/C catalyst, join the dense H of 2 mL
2sO
4(98%),, be ultrasonicly uniformly dispersed to catalyst, be placed in and at 30 ℃, flood 20 min; Suction filtration,, dries in 60 ℃ of baking ovens to neutral with secondary deionized water washing.Carry out electrochemical property test.It is at dense H
2sO
4in active area than untreated many 5.11 m
2g
-1; The active area of CO is than untreated many 3.32 m
2g
-1.
embodiment 3:take 20 mg PtPd/C catalyst, join the dense H of 2 mL
2sO
4(70%), be ultrasonicly uniformly dispersed to catalyst, be placed in and at 40 ℃, flood 60 min; Suction filtration,, dries in 50 ℃ of baking ovens to neutral with secondary deionized water washing.Carry out electrochemical property test.It is at dense H
2sO
4in active area than untreated many 12.89 m
2g
-1; The active area of CO is than untreated many 9.61 m
2g
-1.
embodiment 4:take 20 mg PtPdIr/C catalyst, join the dense H of 2 mL
2sO
4(95%), be ultrasonicly uniformly dispersed to catalyst, be placed in and at 50 ℃, flood 30 min; Suction filtration,, dries in 60 ℃ of baking ovens to neutral with secondary deionized water washing.Carry out electrochemical property test: it is at dense H
2sO
4in active area than untreated many 4.47 m
2g
-1; The active area of CO is than untreated many 6.10 m
2g
-1.
Claims (5)
1. improving the method that carbon carries type platinum based catalyst activity, is to be scattered in the concentrated sulfuric acid platinum based catalyst is ultrasonic, impregnation process 20～60 min at 20～80 ℃; Then with deionized water washing, dry, obtained highly active platinum based catalyst.
2. improve as claimed in claim 1 the method that carbon carries type platinum based catalyst activity, it is characterized in that: described platinum based catalyst is the platinum based catalyst that utilizes traditional many alcohol reducing process or organic sol method to prepare.
3. improve as claimed in claim 1 the method that carbon carries type platinum based catalyst activity, it is characterized in that: the mass concentration of the described concentrated sulfuric acid is 70～98%.
4. improve as claimed in claim 1 the method that carbon carries type platinum based catalyst activity, it is characterized in that: deionized water used is secondary deionized water.
5. improve as claimed in claim 1 the method that carbon carries type platinum based catalyst activity, it is characterized in that: described baking temperature is 40～80 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410134002.XA CN104148058A (en) | 2014-04-04 | 2014-04-04 | Method for improving activity of carbon-supported platinum based catalyst |
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|---|---|---|---|
| CN201410134002.XA CN104148058A (en) | 2014-04-04 | 2014-04-04 | Method for improving activity of carbon-supported platinum based catalyst |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106410222A (en) * | 2015-07-31 | 2017-02-15 | 通用汽车环球科技运作有限责任公司 | Oxidative Control of Pore Structure in Carbon-Supported PGM-Based Catalysts |
| CN109216715A (en) * | 2018-08-02 | 2019-01-15 | 安徽科技学院 | It is a kind of rapidly and efficiently to improve the active method of business platinum ruthenium catalyst |
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| CN1774827A (en) * | 2004-02-23 | 2006-05-17 | 卡塔勒公司 | Supported catalyst for fuel cell, method of manufacturing the same, and fuel cell |
| CN101411014A (en) * | 2006-03-31 | 2009-04-15 | 丰田自动车株式会社 | Electrode catalyst for fuel cell and method for producing the same |
| CN101780409A (en) * | 2009-01-20 | 2010-07-21 | 复旦大学 | Method of modifying platinum base formic acid electrocatalyst |
| CN103495432A (en) * | 2013-09-11 | 2014-01-08 | 重庆大学 | Method for preparing efficient stable fuel cell catalyst |
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2014
- 2014-04-04 CN CN201410134002.XA patent/CN104148058A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1774827A (en) * | 2004-02-23 | 2006-05-17 | 卡塔勒公司 | Supported catalyst for fuel cell, method of manufacturing the same, and fuel cell |
| CN101411014A (en) * | 2006-03-31 | 2009-04-15 | 丰田自动车株式会社 | Electrode catalyst for fuel cell and method for producing the same |
| CN101780409A (en) * | 2009-01-20 | 2010-07-21 | 复旦大学 | Method of modifying platinum base formic acid electrocatalyst |
| CN103495432A (en) * | 2013-09-11 | 2014-01-08 | 重庆大学 | Method for preparing efficient stable fuel cell catalyst |
Non-Patent Citations (2)
| Title |
|---|
| 毕丽晓，: ""Pt基合金纳米结构催化剂对甲醇氧化电催化特点的研究"", 《中国学位论文全文数据库》 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106410222A (en) * | 2015-07-31 | 2017-02-15 | 通用汽车环球科技运作有限责任公司 | Oxidative Control of Pore Structure in Carbon-Supported PGM-Based Catalysts |
| CN109216715A (en) * | 2018-08-02 | 2019-01-15 | 安徽科技学院 | It is a kind of rapidly and efficiently to improve the active method of business platinum ruthenium catalyst |
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Application publication date: 20141119 |
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