CN110261449A - A kind of preparation method and catalysis electrode of gas sensor catalysis electrode - Google Patents
A kind of preparation method and catalysis electrode of gas sensor catalysis electrode Download PDFInfo
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- CN110261449A CN110261449A CN201910403328.0A CN201910403328A CN110261449A CN 110261449 A CN110261449 A CN 110261449A CN 201910403328 A CN201910403328 A CN 201910403328A CN 110261449 A CN110261449 A CN 110261449A
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- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
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Abstract
The invention discloses the preparation method and catalysis electrode of a kind of gas sensor catalysis electrode, this programme is separately added into high polymer and coagulating agent first in the tetrafluoroethene suspension containing catalyst, forms mixing suspension；Then obtained mixing suspension is formed a film on polytetrafluoroethylene (PTFE) basilar memebrane by the way of vacuum filtration, is prepared catalysis electrode.Scheme provided by the invention can not only make Catalytic Layer be evenly distributed, and can be realized on electrode Catalytic Layer load capacity it is controllable, furthermore the high mechanical strength of catalysis electrode obtained, and entire simple production process is at low cost, practical.
Description
Technical field
The present invention relates to gas sensor technologies, and in particular to the technology of gas sensor catalysis electrode.
Background technique
Electro-catalysis is that electrode, the electric charge transfer on electrolyte interface is made to accelerate a kind of catalytic action of reaction.Thus for
Electro catalytic electrode is then a very important component in entire gas sensor for gas sensor.How to prepare as a result,
Catalysis electrode suitable for gas sensor is then the extremely important technical problem in this field.
For example, disclosing a kind of gas sensor catalysis electrode in open CN107966483A Chinese invention patent application
Preparation method, the program are sprayed to platinum catalyst on polytetrafluoroethylene (PTFE) basilar memebrane by the way of gas spray gun, thus
Catalysis electrode is made.The catalysis electrode of this preparation method preparation, can reduce the waste of platinum, to reduce production cost；But
The Catalytic Layer for being is not uniform enough, thickness is different, and the mechanical strength of catalysis electrode is low.
Summary of the invention
For the problems of the preparation method of existing gas sensor catalysis electrode, a kind of new gas sensing is needed
Device catalysis electrode preparation method.
For this purpose, the purpose of the present invention is to provide a kind of preparation method of gas sensor catalysis electrode, the preparation method
So that catalysis electrode Catalytic Layer is evenly distributed, and on electrode Catalytic Layer load capacity it is controllable；The present invention furthermore provides base
In the gas sensor catalysis electrode that this preparation method is formed, the high mechanical strength of the catalysis electrode；Thus overcome existing skill
Defect present in art.
In order to achieve the above object, the preparation method of gas sensor catalysis electrode provided by the invention, comprising:
It in the tetrafluoroethene suspension containing catalyst, is separately added into high polymer and coagulating agent stirs evenly, formed mixed
Close suspension；
By obtained mixing suspension by the way of vacuum filtration, forms a film, prepare on polytetrafluoroethylene (PTFE) basilar memebrane
Catalysis electrode.
Further, the catalyst is platinum, ruthenium, gold, silver, one of lead etc. or a variety of.
Further, the high polymer be carbon nanotube, it is cellulose nano-fibrous, one of chitin nano fiber or
It is a variety of.
Further, the coagulating agent includes the acid reagents such as sulfuric acid, hydrochloric acid, nitric acid.
Further, for the preparation method while vacuum filtration, being stirred to mixing suspension makes mix suspending
Liquid stable homogeneous, when suction filtration, enable catalyst to be more uniformly adhered on polytetrafluoroethylene (PTFE) basilar memebrane.
Further, the preparation method is stirred mixing suspension by mechanical stirring paddle, the bottom end of agitating paddle
Apart from mixing suspension bottom end 0.5-2.0cm, the speed of rotation of agitating paddle is to making mixing suspension be formed with small rotating vortex.
In order to achieve the above object, gas sensor catalysis electrode provided by the invention uses above-mentioned preparation method
The preparation method of gas sensor catalysis electrode provided by the invention, by the way that high polymer is added, effective improve is urged
The dispersibility of agent；And by the way of vacuum filtration, so that its Catalytic Layer is evenly distributed and can be realized to Catalytic Layer on electrode
Controllable, the high mechanical strength of catalysis electrode obtained of load capacity, and entire simple production process, it is at low cost, it is practical.
Detailed description of the invention
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
Fig. 1 is that suction method prepares gas sensor catalysis electrode method flow diagram in this example；
Fig. 2 is the schematic diagram of the Vacuum filtration device used in this example.
Each label declaration in figure:
1, agitating paddle；2, filter cup；3, mixing suspension；
4, Catalytic Layer；5, polytetrafluoroethylene (PTFE) basilar memebrane；
6, fixed aluminium folder；7, sand core filtering head；8, liquid-collecting bottle.
Specific embodiment
In order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, tie below
Conjunction is specifically illustrating, and the present invention is further explained.
For the problems of existing gas sensor catalysis electrode, this example provides a kind of side using vacuum filtration
Formula prepares gas sensor catalysis electrode, so catalysis electrode Catalytic Layer is not only made to be evenly distributed and can be realized to electrode
Controllable, and the high mechanical strength of catalysis electrode obtained of upper Catalytic Layer load capacity；Entire simple production process simultaneously, cost
It is low.
Accordingly, this example is mainly included the following steps using the process that vacuum filtration method prepares gas sensor catalysis electrode
(referring to Fig. 1):
In the tetrafluoroethene suspension containing catalyst, it is separately added into high polymer and coagulating agent is uniformly mixed, formed mixed
Close suspension；
Mixing suspension will be formed by the way of being filtered by vacuum while stirring, on polytetrafluoroethylene (PTFE) basilar memebrane at
Film, to prepare the catalysis electrode for gas sensor.
This example approach is had by the way that high polymer is added in the polytetrafluoroethylene teflon soliquoid containing catalyst based on high polymer
There is certain adhesive effect possessed by high strand, realizes the dispersibility for improving catalyst；Simultaneously also can be improved it is subsequent at
Film strength.
Matched, it is formed a film by the way of vacuum filtration, so that its Catalytic Layer is evenly distributed and can be realized to electricity
Catalytic Layer load capacity is controllable on extremely.
For this purpose, this example carries out mechanical stirring in vacuum filtration, to mixing suspension, keep mixing suspension uniform steady
Calmly, catalyst is enable more to be uniformly adhered on polytetrafluoroethylene (PTFE) basilar memebrane when suction filtration, the preparation mixing that can be quantified is outstanding
Catalyst in supernatant liquid, due to filter during catalyst it is almost lossless, so as to realize to Catalytic Layer load capacity can
Control.
On this basis, this programme is being embodied, and one in platinum, ruthenium, gold, silver, lead etc. can be used in catalyst therein
Kind is a variety of.
Matched high polymer be added preferably uses carbon nanotube, cellulose nano-fibrous, chitin nano fiber
One of or multiple combinations.Film strength be can effectively improve into using high polymer so, prevent electrode from cracking.
Matched coagulating agent be added preferably uses the acid reagents such as sulfuric acid, hydrochloric acid, nitric acid.Using condensation so
Agent can be such that tetrafluoroethene suspension agglomerates rapidly, and such sour curdling agent easily removes.
This example while vacuum filtration, needs to be stirred mixing suspension when carrying out vacuum filtration film forming.
Preferably, it is preferred that and the bottom end of mechanical stirring paddle is apart from mix suspending by the way that mechanical stirring paddle is added in mixing suspension
Liquid bottom end 0.5-2.0cm, preferably 1.0cm, furthermore the mechanical stirring paddle speed of rotation is adjusted to making mixing suspension have small rotation
Vortex.
Gas is prepared based on vacuum filtration method come illustratively this programme below by way of a specific example for above scheme
The implementation process of body sensor catalysis electrode.
Referring to fig. 2 which shows the structural schematic diagram of the device in this example for being filtered by vacuum.As seen from the figure,
The Vacuum filtration device mainly includes agitating paddle 1, filter cup 2, Catalytic Layer 4, polytetrafluoroethylene (PTFE) basilar memebrane 5, fixed aluminium folder 6, sand
Core filtering head 7 and liquid-collecting bottle 8.
In this Vacuum filtration device, liquid-collecting bottle 8 can make in such a way that agitating paddle 1 stirs as filtrate Collective bottle
Mixing suspension stable homogeneous in filter bowl 2.
Polytetrafluoroethylene (PTFE) basilar memebrane 5 is placed in sand core filtering head 7 and filter cup 2, and is clamped by fixed aluminium folder 6.By
This, in vacuum filtration, when the mixing suspension containing catalyst passes through, catalyst can be uniformly adhered to polytetrafluoroethyl-ne
On alkenyl counterdie 5.
The implementation process that gas sensor catalysis electrode is prepared based on this Vacuum filtration device is mainly included the following steps:
1) firstly, preparing the tetrafluoroethene suspension for containing a certain amount of catalyst, high polymer and coagulating agent, stirring is equal
It is even, form mixing suspension.
2) mixing suspension is added in this Vacuum filtration device, adjusting makes agitating paddle bottom end and mixing suspension bottom end
Distance is 0.5-2.0cm, and the speed of rotation of agitating paddle is to making mixing suspension be formed with small rotating vortex.
3) it is filtered by vacuum, filtering terminates that catalysis electrode can be obtained.In vacuum filtration, to the mix suspending in filter cup
Liquid carries out mechanical stirring, makes mixing suspension stable homogeneous, and when suction filtration enables catalyst to be more uniformly adhered to polytetrafluoro
On ethylene basilar memebrane, can the catalyst prepared in mixing suspension quantitatively, catalyst is almost lossless during suction filtration, from
And it can be realized to the controllable of Catalytic Layer load capacity.
The basic principles, main features and advantages of the present invention have been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (7)
1. the preparation method of gas sensor catalysis electrode characterized by comprising
In the tetrafluoroethene suspension containing catalyst, it is separately added into high polymer and coagulating agent, forms mixing suspension；
By obtained mixing suspension by the way of vacuum filtration, forms a film on polytetrafluoroethylene (PTFE) basilar memebrane, prepare catalysis
Electrode.
2. preparation method according to claim 1, which is characterized in that the catalyst is platinum, and ruthenium, gold is silver-colored, in lead etc.
It is one or more.
3. preparation method according to claim 1, which is characterized in that the high polymer is carbon nanotube, cellulose nanometer
Fiber, one of chitin nano fiber or a variety of.
4. preparation method according to claim 1, which is characterized in that the coagulating agent includes the acid such as sulfuric acid, hydrochloric acid, nitric acid
Property reagent.
5. preparation method according to claim 1, which is characterized in that the preparation method is right while vacuum filtration
Mixing suspension is stirred, and makes mixing suspension stable homogeneous.
6. preparation method according to claim 5, which is characterized in that the preparation method is by mechanical stirring paddle to mixing
Suspension is stirred, and the bottom end of mechanical stirring paddle is apart from mixing suspension bottom end 0.5-2.0cm, and the speed of rotation of agitating paddle is extremely
Mixing suspension is set to be formed with small rotating vortex.
7. gas sensor catalysis electrode, which is characterized in that the gas sensor catalysis electrode is appointed using in claim 1-6
Preparation method described in one is made.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85102225A (en) * | 1985-04-01 | 1986-09-24 | 中国科学院长春应用化学研究所 | Method for manufacturing thin waterproof gas diffusion electrode |
| US20130137566A1 (en) * | 2011-11-28 | 2013-05-30 | Hae-Jin Kim | Nanoporous photocatalyst having high specific surface area and high crystallinity and method for preparing the same |
| CN103926284A (en) * | 2013-01-11 | 2014-07-16 | 深圳市深安旭传感技术有限公司 | Porous gas diffusion electrode production method |
| CN105932300A (en) * | 2016-05-30 | 2016-09-07 | 昆明纳太科技有限公司 | Gas diffusion electrode and preparation method thereof |
| CN108404989A (en) * | 2018-04-28 | 2018-08-17 | 东华大学 | A kind of preparation method of Aurum clusters/graphene catalytic membrane |
| CN109560310A (en) * | 2017-09-25 | 2019-04-02 | 粟青青 | A kind of fuel cell very low platinum carrying amount self-humidifying membrane electrode and preparation method thereof |
-
2019
- 2019-05-15 CN CN201910403328.0A patent/CN110261449A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85102225A (en) * | 1985-04-01 | 1986-09-24 | 中国科学院长春应用化学研究所 | Method for manufacturing thin waterproof gas diffusion electrode |
| US20130137566A1 (en) * | 2011-11-28 | 2013-05-30 | Hae-Jin Kim | Nanoporous photocatalyst having high specific surface area and high crystallinity and method for preparing the same |
| CN103926284A (en) * | 2013-01-11 | 2014-07-16 | 深圳市深安旭传感技术有限公司 | Porous gas diffusion electrode production method |
| CN105932300A (en) * | 2016-05-30 | 2016-09-07 | 昆明纳太科技有限公司 | Gas diffusion electrode and preparation method thereof |
| CN109560310A (en) * | 2017-09-25 | 2019-04-02 | 粟青青 | A kind of fuel cell very low platinum carrying amount self-humidifying membrane electrode and preparation method thereof |
| CN108404989A (en) * | 2018-04-28 | 2018-08-17 | 东华大学 | A kind of preparation method of Aurum clusters/graphene catalytic membrane |
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Application publication date: 20190920 |