CN101350409B - Method for preparation of membrane electrode of proton exchange film fuel cells - Google Patents
Method for preparation of membrane electrode of proton exchange film fuel cells Download PDFInfo
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- CN101350409B CN101350409B CN2007101305844A CN200710130584A CN101350409B CN 101350409 B CN101350409 B CN 101350409B CN 2007101305844 A CN2007101305844 A CN 2007101305844A CN 200710130584 A CN200710130584 A CN 200710130584A CN 101350409 B CN101350409 B CN 101350409B
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Abstract
The invention discloses a method for preparing the membrane electrode of a proton-exchange membrane fuel battery, including the preparation of a diffusion layer. Catalyst slurry is used to prepare a catalyst layer by screen printing; the catalyst layer and the proton-exchange layer are combined, so that the catalyst layer is located between the diffusion layer and the proton-exchange layer, wherein, the fixed content of the catalyst slurry is 5-15 weight percent. In accordance with the method, the fixed content of catalyst slurry is 5-15 weight percent, the printing precision of catalyst layer can be controlled within 0.5-3 nanometers during the process of catalyst layer preparation by screen printing, thereby, the thickness of the catalyst layer is more even and the electrochemical reaction of the membrane electrode can be conducted more evenly. As a result, the power generating capability of the membrane electrode is improved.
Description
Technical field
The invention relates to a kind of preparation method of membrane electrode of fuel batter with proton exchange film.
Background technology
Fuel cell is the Blast Furnace Top Gas Recovery Turbine Unit (TRT) that chemical energy is converted into electric energy, can be used as the power supply of domestic power supply, middle-size and small-size power station, portable electric appts, also can be used as the electrical source of power of motor vehicle, space flight, submarine etc.Fuel cell has advantages such as energy density is big, energy conversion efficiency is high, environmental protection, is considered to efficient, energy-conservation, eco-friendly generation technology of 21 century.
Wherein the membrane electrode of Proton Exchange Membrane Fuel Cells is a core component, and membrane electrode generally comprises proton exchange membrane and Catalytic Layer.At present, membrane electrode preparation method comprises uses catalyst pulp and conductive agent pulp preparation Catalytic Layer and diffusion layer respectively, and Catalytic Layer, diffusion layer and proton exchange membrane is laminated, makes Catalytic Layer between diffusion layer and proton exchange membrane.
The general rubbing method that adopts prepares Catalytic Layer and diffusion layer in the prior art.People also attempt preparing Catalytic Layer and diffusion layer by printing process (as silk screen printing).Silk screen printing be utilize photosensitive material to make screen printing forme by photomechanical method (making the silk screen hole of picture and text part on the screen printing forme is through hole, and the silk screen hole of non-graphic part is plugged), extruding by scraper plate during printing, the printing slurry is transferred on the stock by the mesh of picture and text part, formed the picture and text the same with original copy.Silk screen printing has advantages such as equipment is simple, easy to operate, cost is low, and it is simple and easy and with low cost to make a plate, and adaptability is strong.
For example, CN 1560949A discloses the preparation method of the ultra-thin core component of a kind of used in proton exchange membrane fuel cell, steps of the method are: (1) adopts screen printing apparatus that slip is coated on the transfer medium, the preparation coat film, it is 10 that described slip contains mass ratio: the catalyst of 2-5: 50-1000: 2-5: 1-5, proton exchange resins, water-repelling agent, solvent and surfactant; (2) by conveyer coat film is sent into drying tunnel, dry under nitrogen or inert gas shielding, the 100-130 ℃ condition, the long 1-20m of drying tunnel wherein, the film walking speed is 0.3-2m/min; (3) proton exchange membrane is placed between the catalyst layer of two coat films, form three-in-one assembly, by conveyer assembly is sent into hot-pressing processing in the calender, the roll-in temperature is 80-130 ℃, and pressure is 0.2-2MPa, and the film walking speed is 0.3-2m/min; (4) divest the PTFE film of proton exchange membrane both sides, promptly obtain ultra-thin core component.The catalyst layer thickness that this method obtains≤10 μ m, single monolayer thick usually≤5 μ m.This method has been utilized advantages such as the equipment of silk screen printing is simple, easy to operate, cost is low, and it is simple and easy and with low cost to make a plate, and adaptability is strong, but the membrane electrode power generation performance that obtains is bad.
Summary of the invention
The objective of the invention is provides a kind of membrane electrode of fuel batter with proton exchange film preparation method that can access the good membrane electrode of power generation performance in order to overcome the bad shortcoming of power generation performance of the membrane electrode of fuel batter with proton exchange film that existing method obtains.
The present inventor finds, the bad main cause of the power generation performance of the membrane electrode of fuel batter with proton exchange film that existing method obtains is that the thickness low LCL of Catalytic Layer of membrane electrode is even, and the electrochemical reaction of membrane electrode is inhomogeneous.The present inventor also finds, when the preparation catalyst pulp, if the solid content of catalyst pulp is controlled within the specific limits, then using catalyst pulp to prepare in the process of Catalytic Layer by silk screen print method, can control the printing precision of Catalytic Layer, promptly control the thickness of Catalytic Layer, make the thickness of Catalytic Layer more even, thereby the electrochemical reaction of membrane electrode is carried out equably, and then improve the power generation performance of membrane electrode.
The invention provides a kind of preparation method of membrane electrode of fuel batter with proton exchange film, this method comprises the preparation diffusion layer; Use catalyst pulp to prepare Catalytic Layer by silk screen print method; Catalytic Layer and diffusion layer and proton exchange membrane is laminated, make Catalytic Layer between diffusion layer and proton exchange membrane, wherein, the solid content of catalyst pulp is 5-15 weight %.
According to method provided by the invention, the solid content of used catalyst pulp is 5-15 weight %, then using catalyst pulp to prepare in the process of Catalytic Layer by silk screen print method, the printing precision that can control Catalytic Layer is in the scope of 0.5-3 micron, make the thickness of Catalytic Layer more even, the electrochemical reaction of membrane electrode is carried out equably, thereby improve the power generation performance of membrane electrode.
Description of drawings
Fig. 1 is the current-voltage curve by the fuel cell of the membrane electrode assembling of embodiment 1 and Comparative Examples 1;
Fig. 2 is the electric current-power curve by the fuel cell of the membrane electrode assembling of embodiment 1 and Comparative Examples 1;
Fig. 3 is by embodiment 3 and 4 and the current-voltage curve of the fuel cell of the membrane electrode of Comparative Examples 3 assembling;
Fig. 4 is by embodiment 3 and 4 and electric current-the power curve of the fuel cell of the membrane electrode of Comparative Examples 3 assembling.
Embodiment
The preparation method of membrane electrode of fuel batter with proton exchange film provided by the invention comprises the preparation diffusion layer; Use catalyst pulp to prepare Catalytic Layer by silk screen print method; Catalytic Layer and diffusion layer and proton exchange membrane is laminated, make Catalytic Layer between diffusion layer and proton exchange membrane, wherein, the solid content of catalyst pulp is 5-15 weight %.
According to membrane electrode preparation method provided by the invention, the concrete preparation method of membrane electrode includes but not limited to following two kinds:
(1) the conductive agent slurry is coated on the conductive substrates, obtains diffusion layer; The catalyst pulp silk screen printing on the diffusion layer that obtains, is obtained Catalytic Layer; Then that Catalytic Layer, diffusion layer and proton exchange membrane is laminated, make Catalytic Layer between diffusion layer and proton exchange membrane;
(2) conductive agent slurry silk screen is coated on the conductive substrates, obtains diffusion layer; The catalyst pulp silk screen printing on proton exchange membrane, is obtained Catalytic Layer; Then that Catalytic Layer, diffusion layer and proton exchange membrane is laminated, make Catalytic Layer between diffusion layer and proton exchange membrane.
The composition of described catalyst pulp can be its conventional ingredient, and for example catalyst pulp can contain catalyst, Nafion solution and solvent.Catalyst pulp can adopt conventional preparation method, and is for example, that catalyst, Nafion solution and solvent is even.In the present invention, it is 5-15 weight % that the consumption of catalyst, Nafion solution and solvent makes the solid content of the catalyst pulp that obtains, and is preferably 7-13.5 weight %.Solid content described herein is that total amount with catalyst pulp is a benchmark, and is meant the total content of Nafion resin in catalyst and the Nafion solution.The weight ratio of Nafion solution and solvent can be 1: 0.02-5 is preferably 1: 0.05-3.
Described catalyst can be any catalyst that is used for fuel cell, is preferably in Pt/C catalyst, Pt-Ru/C catalyst, the Pt-Cr/C catalyst one or more.Described solvent can be used to prepare the solvent of catalyst pulp for this area is any, is preferably in water, isopropyl alcohol, ethanol, the glycerol one or more.Described Nafion solution has been conventionally known to one of skill in the art, and Nafion solution is 1 by weight ratio: the Nafion resin (high fluoride resin) of 15-16: 3-4, lower alcohol (ethanol, propyl alcohol or isopropyl alcohol) and water are formed.
According to membrane electrode preparation method provided by the invention, can adopt conventional screen printing apparatus to prepare Catalytic Layer, for example, can use manual type, auto-manual system or full rotation type screen process press; The silk-screen half tone; Sdueegee (rubber flaps of stainless steel scraper and 30 °～90 ° of hardness).
The process of silk screen printing comprise screen printing forme covered on the printed material (as, diffusion layer or proton exchange membrane), catalyst pulp is placed on the screen printing forme, the picture and text that make catalyst pulp see through screen printing forme with the catalyst pulp on the sdueegee blade coating screen printing forme partly are printed onto on the printed material, thereby finish one-step print.Because the solid content of catalyst pulp of the present invention in the scope of 5-15 weight %, therefore can be controlled the precision of printing well, the print thickness that makes above-mentioned one-step print is the 0.5-3 micron.If desired, can carry out repeatedly above-mentioned printing, reach the desired thickness of Catalytic Layer until the gross thickness of printing.Because the printing thickness of one-step print is very little very accurate, therefore the thickness of the Catalytic Layer that obtains is even.In addition, after printing catalyst pulp, can make the catalyst pulp drying of printing, dry temperature can be 20-160 ℃, and dry method can be drying means such as the infrared dehydration or the oven dry of routine.
Screen printing forme can adopt conventional method to make, and for example, silk screen (30-400 purpose nylon mesh, terylene silk net or stainless steel cloth that plain weave is knitted) is fixed on (aluminum screen frame, wooden screen frame or steel screen frame) on the screen frame; Photoresists are coated on the silk screen; Use then and cover the exposure of light film, develop, unexposed photoresists are removed formation can see through the picture and text part of slurry, thereby obtains screen printing forme.
According to membrane electrode preparation method provided by the invention, except Catalytic Layer prepared by said process, other step can be identical with existing method for preparing membrane electrode.
Described proton exchange membrane can be various proton exchange membrane well known in the art.Proton exchange membrane can be commercially available, for example the Nafion film of being produced by E.I.Du Pont Company.
In the process of preparation diffusion layer, can adopt conventional various painting methods that the conductive agent slurry is coated on the conductive substrates, adopt aforesaid method for printing screen under the preferable case.The conductive agent solid content of slurry can be its customary amount, and in order to control the printing precision of diffusion layer, the conductive agent content of conductive agent slurry is 5-60 weight % among the present invention, is preferably 7-50 weight %.The conductive agent slurry contains conductive agent, binding agent and solvent, and the weight ratio of conductive agent and binding agent is 1: 0.02-5 is preferably 1: 0.04-2.
The kind of described conductive substrates has been conventionally known to one of skill in the art, and for example, conductive carrier can be carbon paper.The kind of described conductive agent has been conventionally known to one of skill in the art, and for example, conductive agent is selected from one or more in activated carbon, acetylene black, the graphite carbon black.The kind of described binding agent has been conventionally known to one of skill in the art, and for example, binding agent is selected from one or more in polytetrafluoroethylene, hexafluoropropylene, the polyvinyl fluoride.Described solvent types has been conventionally known to one of skill in the art, and for example, solvent is selected from one or more in water, isopropyl alcohol, ethanol, the glycerol.
The method that Catalytic Layer, diffusion layer and proton exchange membrane is laminated can be the laminating method of routine, for example by hot pressing.The condition of hot pressing comprises that the temperature of hot pressing is 60-200 ℃, is preferably 110-160 ℃; The pressure of hot pressing is the 0.1-10 MPa, is preferably the 0.5-4 MPa; Hot pressing time is 1-10 minute, is preferably 1-5 minute.
Below by embodiment the present invention is described in more detail.
Embodiment 1
This embodiment is used to illustrate the preparation method of membrane electrode of fuel batter with proton exchange film provided by the invention.
With carbon paper (toray TGP-H-060) as conductive substrates.Conductive substrates is placed on the vacuum absorbing platform of screen process press, with screen printing forme (40 purpose nylon wires, the thickness of screen printing forme is 25 microns) cover on the conductive substrates, conductive agent slurry (contain weight ratio be 1: 0.08: 4 carbon black, polytetrafluoroethylene and ethanol) is printed onto on the conductive substrates, and the thickness of one-step print is 7 microns.Every printing once utilizes infrared heating device after 120 ℃ of temperature are carried out drying, republishes for the second time, and be 49 up to the thickness of diffusion layer.350 ℃ of following sintering 30 minutes.
The conductive substrates of printed diffusion layer is placed on the vacuum absorbing platform of screen process press, screen printing forme (100 purpose nylon wires, the thickness of screen printing forme are 20 microns) is covered on the conductive substrates of printed diffusion layer.(solid content of this catalyst pulp is 9 weight % with catalyst pulp, contain Pt/C catalyst, isopropyl alcohol and ethanol mixed solvent, Nafion solution, the weight ratio of isopropyl alcohol, ethanol and Nafion solution is 0.3: 0.3: 1, Nafion solution contains the Nafion resin of 5 weight %) be printed onto on the diffusion layer, the thickness of one-step print is 2 microns.Every printing once behind 100 ℃ of temperature dryings, republishes for the second time, is 16 microns up to the thickness of Catalytic Layer.
The conductive substrates of two above-mentioned printed diffusion layers that obtain and Catalytic Layer is cut into the square of 5 centimetres of 5 cm x, be attached to the nafion film (NRE212 of area symmetrically greater than conductive substrates, DUPONT company product) both sides, wherein, Catalytic Layer contacts with the nafion film, send into 130 ℃ of hot presses, 2 MPa hot pressing 2 minutes then, obtain membrane electrode b1.The active area of membrane electrode is 25 centimetres
2
Comparative Examples 1
This Comparative Examples is used to illustrate the preparation method of existing membrane electrode of fuel batter with proton exchange film.
With carbon paper (toray TGP-H-060) as conductive substrates.Conductive substrates is placed on the vacuum absorbing platform of screen process press, with screen printing forme (40 purpose nylon wires, the thickness of screen printing forme is 25 microns) cover on the conductive substrates, conductive agent slurry (contain weight ratio be 1: 0.05: 4 carbon black, polytetrafluoroethylene and ethanol) is printed onto on the conductive substrates, and the thickness of one-step print is 6 microns.Every printing once utilizes infrared heating device after 120 ℃ of temperature are carried out drying, republishes for the second time, and be 54 microns up to the thickness of diffusion layer.350 ℃ of following sintering 30 minutes.
The conductive substrates of printed diffusion layer is placed on the vacuum absorbing platform of screen process press, screen printing forme (100 purpose nylon wires, the thickness of screen printing forme are 20 microns) is covered on the conductive substrates of printed diffusion layer.(catalyst content of this catalyst pulp is 16 weight % with catalyst pulp, contain Pt/C catalyst, isopropyl alcohol and ethanol mixed solvent, Nafion solution, the weight ratio of isopropyl alcohol, ethanol and Nafion solution is 0.2: 0.2: 0.8, Nafion solution contains the Nafion resin of 5 weight %) be printed onto on the diffusion layer, the thickness of one-step print is 5 microns.Every printing once behind 100 ℃ of temperature dryings, republishes for the second time, is 16 microns up to the thickness of Catalytic Layer.
The conductive substrates of two above-mentioned printed diffusion layers that obtain and Catalytic Layer is cut into the square of 5 centimetres of 5 cm x, be attached to the nafion film (NRE212 of area symmetrically greater than conductive substrates, DUPONT company product) both sides, wherein, Catalytic Layer contacts with the nafion film, send into 130 ℃ of hot presses, 2 MPa hot pressing 2 minutes then, obtain membrane electrode a1.The active area of membrane electrode is 25 centimetres
2
Embodiment 2
This embodiment is used to measure the performance of the membrane electrode of embodiment 1 preparation.
With battery separator the membrane electrode b1 that embodiment 1 prepares is assembled into fuel cell A1, and measure the output voltage of fuel cell under different current densities and power output after the above-mentioned activation: fuel cell is connected with an external power according to following method, and the flow straightener of on this circuit, connecting, closed external power switch, regulate the electric current of external power, make battery begin discharge, the working temperature of control battery is 50 ℃, after discharge a period of time, behind the output voltage stabilization of battery, be recorded as initial voltage, change the discharge current density of battery then, the output voltage of record battery under different discharge current densities, the result is as shown in Figure 1, and the product of the output voltage under the discharge current density of counting cell and this discharge current density is the power output of battery under this discharge current density, and the result as shown in Figure 2.
Comparative Examples 2
This Comparative Examples is used to measure the performance of the membrane electrode of Comparative Examples 1 preparation.
According to the method identical with embodiment 2, with battery separator the membrane electrode a1 of Comparative Examples 1 preparation is assembled into fuel cell A1, and measures output voltage and the power output of the fuel cell A1 after the activation, the result is respectively as depicted in figs. 1 and 2.
In Fig. 1, b1 represents the current-voltage curve of fuel cell B1, and a1 represents the current-voltage curve of fuel cell A1.As can be seen from Figure 1, under identical discharge current density condition, the discharge voltage of fuel cell B1 is greater than the discharge voltage of fuel cell A1.
In Fig. 2, b1 represents electric current-power curve of fuel cell B1, and a1 represents electric current-power curve of fuel cell A1.As can be seen from Figure 2, under identical discharge current density condition, the power output of fuel cell B1 illustrates and adopts the inventive method can significantly improve the discharge performance of the membrane electrode that makes greater than the power output of fuel cell A1.
Embodiment 3
This embodiment is used to illustrate the preparation method of membrane electrode of fuel batter with proton exchange film provided by the invention.
With carbon paper (toray TGP-H-060) as conductive substrates.Conductive substrates is placed on the vacuum absorbing platform of screen process press, with screen printing forme (40 purpose nylon wires, the thickness of screen printing forme is 25 microns) cover on the conductive substrates, conductive agent slurry (contain weight ratio be 1: 0.08: 4 carbon black, polytetrafluoroethylene and ethanol) is printed onto on the conductive substrates, and the thickness of one-step print is 7 microns.Every printing once utilizes infrared heating device after 120 ℃ of temperature are carried out drying, republishes for the second time, and be 49 microns up to the thickness of diffusion layer.350 ℃ of following sintering 30 minutes.
The conductive substrates of printed diffusion layer is placed on the vacuum absorbing platform of screen process press, screen printing forme (100 purpose nylon wires, the thickness of screen printing forme are 20 microns) is covered on the conductive substrates of printed diffusion layer.(solid content of this catalyst pulp is 12 weight % with catalyst pulp, contain Pt/C catalyst, isopropyl alcohol and ethanol mixed solvent, Nafion solution, the weight ratio of isopropyl alcohol, ethanol and Nafion solution is 2: 1: 1, Nafion solution contains the Nafion resin of 5 weight %) be printed onto on the diffusion layer, the thickness of one-step print is 3 microns.Every printing once behind 100 ℃ of temperature dryings, republishes for the second time, is 15 microns up to the thickness of Catalytic Layer.
The conductive substrates of two above-mentioned printed diffusion layers that obtain and Catalytic Layer is cut into the square of 5 centimetres of 5 cm x, be attached to the nafion film (NRE212 of area symmetrically greater than conductive substrates, DUPONT company product) both sides, wherein, Catalytic Layer contacts with the nafion film, send into 130 ℃ of hot presses, 2 MPa hot pressing 2 minutes then, obtain membrane electrode b2.The active area of membrane electrode is 25 centimetres
2
Embodiment 4
This embodiment is used to illustrate the preparation method of membrane electrode of fuel batter with proton exchange film provided by the invention.
With carbon paper (toray TGP-H-060) as conductive substrates.Conductive substrates is placed on the vacuum absorbing platform of screen process press, with screen printing forme (40 purpose nylon wires, the thickness of screen printing forme is 25 microns) cover on the conductive substrates, conductive agent slurry (contain weight ratio be 1: 0.08: 4 carbon black, polytetrafluoroethylene and ethanol) is printed onto on the conductive substrates, and the thickness of one-step print is 7 microns.Every printing once utilizes infrared heating device after 120 ℃ of temperature are carried out drying, republishes for the second time, and be 49 microns up to the thickness of diffusion layer.350 ℃ of following sintering 30 minutes.
The conductive substrates of printed diffusion layer is placed on the vacuum absorbing platform of screen process press, screen printing forme (100 purpose nylon wires, the thickness of screen printing forme are 20 microns) is covered on the conductive substrates of printed diffusion layer.(solid content of this catalyst pulp is 6.5 weight % with catalyst pulp, contain Pt/C catalyst, isopropyl alcohol and ethanol mixed solvent, Nafion solution, the weight ratio of isopropyl alcohol, ethanol and Nafion solution is 1.2: 1: 1, Nafion solution contains the Nafion resin of 5 weight %) be printed onto on the diffusion layer, the thickness of one-step print is 1.5 microns.Every printing once behind 100 ℃ of temperature dryings, republishes for the second time, is 15 microns up to the thickness of Catalytic Layer.
The conductive substrates of two above-mentioned printed diffusion layers that obtain and Catalytic Layer is cut into the square of 5 centimetres of 5 cm x, be attached to the nafion film (NRE212 of area symmetrically greater than conductive substrates, DUPONT company product) both sides, wherein, Catalytic Layer contacts with the nafion film, send into 130 ℃ of hot presses, 2 MPa hot pressing 2 minutes then, obtain membrane electrode b3.The active area of membrane electrode is 25 centimetres
2
Comparative Examples 3
This Comparative Examples is used to illustrate the preparation method of existing membrane electrode of fuel batter with proton exchange film.
With carbon paper (toray TGP-H-060) as conductive substrates.Conductive substrates is placed on the vacuum absorbing platform of screen process press, with screen printing forme (40 purpose nylon wires, the thickness of screen printing forme is 25 microns) cover on the conductive substrates, conductive agent slurry (contain weight ratio be 1: 0.05: 4 carbon black, polytetrafluoroethylene and ethanol) is printed onto on the conductive substrates, and the thickness of one-step print is 6 microns.Every printing once utilizes infrared heating device after 120 ℃ of temperature are carried out drying, republishes for the second time, and be 54 microns up to the thickness of diffusion layer.350 ℃ of following sintering 30 minutes.
The conductive substrates of printed diffusion layer is placed on the vacuum absorbing platform of screen process press, screen printing forme (100 purpose nylon wires, the thickness of screen printing forme are 20 microns) is covered on the conductive substrates of printed diffusion layer.(solid content of this catalyst pulp is 4.7% with catalyst pulp, contain Pt/C catalyst, isopropyl alcohol and ethanol mixed solvent, Nafion solution, the weight ratio of isopropyl alcohol, ethanol and Nafion solution is 0.2: 0.2: 1, Nafion solution contains the Nafion resin of 5 weight %) be printed onto on the diffusion layer, the thickness of one-step print is 3.5 microns.Every printing once behind 100 ℃ of temperature dryings, republishes for the second time, is 15 microns up to the thickness of Catalytic Layer.
The conductive substrates of two above-mentioned printed diffusion layers that obtain and Catalytic Layer is cut into the square of 5 centimetres of 5 cm x, be attached to the nafion film (NRE212 of area symmetrically greater than conductive substrates, DUPONT company product) both sides, wherein, Catalytic Layer contacts with the nafion film, send into 130 ℃ of hot presses, 2 MPa hot pressing 2 minutes then, obtain membrane electrode a2.The active area of membrane electrode is 25 centimetres
2
Embodiment 5 and 6
Embodiment 5 and 6 is used for measuring respectively the performance of embodiment 3 and 4 membrane electrodes that prepare.
According to the method identical with embodiment 2, with battery separator embodiment 3 and 4 membrane electrode b2 and the b3 that prepare are assembled into fuel cell B2 and B3 respectively, fuel cell B2 and B3 are activated, and fuel cell B2 after the mensuration activation and output voltage and the power output of B3, the result is respectively as shown in Figure 3 and Figure 4.
Comparative Examples 4
This Comparative Examples is used to measure the performance of the membrane electrode of Comparative Examples 3 preparations.
According to the method identical with embodiment 2, with battery separator the membrane electrode a2 that Comparative Examples 3 prepares is assembled into fuel cell A2, A2 activates to fuel cell, and measures output voltage and the power output of the fuel cell A2 after the activation, and the result respectively as shown in Figure 3 and Figure 4.
In Fig. 3, b2 represents the current-voltage curve of fuel cell B2, and b3 represents the current-voltage curve of fuel cell B3, and a2 represents the current-voltage curve of fuel cell A2.As can be seen from Figure 3, under identical discharge current density condition, the discharge voltage of fuel cell B2 and B3 is all greater than the discharge voltage of fuel cell A2.
In Fig. 4, b2 represents electric current-power curve of fuel cell B2, and b3 represents electric current-power curve of fuel cell B3, and a2 represents electric current-power curve of fuel cell A2.As can be seen from Figure 4, under identical discharge current density condition, the power output of fuel cell B2 and B3 illustrates and adopts the inventive method can significantly improve the discharge performance of the membrane electrode that makes all greater than the power output of fuel cell A2.
Claims (9)
1. the preparation method of a membrane electrode of fuel batter with proton exchange film, this method comprises the preparation diffusion layer; Use catalyst pulp to prepare Catalytic Layer by silk screen print method; Catalytic Layer and diffusion layer and proton exchange membrane is laminated, make Catalytic Layer between diffusion layer and proton exchange membrane, it is characterized in that the solid content of catalyst pulp is 5-15%; Described use catalyst pulp comprises a plurality of printing stages by the process that silk screen print method prepares Catalytic Layer, and the print thickness of each printing stage is the 0.5-3 micron.
2. method according to claim 1, wherein, the solid content of described catalyst pulp is 7-13.5 weight %.
3. method according to claim 1, wherein, described catalyst pulp contains catalyst, Nafion solution and solvent, and the weight ratio of Nafion solution and solvent is 1: 0.02-5.
4. method according to claim 3, wherein, described catalyst is one or more in Pt/C catalyst, Pt-Ru/C catalyst, the Pt-Cr/C catalyst; Described solvent is one or more in water, isopropyl alcohol, ethanol, the glycerol; Described Nafion solution is 1 by weight ratio: Nafion resin, the rudimentary alcohol and water of 15-16: 3-4 are formed.
5. method according to claim 1 wherein, after each printing stage, makes the catalyst pulp drying of printing.
6. method according to claim 1, wherein, the preparation method of described diffusion layer comprises that using silk screen print method will contain the conductive agent slurry is coated on the conductive substrates, the conductive agent content of conductive agent slurry is 5-60 weight %.
7. method according to claim 6, wherein, described conductive agent slurry also contains binding agent and solvent, and the weight ratio of conductive agent and binding agent is 1: 0.02-5; Described conductive agent is one or more in activated carbon, acetylene black, the graphite carbon black; Described binding agent is one or more in polytetrafluoroethylene, hexafluoropropylene, the polyvinyl fluoride; Described solvent is one or more in water, isopropyl alcohol, ethanol and the glycerol.
8. method according to claim 6, wherein, described conductive substrates is a carbon paper.
9. method according to claim 1, wherein by hot pressing that Catalytic Layer, diffusion layer and proton exchange membrane is laminated, the condition of hot pressing comprises that the temperature of hot pressing is that 60-200 ℃, the pressure of hot pressing are that 0.1-10 MPa, hot pressing time are 1-10 minute.
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| CN105633421A (en) * | 2014-11-07 | 2016-06-01 | 中国科学院大连化学物理研究所 | Preparation method of low-platinum catalytic layer for proton exchange membrane fuel cell |
| CN110064411A (en) * | 2018-11-30 | 2019-07-30 | 中国科学院山西煤炭化学研究所 | A kind of catalyst and preparation method and the application of Asia titanium oxide and molybdenum sulfide water electrolysis hydrogen production |
| CN110112426A (en) * | 2019-04-29 | 2019-08-09 | 江苏天奇氢电装备有限公司 | Proton exchange membrane and preparation method thereof |
| US11705558B2 (en) | 2020-06-19 | 2023-07-18 | Robert Bosch Gmbh | Patterned catalyst layers in fuel cells |
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| CN1560949A (en) * | 2004-02-20 | 2005-01-05 | �人����ѧ | Catalyst coated membrane fuel cell by indirect method ultrathin core assembly for synthetising |
| CN1719653A (en) * | 2005-05-19 | 2006-01-11 | 武汉理工大学 | Process for preparing proton exchange film full cell chips with water retaining function |
Non-Patent Citations (1)
| Title |
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| CN 1560949 A,权利要求，实施例. |
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