CN102386428A - Method for reducing influences on performance and service life of fuel cell by open-circuit voltage and switching-on/off - Google Patents
Method for reducing influences on performance and service life of fuel cell by open-circuit voltage and switching-on/off Download PDFInfo
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- CN102386428A CN102386428A CN2011103798895A CN201110379889A CN102386428A CN 102386428 A CN102386428 A CN 102386428A CN 2011103798895 A CN2011103798895 A CN 2011103798895A CN 201110379889 A CN201110379889 A CN 201110379889A CN 102386428 A CN102386428 A CN 102386428A
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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 discloses a method for reducing influences on performance and service life of a fuel cell by open-circuit voltage and switching-on/off. The method comprises the following steps of: after switching off the fuel cell, closing a hydrogen gas outlet, an air inlet and an air outlet on an electric pile; and keeping that a hydrogen gas source is communicated with a fluid on a hydrogen gas inlet of the electric pile so that the hydrogen gas source can enter into the electric pile through the hydrogen gas inlet. According to the method provided by the invention, the influences on the performance and the service life of the fuel cell by the open-circuit voltage and the switching-on/off can be reduced and the problem of damaging electrodes by the open-circuit voltage and a hydrogen gas/air interface formed by switching on and switching off can be effectively solved.
Description
Technical field
The present invention relates to fuel cell, particularly a kind of method that reduces open circuit voltage and switching on and shutting down to fuel battery performance and effect on service life.What relate to is Chinese science and technology portion " 863 Program " " 5kW level fuel cell critical material and system integration technology exploitation " key project (bullets: 2009AA034400).
Background technology
In order to solve the exhausted day by day pressing issues of environmental pollution, greenhouse effect and fossil fuel; The development of fuel cell is all paid much attention in countries in the world; Because fuel cell is a kind of high-efficiency cleaning energy conversion device; Environment there is not or has only very little pollution, and can be with recyclability material such as hydrogen and methyl alcohol as fuel.A lot of countries especially developed country have dropped into lot of manpower and material resources and financial resources are researched and developed fuel cell.China as developing country has also strengthened the input to the fuel cell research and development.National and a lot of provinces and cities have risen to strategic height to development of fuel cells, and development of fuel cells as one of most important R&D direction.
Fuel cell is a kind of electrochemical energy energy converter, directly changes into electric energy to the chemical energy in fuel and the oxygen.Pile is one of core in the fuel cell system, and fuel is oxidized at the anode of pile, and oxygen (generally from air, obtaining) is reduced at the negative electrode of pile.As long as have fuel and oxygen ceaselessly to import, fuel cell just can continuously produce electric energy.When electrolyte was acid material, reaction equation (1) had been explained the oxidizing process of hydrogen at anode, and reaction equation (2) has been explained the reduction process of oxygen at negative electrode:
H
2＝2H
++2e
-(1)
O
2+4H
++4e
-＝2H
2O (2)
The nano particle of platinum (Pt) and platinoid generally as catalyst to quicken the carrying out of these reactions.
Be closed after operation of fuel cells finishes or be in holding state; Leave responseless fuel such as hydrogen in the anode cavities of pile; Leave responseless air in the cathode cavity of pile; Pile is in open-circuit condition, and the open circuit voltage of each monocell in the pile is all about 1V, shown in Fig. 1 a.After fuel cell system was closed, the import and export of hydrogen also were closed, and the import and export of air also are closed, thereby the pile and the external world are kept apart.The hydrogen and the air in the negative electrode that remain in the pile anode can slowly diffuse through electrolytic thin-membrane and interreaction production water, shown in reaction equation (3):
2H
2+O
2＝2H
2O (3)
H in the anode chamber
2With the O in the cathode chamber
2Because of reaction (3) reduces gradually, the gas pressure in two chambers can become less than atmospheric pressure, and the air in the external world will slowly be diffused in two chambers through various channels.At last, the airborne O that can be come from the outside of the hydrogen in the anode chamber
2Thoroughly consume, this chamber also is full of by air.Like this, two chambers all are full of by air at last.
The open circuit voltage of each monocell after two chambers all are full of by air in the pile all is in 0V, but the voltage between each electrode and the electrolyte is about 1V, and the phase boundary potential between electrode and the electrolyte is by reaction: 0.5O
2+ 2H
++ 2e
-=H
2The O decision, as shown in Figure 1.That is to say that after shutdown a period of time, anode and negative electrode/electrolytical phase boundary potential all is in the open circuit voltage about 1V.Like this, the catalyst in the electrode is bearing the open circuit voltage about 1V with its carrier such as carbon black always, quickens their oxidation and corrosion process, shortens the life-span of electrode.
In addition, than open circuit voltage harm bigger be when hydrogen and air during at anode formation hydrogen/air interface, as shown in Figure 2.This interface can form when outside air slowly diffuses into the anode that contains remaining hydrogen after shutdown, also can be when starting shooting when hydrogen gets into the anode that is occupied by air, forms next time.The hydrogen/air interface that dotted line representative among Fig. 2 forms when air enters the anode chamber that contains hydrogen, it has been divided into I to membrane electrode, II, III, four parts of IV.What exist at part I is hydrogen, and current potential is by reaction: H
2=2H
++ 2e
-Decision, so the voltage of electrode/electrolyte interface approximately is 0V; What exist at part II is oxygen, and current potential is by reaction: 0.5O
2+ 2H
++ 2e
-=H
2The O decision, so the voltage of electrode/electrolyte interface approximately is 1V; The state of anode and negative electrode was the same when the state of part I and II just was in open circuit with a fuel cell, and voltage difference between the two is 1V (1V-0V=1V).Because what exist at part III also is oxygen, and part III and part I also connect through symphysis, and part III and part II are similar, and current potential is by reaction: 0.5O
2+ 2H
++ 2e
-=H
2The O decision, so the voltage of electrode/electrolyte interface approximately is 1V.Because the voltage difference between whole negative electrode and the whole anode is about 1V, especially when air had just entered the anode chamber that contains hydrogen, like this, the voltage of part IV place electrode/electrolyte interface was just near 2V (1V+1V=2V).Under so high-tension effect, the electrode material of part IV will be by rapid damage, and key reaction comprises the destruction of catalyst carrier carbon: C+2H
2O=CO
2+ 4H
+4e
-And catalyst self is oxidized: Pt+xH
2O=PtO
x+ 2xH
++ 2xe
-The decomposition of water also can take place in addition: H
2O=0.5O
2+ 2H
++ 2e
-, but this instead would not destroy electrode material.In order to understand Fig. 2 better, suggestion is consulted: Hao Tang, Zhigang Qi; Manikandan Ramani; And John Elter, PEM fuel cell cathode carbon corrosion due to the formation of air/fuel boundary at the anode, Journal of Power Sources; 158,1306-1312 (2006).
Form the electrode/electrolyte interface voltage about 2V when the switching on and shutting down for fear of shown in Figure 2; Conventional method is to purge with inert gas such as nitrogen antianode and cathode chamber after shutdown and before the start; But this method need be in the use on-the-spot deposit nitrogen and the replacing at any time of fuel cell; Make troubles, and increase cost, the weight and volume of system.
Summary of the invention
To the deficiency that exists in the prior art; The object of the present invention is to provide a kind of method that reduces open circuit voltage and switching on and shutting down to fuel battery performance and effect on service life, the hydrogen/air interface that forms when solving open circuit voltage and open and close machine is to the destruction problem of electrode.
Technical scheme of the present invention is achieved in that in order to reduce open circuit voltage and the switching on and shutting down method to fuel battery performance and effect on service life; After the fuel cell shutdown, close hydrogen outlet, air intlet and the air outlet slit on the pile, but keep the hydrogen inlet fluid communication of sources of hydrogen and pile so that the hydrogen in the said sources of hydrogen can enter in the said pile through said hydrogen inlet.After shutdown a period of time, the hydrogen that oxygen in the cathode chamber can be come through membrane electrode diffusion from anode thoroughly consumes, and the gas in this chamber finally becomes the gaseous mixture of hydrogen and nitrogen, but is main with nitrogen; Equally; Air also can be from negative electrode through membrane electrode diffusion to anode, the diffusion oxygen of coming can be all with anode chamber in hydrogen reaction fall, but nitrogen can not participated in any reaction; Like this; Anode chamber also becomes the gaseous mixture of hydrogen and nitrogen at last, but the overwhelming majority is a hydrogen, and whole process is as shown in Figure 3.H among Fig. 3 in dashed rectangle
2Or O
2/ N
2The gas that representative is come from the chamber opposite diffusion.Like this, because the reaction gas in each chamber finally all is that hydrogen is (with inert gas N
2), anode interface and negative electrode/electrolytical phase boundary potential is 0V all just, by reaction: H
2=2H
++ 2e
-Decision, as shown in Figure 4; Thereby the electrode/electrolyte interface voltage about the 1V that has been occurred after having avoided routine as shown in Figure 1 to shut down is to the destruction of electrode.When starting shooting next time, air is transported in the cathode chamber, can form the hydrogen/oxygen interface with the hydrogen that exists in this chamber, and is as shown in Figure 5; But owing to the initial action gas in two chambers all is hydrogen, even the formation at this interface has been lifted to 1V to the voltage instantaneous of the electrode/electrolyte interface of part I, this also only is normal open circuit voltage; As shown in Figure 2ly do not form electrode/electrolyte interface voltage and do not resemble, thereby avoided high electrode/electrolyte interface voltage as shown in Figure 2 destruction electrode near 2V at part IV.
The above-mentioned method that reduces open circuit voltage and switching on and shutting down to fuel battery performance and effect on service life, sources of hydrogen place hydrogen outlet absolute pressure is more than or equal to 1.01 atmospheric pressure, smaller or equal to 5 atmospheric pressure.
The above-mentioned method that reduces open circuit voltage and switching on and shutting down to fuel battery performance and effect on service life, absolute pressure when sources of hydrogen place hydrogen outlet absolute pressure is arranged on greater than operation of fuel cells within back 30 minutes of shutting down.Under higher Hydrogen Vapor Pressure; Hydrogen can reach negative electrode through membrane electrode with fast speeds; Like this; Can fall remaining oxygen full consumption in the pile negative electrode at short notice, thereby reduce the time that pile is in open circuit voltage conditions, avoid the destruction of postboost open circuit voltage effectively electrode.
The above-mentioned method that reduces open circuit voltage and switching on and shutting down to fuel battery performance and effect on service life, shutting down, sources of hydrogen place hydrogen outlet absolute pressure is arranged on smaller or equal to 5 atmospheric pressure in back 30 minutes.Sources of hydrogen place hydrogen outlet absolute pressure excessive (greater than 5 atmospheric pressure) can't be brought tangible good effect, may make the hydrogen gas leakage that gets in the pile on the contrary in environment, causes the waste of hydrogen and potential potential safety hazard; Simultaneously, pressure reduction is crossed and may well be caused the membrane electrode damage between anode/cathode.
The above-mentioned method that reduces open circuit voltage and switching on and shutting down to fuel battery performance and effect on service life is shut down and is transferred to sources of hydrogen place hydrogen outlet absolute pressure more than or equal to 1.01 atmospheric pressure, smaller or equal to 2 atmospheric pressure after 30 minutes.Generally speaking, the oxygen in the pile negative electrode after 30 minutes of shutting down is consumed fully, has been in state as shown in Figure 4 in the pile, as long as keep sources of hydrogen place hydrogen outlet absolute pressure greater than 1 atmospheric pressure.
The above-mentioned method that reduces open circuit voltage and switching on and shutting down to fuel battery performance and effect on service life, shutting down was adjusted to 1.01 atmospheric pressure to sources of hydrogen place hydrogen outlet absolute pressure after 30 minutes.
The above-mentioned method that reduces open circuit voltage and switching on and shutting down to fuel battery performance and effect on service life; After oxygen in the pile cathode chamber is consumed fully; The anode chamber air pressure of pile equates with pile cathode chamber air pressure, and when equating with sources of hydrogen place hydrogen outlet absolute pressure, closes sources of hydrogen; When the anode chamber absolute pressure of pile during, open sources of hydrogen less than 1.005 atmospheric pressure; Like this can be under the situation of practicing thrift hydrogen as much as possible; Remain the hydrogen that capacity is arranged in anode chamber and the cathode chamber of pile; Avoid outside air to enter in the pile (that is: keeping pile to be in state shown in Figure 4), avoid pile to be in state illustrated in figures 1 and 2 and electrode is damaged.
The above-mentioned method that reduces open circuit voltage and switching on and shutting down to fuel battery performance and effect on service life is installed gas pressure sensor in the anode chamber of pile and cathode chamber.So just can accurately obtain gas pressure in anode chamber and the cathode chamber of pile at any time, be convenient in time to prevent effectively that through sources of hydrogen hydrogen supply in pile surrounding air from getting in the pile.
The above-mentioned method that reduces open circuit voltage and switching on and shutting down to fuel battery performance and effect on service life, the absolute pressure measuring range of said gas pressure sensor is at 0 to 5 atmospheric pressure.
The above-mentioned method that reduces open circuit voltage and switching on and shutting down to fuel battery performance and effect on service life is regulated sources of hydrogen place hydrogen outlet absolute pressure and is made air pressure in the anode chamber of pile all the time greater than 1 atmospheric pressure.Because the air pressure in the anode chamber is higher than environment atmospheric pressure, the air of outside is difficult to diffuse into the anode chamber and the cathode chamber of pile; Even still have little air to diffuse into the anode chamber and the cathode chamber of pile, its speed also can be very slow, also can in time be reacted away by the hydrogen in the anode chamber of pile and the cathode chamber simultaneously.
The above-mentioned method that reduces open circuit voltage and switching on and shutting down to fuel battery performance and effect on service life; Absolute pressure when sources of hydrogen place hydrogen outlet absolute pressure is with operation of fuel cells after the shutdown equates; Promptly sources of hydrogen place hydrogen outlet absolute pressure is not regulated; Simplify control program, reduce controlled step, but can some hydrogen of many losses.
The present invention is as Chinese science and technology portion " 863 Program " " 5kW level fuel cell critical material and system integration technology exploitation " key project (bullets: 2009AA034400) one of research and development achievement; For improving the improvement that fuel battery performance and life-span carry out; The invention has the beneficial effects as follows: reduce open circuit voltage and switching on and shutting down to fuel battery performance and effect on service life, and the hydrogen/air interface that forms can solve open circuit voltage and open and close machine effectively the time is to the destruction problem of electrode.
Description of drawings
Fig. 1 a is an open circuit voltage situation sketch map after fuel cell has just shut down;
Fig. 1 is a voltage situation sketch map after fuel cell shutdown a period of time in the prior art;
Fig. 2 is that anode of fuel cell forms H in the prior art
2/ O
2Voltage situation sketch map during the interface;
Negative electrode and anode cavities indoor gas change procedure sketch map when Fig. 3 reduces open circuit voltage and switching on and shutting down to the method for fuel battery performance and effect on service life for using the present invention;
Fig. 4 voltage situation sketch map after a period of time that shuts down when using the present invention to reduce open circuit voltage and switching on and shutting down to the method for fuel battery performance and effect on service life;
Fig. 5 for use the present invention reduce open circuit voltage and switching on and shutting down to the method for fuel battery performance and effect on service life after negative electrode formation H
2/ O
2Voltage situation sketch map during the interface.
Among the figure: 1-anode, 2-negative electrode, 3-electrolyte, 4-starting stage, 5-interstage, 6-final stage, 7-sources of hydrogen.
Embodiment
In conjunction with the accompanying drawings the present invention is made further description:
Present embodiment reduces open circuit voltage and the switching on and shutting down method to fuel battery performance and effect on service life; After the fuel cell shutdown, close hydrogen outlet, air intlet and the air outlet slit on the pile, but keep the hydrogen inlet fluid communication of sources of hydrogen and pile so that the hydrogen in the said sources of hydrogen can enter in the said pile through said hydrogen inlet.Shut down when being arranged on sources of hydrogen place hydrogen outlet absolute pressure greater than operation of fuel cells in back 30 minutes pressure but smaller or equal to 5 atmospheric pressure, so that hydrogen can comparatively fast consume the oxygen in the cathode chamber through membrane electrode under the effect of pressure reduction as early as possible.Shut down and be transferred to sources of hydrogen place hydrogen outlet absolute pressure more than or equal to 1.01 atmospheric pressure, smaller or equal to 2 atmospheric pressure after 30 minutes; Such as being adjusted to 1.01 atmospheric pressure to sources of hydrogen place hydrogen outlet absolute pressure, can avoid membrane electrode to bear High Pressure Difference for a long time and cause damage.After oxygen in the cathode chamber of pile was consumed fully, the anode chamber air pressure of pile equated with cathode chamber air pressure, and when equating with sources of hydrogen place hydrogen outlet absolute pressure, closed sources of hydrogen; When the anode chamber absolute pressure of pile during, open sources of hydrogen less than 1.005 atmospheric pressure; Like this can be under the situation of practicing thrift hydrogen as much as possible, remain the hydrogen that capacity is arranged in anode chamber and the cathode chamber of pile, avoid outside air to enter in the pile.In the anode chamber of pile and cathode chamber, gas pressure sensor is installed,,, is prevented that effectively surrounding air from getting in the pile in time through sources of hydrogen hydrogen supply in pile so that accurately obtain gas pressure in anode chamber and the cathode chamber of pile at any time.
The difference of present embodiment and embodiment 1 is: the absolute pressure when sources of hydrogen place, shutdown back hydrogen outlet absolute pressure remains on operation of fuel cells.After the fuel cell shutdown, close hydrogen outlet, air intlet and the air outlet slit on the pile; But the hydrogen inlet fluid communication that keeps sources of hydrogen and pile be so that the hydrogen in the said sources of hydrogen can enter in the said pile through said hydrogen inlet, and do not adjust the absolute pressure of sources of hydrogen place hydrogen outlet.Such as sources of hydrogen place hydrogen outlet absolute pressure is arranged on 1.5 atmospheric pressure during operation of fuel cells, and sources of hydrogen place, shutdown back hydrogen outlet absolute pressure still is arranged on 1.5 atmospheric pressure, does not promptly regulate the hydrogen outlet absolute pressure setting of sources of hydrogen place.So just omitted among the embodiment 1 regulating step of shutdown back, also needn't in the anode chamber of pile and cathode chamber, gas pressure sensor be installed, but understand some hydrogen of many losses sources of hydrogen place hydrogen outlet absolute pressure.
In the foregoing description 1 and embodiment 2; Owing to be to the pile supply of hydrogen in fuel cell shutdown continued; But close hydrogen outlet, air intlet and air outlet slit on the pile, like this, sources of hydrogen is in open mode; Hydrogen inlet is in opening state, and hydrogen can freely get into pile through pressure reduction.Shut down early stage, fuel cell is in and conventional the same open-circuit condition, and open circuit voltage is 1V, and hydrogen and oxygen can diffuse through film and interreaction: H
2+ O
2=H
2O.In order to quicken the diffusion velocity of hydrogen, also can suitably increase the pressure of sources of hydrogen hydrogen outlet to cathode chamber.Finally, the oxygen in the cathode chamber can thoroughly be consumed, and the gas in this chamber finally becomes the gaseous mixture of hydrogen and nitrogen, but is main with nitrogen, and anode chamber also becomes the gaseous mixture of hydrogen and nitrogen, but the overwhelming majority is a hydrogen, and whole process is as shown in Figure 3.H among Fig. 3 in dashed rectangle
2Or O
2/ N
2The gas that representative is come from the chamber opposite diffusion.Like this, because the reaction gas in each chamber finally all is that hydrogen is (with inert gas N
2), anode interface and negative electrode/electrolytical phase boundary potential is 0V all just, by reaction: H
2=2H
++ 2e
-Decision, as shown in Figure 4, thus the electrode/electrolyte interface voltage about the 1V that has avoided being occurred after the conventional shutdown is to the destruction (as shown in Figure 1) of electrode.
When starting shooting next time, air is transported in the cathode chamber, can form the hydrogen/oxygen interface with the hydrogen that has existed, and is as shown in Figure 5.But owing to the initial action gas in two chambers all is hydrogen; Even the formation at this interface has been lifted to 1V to the voltage instantaneous of the electrode/electrolyte interface of part I; This also only is normal open circuit voltage; As shown in Figure 2ly do not form electrode/electrolyte interface voltage and do not resemble, thereby avoided high electrode/electrolyte interface voltage as shown in Figure 2 destruction electrode near 2V at part IV.
The destruction of the present invention through when fuel cell shutdown continued (continuously or by phased manner) reduces fuel cell electrode in shutdown, standby and start greatly to the method for pile supply of hydrogen, being suffered.
In addition, in the process of pile supply of hydrogen, preferred scheme is to remain sources of hydrogen place hydrogen outlet absolute pressure greater than the gas pressure in the anode chamber, so as sources of hydrogen smoothly, fast to the pile supply of hydrogen.In the process that oxygen in cathode chamber and the hydrogen in the anode chamber are consumed because the relation of pressure reduction, sources of hydrogen can be correspondingly hydrogen make-up in the anode chamber automatically; So when sources of hydrogen place hydrogen outlet absolute pressure during greater than 1 atmospheric pressure, the air pressure in the anode chamber remains at an atmospheric pressure or a little more than an atmospheric pressure.The pressure of cathode chamber can have one a little less than an atmospheric process in the process of oxygen expenditure; But after all oxygen all is consumed; Because hydrogen still spreads to cathode chamber; The air pressure of cathode chamber is because the increase of amounts of hydrogen and raising gradually, reaches consistent up to its air pressure with air pressure in the anode chamber, all is the hydrogen outlet pressure of sources of hydrogen.Because sources of hydrogen place hydrogen outlet absolute pressure is greater than 1 atmospheric pressure (being higher than environment atmospheric pressure), the air of outside is difficult to diffuse into the anode chamber and the cathode chamber of pile; Even still have little air to diffuse into pile, its speed also can be very slow, can be reacted away in time by the hydrogen in the chamber simultaneously.
Claims (10)
1. reduce open circuit voltage and switching on and shutting down method to fuel battery performance and effect on service life; It is characterized in that; After the fuel cell shutdown, close hydrogen outlet, air intlet and the air outlet slit on the pile, but keep the hydrogen inlet fluid communication of sources of hydrogen and pile so that the hydrogen in the said sources of hydrogen can enter in the said pile through said hydrogen inlet.
2. according to claim 1ly reduce open circuit voltage and switching on and shutting down, it is characterized in that sources of hydrogen place hydrogen outlet absolute pressure is more than or equal to 1.01 atmospheric pressure, smaller or equal to 5 atmospheric pressure the method for fuel battery performance and effect on service life.
3. according to claim 2ly reduce open circuit voltage and switching on and shutting down, it is characterized in that, absolute pressure when sources of hydrogen place hydrogen outlet absolute pressure is arranged on greater than operation of fuel cells in back 30 minutes of shutting down the method for fuel battery performance and effect on service life.
4. according to claim 2ly reduce open circuit voltage and switching on and shutting down to the method for fuel battery performance and effect on service life, it is characterized in that, shutting down, sources of hydrogen place hydrogen outlet absolute pressure is arranged on smaller or equal to 5 atmospheric pressure in back 30 minutes.
5. the method that reduces open circuit voltage and switching on and shutting down to fuel battery performance and effect on service life according to claim 2; It is characterized in that, shut down and be transferred to sources of hydrogen place hydrogen outlet absolute pressure more than or equal to 1.01 atmospheric pressure, smaller or equal to 2 atmospheric pressure after 30 minutes.
6. according to claim 5ly reduce open circuit voltage and switching on and shutting down, it is characterized in that, shut down and be adjusted to 1.01 atmospheric pressure to sources of hydrogen place hydrogen outlet absolute pressure after 30 minutes the method for fuel battery performance and effect on service life.
7. according to the arbitrary described method that reduces open circuit voltage and switching on and shutting down to fuel battery performance and effect on service life of claim 1-6; It is characterized in that; After the oxygen in the pile cathode chamber is consumed fully; When the anode chamber air pressure of pile equates with sources of hydrogen place hydrogen outlet absolute pressure, close sources of hydrogen; When the anode chamber absolute pressure of pile during, open sources of hydrogen less than 1.005 atmospheric pressure.
8. describedly reduce open circuit voltage and switching on and shutting down according to claim 1-7 is arbitrary, it is characterized in that, in the anode chamber of pile and cathode chamber, gas pressure sensor is installed the method for fuel battery performance and effect on service life.
9. the method that reduces open circuit voltage and switching on and shutting down to fuel battery performance and effect on service life according to claim 1; It is characterized in that, regulate sources of hydrogen place hydrogen outlet absolute pressure and make absolute pressure in the anode chamber of pile all the time greater than 1 atmospheric pressure.
10. according to claim 1ly reduce open circuit voltage and switching on and shutting down to the method for fuel battery performance and effect on service life, it is characterized in that, the absolute pressure of sources of hydrogen place, shutdown back hydrogen outlet absolute pressure during with operation of fuel cells equates.
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| CN111224132A (en) * | 2020-01-09 | 2020-06-02 | 郑州宇通客车股份有限公司 | Shutdown purging method and system for fuel cell |
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| CN103647092A (en) * | 2013-10-30 | 2014-03-19 | 张勇 | Method and device for prolonging fuel cell service life |
| WO2015062154A1 (en) * | 2013-10-30 | 2015-05-07 | Yong Zhang | Method and device for enhancing fuel cell lifetime |
| CN103647092B (en) * | 2013-10-30 | 2016-02-03 | 张勇 | Extend the method and apparatus of fuel battery service life |
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| CN111224132B (en) * | 2020-01-09 | 2021-05-04 | 郑州宇通客车股份有限公司 | Shutdown purging method and system for fuel cell |
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Application publication date: 20120321 |