CN104316586A - Fuel concentration measuring method - Google Patents
Fuel concentration measuring method Download PDFInfo
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- CN104316586A CN104316586A CN201410538155.0A CN201410538155A CN104316586A CN 104316586 A CN104316586 A CN 104316586A CN 201410538155 A CN201410538155 A CN 201410538155A CN 104316586 A CN104316586 A CN 104316586A
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Abstract
The invention provides a fuel concentration measuring method. The fuel concentration measuring method comprises the following steps: firstly, providing an individual fuel cell which is provided with an anode side and a cathode side; secondly, supplying a fuel to the anode side and supplying a reactant gas to the cathode side; and finally, adjusting the amount of the reactant gas supplied to the cathode side and determining the concentration of the fuel according to the consumption rate of the reactant gas in the individual fuel cell.
Description
The divisional application that the application is the applying date is on Dec 1st, 2008, application number is 200810177816.6, denomination of invention is the application for a patent for invention of " fuel concentration measuring method ".
Technical field
The present invention relates to a kind of fuel concentration measuring method, and in particular to a kind of simple and fuel concentration measuring method that degree of accuracy is high.
Background technology
Along with the progress of industry, traditional energy such as the consumption of coal, petroleum and natural gas continues to raise, because the storage of natural energy source is limited, therefore must research and develop new substitute energy to replace traditional energy, and fuel cell is a kind of important and selection had practical value.
In simple terms, fuel cell is a kind ofly utilize the reversed reaction of water electrolysis and chemical energy converted to the Blast Furnace Top Gas Recovery Turbine Unit (TRT) of electric energy substantially.With Proton Exchange Membrane Fuel Cells, it is mainly made up of a membrane electrode group (membrane electrode assembly is called for short MEA) and two battery lead plates.Membrane electrode group is made up of a proton-conductive films (proton exchange membrane), an anode catalyst layer, a cathode catalyst layer, an anode gas diffusion layer (gas diffusion layer, GDL) and a cathode gas diffusion layer.Wherein, above-mentioned anode catalyst layer and cathode catalyst layer are configured at the both sides of proton-conductive films respectively, and anode gas diffusion layer and cathode gas diffusion layer are separately positioned on anode catalyst layer and cathode catalyst layer.In addition, two battery lead plates comprise an anode and a negative electrode, and it is configured on anode gas diffusion layer and cathode gas diffusion layer respectively.
The common Proton Exchange Membrane Fuel Cells of current industry is DMFC (Direct Methanol Fuel Cell, be called for short DMFC), it directly uses methanol aqueous solution to be used as fuel supply source, and react via the related electrode of methyl alcohol and oxygen and carry out generation current.The reaction equation of DMFC is as follows:
Anode: CH
3oH+H
2o → CO
2+ 6H
++ 6e
-
Negative electrode: 3/2O
2+ 6H
++ 6e
-→ 3H
2o
During reaction, the concentration importing the methanol solution of anode can cause very large impact to the output stability of DMFC.If it is improper that the concentration importing the methanol solution of anode controls, except causing the shortcomings such as generating efficiency is not good, output power is unstable, more easily cause the damage of membrane electrode group.Therefore, how suitable supplementary methyl alcohol, enable the concentration of the methanol solution of importing anode be controlled in most suitable scope, is current DMFC one of considerable problem in research and development.
The most direct mode of fuel concentration controlled in fuel cell is exactly the concentration utilizing sensor directly to measure fuel, and decides the magnitude of recruitment of fuel and water according to the result measured.This kind of practice is in US 6, open in the document such as 589,671 B1, US 6,488,837, US 2002/076589A1, US 2003/0196913A1, WO 01/35478.Wherein, US 6,488,837 and US 2003/0196913A1 disclose using membrane electrode group as sensor, directly to measure the concentration of methyl alcohol.It should be noted that the degree of accuracy of said method is easily subject to the factor impacts such as impurity in fuel, membrane electrode group are aging or unstable.
Also have known technology by the temperature that measures and current value bring in experimental formula to extrapolate fuel concentration, as US 6,698,278 B2, this kind of practice does not need to use sensor and directly measures fuel concentration, but must adjust according to different fuel electrode systems, possible fuel concentration can be extrapolated.Other do not need to use sensor and directly measure the mode of fuel concentration as described in US 6,589,679, TW 94119975.
In addition, because the concentration of methanol solution and its physical characteristics specific inductive capacity or density etc. as the transmission speed of sound in methanol solution and fuel have specific relation, therefore there are many known technologies to utilize and measure the transmission speed of sound in methanol solution to extrapolate the concentration of methanol solution, or measure specific inductive capacity or density calculates that concentration is as TWI 251954.But this kind of concentration calculates that the sensor cost that mode uses is very expensive, or precision is serious by the aeration in fuel, when therefore measuring, the liquid of sensor inside must static and bubble-free, and the difficulty of measurement is quite high.
Take a broad view of above-mentioned concentration method for measurement, generally have measurement not easily, measure cost high, measure the problems such as degree of accuracy is unstable.Therefore, current industry needs a kind of simple and fuel concentration measuring method that degree of accuracy is high badly.
Summary of the invention
In view of this, the invention provides a kind of simple, method that cost is low and stable, accurately can record fuel concentration.
The present invention proposes a kind of fuel concentration measuring method, and it comprises provides a fuel cell, and this fuel cell has an anode-side, a cathode side and at least one membrane electrode assembly.Then, a fuel is supplied to anode-side, and a reacting gas is supplied to cathode side.Afterwards, adjustment is supplied to the amount of reactant gases of cathode side, and judges the concentration of fuel according to the wear rate of cathode side reaction gases.
For above and other object of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and coordinate accompanying drawing, be described in detail below.
Accompanying drawing explanation
Figure 1A and Figure 1B is the schematic diagram of the fuel concentration measuring method of first embodiment of the invention.
Fig. 2 is the fuel cell open-circuit voltage exported and the time curve stopping supplying reacting gas.
Fig. 3 is in different fuel concentration situations, and the open-circuit voltage that fuel cell exports supplies the time curve of reacting gas with stopping.
Fig. 4 A and Fig. 4 B is the schematic diagram of the fuel concentration measuring method of second embodiment of the invention.
Fig. 5 is in different fuel concentration situations, and fuel cell exports electric energy to determine voltage, and its electric current supplies the time chart of reacting gas with stopping.
Fig. 6 is in different fuel concentration situations, and fuel cell exports electric energy to determine electric current, and its voltage supplies the time chart of reacting gas with stopping.
Fig. 7 is the schematic diagram of the fuel concentration measuring method of third embodiment of the invention.
[main element symbol description]
100,200,300,400,500: fuel cell
110: anode-side
120: cathode side
130: membrane electrode group
131: proton-conductive films
132: anode catalyst layer
133: cathode catalyst layer
134: anode gas diffusion layer
135: cathode gas diffusion layer
140: fuel
150: reacting gas
160: penetrate fuel
170: extraneous load
180: sensor
OCV: open-circuit voltage
Embodiment
Figure 1A and Figure 1B is the schematic diagram of the fuel concentration measuring method of first embodiment of the invention.Please also refer to Figure 1A, first, provide a fuel cell 100, this fuel cell 100 has anode-side 110 and a cathode side 120.In the present embodiment, fuel cell 100 can be a DMFC monomer, specifically, fuel cell 100 has a membrane electrode group 130 between anode-side 110 and cathode side 120, wherein membrane electrode assembly 130 is such as be made up of a proton-conductive films 131 (proton exchange membrane), anode catalyst layer 132, cathode catalyst layer 133, anode gas diffusion layer 134 (gas diffusion layer, GDL) and a cathode gas diffusion layer 135.Above-mentioned anode catalyst layer 132 and cathode catalyst layer 133 are configured at the both sides of proton-conductive films 131 respectively, and anode gas diffusion layer 134 and cathode gas diffusion layer 135 are separately positioned on anode catalyst layer 132 and cathode catalyst layer 133.Certainly, the fuel cell 100 that the present embodiment adopts can be the fuel cell of any type, and those skilled in the art can select its optimal fuel cell according to actual demand.It should be noted that aforesaid fuel cell 100 can fuel cell pack in fuel cell system.
Then a fuel 140 is supplied to the anode-side 110 of fuel cell 100, and a reacting gas 150 is supplied to the cathode side 120 of fuel cell 100.In the present embodiment, the fuel 140 being supplied to anode-side 110 is such as the uncertain methanol solution of a concentration.Certainly, the fuel 140 being supplied to anode-side 110 can also be other kind of fuel, such as ethanolic solution, formic acid solution etc., and those skilled in the art can select suitable fuel according to actual demand.In addition, the reacting gas 150 being supplied to cathode side 120 is such as air, oxygen or other suitable gas.When fuel 140 is provided to fuel cell 100 constantly with reacting gas 150, anode-side 110 part of fuel can via penetrate (Crossover) phenomenon and arrive membrane electrode assembly 130 cathode catalyst layer 133 (as in Figure 1A indicate penetrate fuel 160), and carry out combustion reaction with oxygen, its reaction equation is as follows:
3/2O
2+CH
3OH→CO
2+2H
2O
Above-mentioned combustion reaction can consume the oxygen of cathode side 120, and now fuel cell 100 can maintain suitable open-circuit voltage (Open Circuit Voltage) OCV.
Then please refer to Figure 1B, the present embodiment can utilize the mode controlling gas transmission element or controlled valve (not indicating in figure), reduces or stops reacting gas 150 to be supplied to cathode side 120.Because fuel 140 concentration penetrating fuel 160 amount number and anode-side 110 arriving cathode side 120 has the relation of direct ratio, therefore arrive the direct wear rate that affect cathode side 120 reacting gas 150 of fuel 160 amount that penetrates number meeting of cathode side 120 via penetration phenomenon.Specifically, when supply on restriction is to reacting gas 150 amount of cathode side 120, consume gradually because the reacting gas 150 in cathode side 120 can carry out combustion reaction with penetrating fuel 160, the speed that therefore reacting gas 150 consumes can judge from the open-circuit voltage of fuel cell 100.In the present embodiment, when the reacting gas 150 being supplied to cathode side 120 is truncated, reacting gas 150 in cathode side 120 only enough allows the open-circuit voltage OCV of fuel cell 100 maintain a period of time, and the concentration of the length of this period and fuel 140 has close association.Specifically, if the concentration of fuel 140 is higher, it is just better to the ability of cathode side 120 that it penetrates (crossover) from anode-side 110, and now, the wear rate of reacting gas 150 is just faster; Otherwise if the concentration of fuel 140 is lower, its ability penetrating into cathode side 120 from anode-side 110 is just poorer, and now, the wear rate of reacting gas 150 is just slower.
Accept above-mentioned, because the concentration of fuel 140 is relevant to the wear rate of reacting gas 150, therefore the present invention according to the wear rate of reacting gas 150, can promptly extrapolate the concentration of fuel 140.
Fig. 2 is the open-circuit voltage OCV of fuel cell 100 and the time curve stopping supplying reacting gas 150, and Fig. 3 is in different fuel concentration situations, the time curve of reacting gas 150 is supplied in open-circuit voltage OCV and the stopping of fuel cell 100.The present embodiment can according to the open-circuit voltage OCV that measures carry out the consumption situation of response estimator gas 150, specifically, when reacting gas 150 is consumed totally, can be there is situation about declining in open-circuit voltage OCV, the time point that this open-circuit voltage OCV occurs to decline can be used to the concentration calculating fuel 140.
Can know from Fig. 3 and learn, when the concentration of used methanol solution is respectively 1%, 3%, 5%, 7% and 9%, the time point that open-circuit voltage OCV occurs to decline has obvious difference.In other words, the time point that the present embodiment can utilize open-circuit voltage OCV to occur to decline is to extrapolate fuel concentration, and this mode has pretty good measurement sensitivity (sensitivity).
In the above-described embodiments, the time point mainly occurring to decline with open-circuit voltage extrapolates fuel concentration, but the present invention does not limit and must calculate fuel concentration in this way, and the speed that the present invention also can decline according to open-circuit voltage extrapolates fuel concentration.In addition, the present embodiment can also extrapolate the concentration of fuel according to the open-circuit voltage OCV time dropped to needed for particular value.For Fig. 3, when the concentration of methanol solution is higher, the time that open-circuit voltage OCV drops to particular value is shorter; Otherwise when the concentration of methanol solution is lower, the time that open-circuit voltage OCV drops to particular value is longer.It should be noted that the present embodiment can by controlling the amount of reactant gases that pass into, make corresponding to the fuel concentration of variable concentrations to the open-circuit voltage OCV time difference that drops to particular value widen, and then make the judgement of fuel concentration more easy.
It should be noted that, the fuel cell 100 that above-described embodiment is addressed can directly be used for being used as fuel concentration sensor, can also be connected in the fuel recirculation loop in fuel cell system, this kind of fuel concentration sensor does not need tap installing, and fuel concentration sensor does not operationally affect the running of fuel cell system.Specifically, because the present invention adopts fuel cell 100 to carry out the measurement of fuel concentration, therefore in fuel cell pack or multiple fuel cell can be used as fuel concentration sensor to use, to carry out the measurement of fuel concentration by the present invention.Now, fuel cell pack does not just need other fuel concentration sensor external.
Fig. 4 A and Fig. 4 B for according to the second embodiment of the present invention illustrate the schematic diagram of fuel concentration measuring method.Please also refer to Fig. 4 A, the fuel cell 400 of the present embodiment and the fuel cell 100 of the first embodiment similar, only the Main Differences of the two is: in Figure 4 A, and fuel cell 400 just to external world load 170 exports electric energy.
Then please refer to Fig. 4 B, fuel cell 400 can utilize the mode controlling gas transmission element or controlled valve (not indicating in figure), reduce or stop reacting gas 150 to be supplied to cathode side 120, when supply on restriction is to reacting gas 150 amount of cathode side 120, reacting gas 150 in cathode side 120 except fuel cell 400 reduction reaction and except being consumed, with penetrate combustion reaction that fuel 160 carries out and also can consume reacting gas 150 in cathode side 120, because the number penetrating fuel 160 amount is proportional to fuel 140 concentration of anode-side 110, the speed that therefore can consume from this reacting gas 150 calculates the concentration of fuel 140.
Fig. 5 is in different fuel concentration situations, and fuel cell exports electric energy to determine voltage, and its electric current supplies the time chart of reacting gas with stopping.Fig. 6 is in different fuel concentration situations, and fuel cell exports electric energy to determine electric current, and its voltage supplies the time chart of reacting gas with stopping.Can know from Fig. 5 and Fig. 6 and learn, the speed of change in voltage or curent change can promptly make measurement person extrapolate the concentration of fuel 140.
Continue referring to Fig. 5, according to each bar current versus time curve in Fig. 5, the time that measurement person can drop to needed for particular value according to electric current extrapolates fuel concentration.Specifically, when fuel concentration is higher, it is shorter that electric current drops to particular value required time; Otherwise when fuel concentration is lower, it is longer that electric current drops to particular value required time.In other embodiments, measurement person can also extrapolate fuel concentration according to the electric current slippage in special time.Specifically, when fuel concentration is higher, the electric current slippage in special time is larger; Otherwise when fuel concentration is lower, the electric current in special time declines less.
Please refer to Fig. 6, according to each bar voltage-time curve of Fig. 6, measurement person can extrapolate fuel concentration the time needed for voltage drop to particular value.Specifically, when fuel concentration is higher, voltage drop is shorter to particular value required time; Otherwise when fuel concentration is lower, voltage drop is longer to particular value required time.In other embodiments, measurement person can also extrapolate fuel concentration according to the falling quantity of voltages in special time.Specifically, when fuel concentration is higher, the falling quantity of voltages in special time is larger; Otherwise when fuel concentration is lower, the voltage drop in special time is less.
Accepting above-mentioned, in the method for measurement that Fig. 5 and Fig. 6 introduces, can, by controlling the amount of reactant gases passed into, making the judgement of fuel concentration more easy equally.
Fig. 7 is the schematic diagram of the fuel concentration measuring method of third embodiment of the invention.Please refer to Fig. 7, the fuel cell 500 of the present embodiment and the fuel cell 100 of the first embodiment similar, only the Main Differences of the two is: in the figure 7, and fuel cell 500 comprises a sensor 180 further.Specifically, the present embodiment first can measure reacting gas 150 concentration of this cathode side 120 by sensor 180.Then, then according to the concentration of reacting gas 150 that measures and the relation of time judge the concentration of fuel 140.In the present embodiment, sensor 180 is such as oxygen concentration sensor or pressure gauge.
Accept above-mentioned, if the present embodiment directly measures the concentration change of reacting gas 150 by sensor 180, the reckoning for the concentration of fuel 140 will be more convenient and accurate.
Similar with previous embodiment, the present embodiment can according to the concentration of reacting gas 150 drop to a certain particular value must time judge the concentration of fuel 140, or judge the concentration of fuel 140 according to the speed that reacting gas 150 concentration declines.
Obviously, in the 3rd above-mentioned embodiment, described sensor 180 can also be gas concentration lwevel sensor, because the speed of reactant consumption is proportional to the speed that product carbon dioxide produces, so the present embodiment also can use the speed that carbon dioxide sensor measures gas concentration lwevel rising instead, or measurement gas concentration lwevel rises to the time needed for a certain particular value, judges the concentration of fuel 140.
In sum, because the present invention can judge the concentration of fuel according to the reacting gas wear rate of cathode side, fuel concentration measuring method therefore proposed by the invention is very simple and accurate.In addition, fuel concentration measuring method of the present invention has quite high stability, is not vulnerable to flow in fuel and moves and the impact of bubble in fuel.
Although the present invention with preferred embodiment openly as above; so itself and be not used to limit the present invention, those skilled in the art, without departing from the spirit and scope of the present invention; when doing a little change and retouching, therefore protection scope of the present invention is when being as the criterion depending on the appended claims person of defining.
Claims (33)
1. a fuel concentration measuring method, comprising:
There is provided a fuel cell, this fuel cell has an anode-side, a cathode side and at least one membrane electrode assembly;
Corresponding to the fuel of at least one concentration known, set up the relation curve of at least one reacting gas concentration and time, and the method setting up the relation curve of at least one reacting gas concentration and time comprises:
A the fuel of one concentration known is supplied to this anode-side by ();
B one reacting gas is supplied to this cathode side by ();
(c) stop for should reacting gas to this cathode side, and measure the concentration of this this reacting gas of cathode side, to obtain the relation curve of a reacting gas concentration and time;
A the fuel of one unknown concentration is supplied to this anode-side by () ';
B one reacting gas is supplied to this cathode side by () ';
(c) ' stop for should reacting gas to this cathode side, and measure the concentration of this this reacting gas of cathode side, to obtain a new reacting gas concentration and the relation curve of time, and then reduce the time needed for measurement; And
Relatively this reacting gas concentration and the relation curve of the relation curve of time and new reacting gas concentration and time, to judge the fuel concentration of this unknown concentration.
2. fuel concentration measuring method as claimed in claim 1, wherein this fuel cell comprises a DMFC monomer.
3. fuel concentration measuring method as claimed in claim 1, wherein this reacting gas comprises air or oxygen.
4. fuel concentration measuring method as claimed in claim 1, wherein this fuel comprises methanol solution, ethanolic solution, or formic acid solution.
5. fuel concentration measuring method as claimed in claim 1, wherein the concentration of this reacting gas is measured by a sensor.
6. fuel concentration measuring method as claimed in claim 5, wherein this sensor comprises an oxygen concentration sensor or a pressure gauge.
7. fuel concentration measuring method as claimed in claim 1, wherein the concentration of the fuel of this unknown concentration judges the time dropping to a certain particular value institute palpus according to this reacting gas concentration.
8. fuel concentration measuring method as claimed in claim 1, wherein the concentration of the fuel of this unknown concentration is that the speed declined according to reacting gas concentration judges.
9. a fuel concentration measuring method, comprising:
There is provided a fuel cell, this fuel cell has an anode-side, a cathode side and at least one membrane electrode assembly;
Corresponding to the fuel of at least one concentration known, set up at least one product gas concentration and the relation curve of time, and the method setting up at least one product gas concentration and the relation curve of time comprises:
A the fuel of one concentration known is supplied to this anode-side by ();
B one reacting gas is supplied to this cathode side by ();
(c) stop for should reacting gas to this cathode side, and measure the concentration of this this product gas of cathode side, to obtain a product gas concentration and the relation curve of time;
A the fuel of one unknown concentration is supplied to this anode-side by () ';
B one reacting gas is supplied to this cathode side by () ';
(c) ' stop for should reacting gas to this cathode side, and measure the concentration of this this product gas of cathode side, to obtain a new product gas concentration and the relation curve of time, and then reduce the time needed for measurement; And
Relatively this product gas concentration and the relation curve of time and new product gas concentration and the relation curve of time, to judge the fuel concentration of this unknown concentration.
10. fuel concentration measuring method as claimed in claim 9, wherein the concentration of this product gas is measured by a sensor.
11. fuel concentration measuring methods as claimed in claim 10, wherein this sensor comprises carbon dioxide sensor.
12. fuel concentration measuring methods as claimed in claim 9, wherein the concentration of this product gas be according to this product gas concentration rise to a certain particular value must time judge, or according to this product gas concentration rise speed judge.
13. 1 kinds of fuel concentration measuring methods, comprising:
There is provided a fuel cell, this fuel cell has an anode-side, a cathode side and at least one membrane electrode assembly;
Corresponding to the fuel of at least one concentration known, set up the relation curve of at least one open-circuit voltage and time, and the method setting up the relation curve of at least one open-circuit voltage and time comprises:
A the fuel of one concentration known is supplied to this anode-side by ();
B one reacting gas is supplied to this cathode side by ();
(c) stop for should reacting gas to this cathode side, and measure this open-circuit voltage of this membrane electrode assembly, to obtain the relation curve of an open-circuit voltage and time;
A the fuel of one unknown concentration is supplied to this anode-side by () ';
B one reacting gas is supplied to this cathode side by () ';
(c) ' stop for should reacting gas to this cathode side, and measure this open-circuit voltage of this membrane electrode assembly, to obtain a new open-circuit voltage and the relation curve of time, and then reduce the time needed for measurement; And
Relatively this open-circuit voltage and the relation curve of the relation curve of time and new open-circuit voltage and time, to judge the fuel concentration of this unknown concentration.
14. fuel concentration measuring methods as claimed in claim 13, wherein the concentration of the fuel of this unknown concentration is that the time point declined according to this open-circuit voltage judges.
15. fuel concentration measuring methods as claimed in claim 13, wherein the concentration of the fuel of this unknown concentration be according to this open-circuit voltage drop to a certain particular value must time judge.
16. fuel concentration measuring methods as claimed in claim 13, wherein the concentration of the fuel of this unknown concentration is that the speed declined according to this open-circuit voltage judges.
17. fuel concentration measuring methods as claimed in claim 13, wherein this fuel cell comprises a DMFC monomer.
18. fuel concentration measuring methods as claimed in claim 13, wherein this reacting gas comprises air or oxygen.
19. fuel concentration measuring methods as claimed in claim 13, wherein this fuel comprises methanol solution, ethanolic solution, or formic acid solution.
20. 1 kinds of fuel concentration measuring methods, comprising:
There is provided a fuel cell, this fuel cell has an anode-side, a cathode side and at least one membrane electrode assembly;
Corresponding to the fuel of at least one concentration known, set up the relation curve of at least one output current and time, and the method setting up the relation curve of at least one output current and time comprises:
A the fuel of one concentration known is supplied to this anode-side by ();
B one reacting gas is supplied to this cathode side by ();
(c) stop for should reacting gas to this cathode side, and measure this output current of this membrane electrode assembly, to obtain the relation curve of an output current and time;
A the fuel of one unknown concentration is supplied to this anode-side by () ';
B one reacting gas is supplied to this cathode side by () ';
(c) ' stop for should reacting gas to this cathode side, and measure this output current of this membrane electrode assembly, to obtain a new output current and the relation curve of time, and then reduce the time needed for measurement; And
Relatively this output current and the relation curve of the relation curve of time and new output current and time, to judge the fuel concentration of this unknown concentration.
21. fuel concentration measuring methods as claimed in claim 20, wherein the concentration of the fuel of this unknown concentration is that the time point declined according to this output current judges.
22. fuel concentration measuring methods as claimed in claim 20, wherein the concentration of the fuel of this unknown concentration be according to this output current drop to a certain particular value must time judge.
23. fuel concentration measuring methods as claimed in claim 20, wherein the concentration of the fuel of this unknown concentration is that the speed declined according to output current judges.
24. fuel concentration measuring methods as claimed in claim 20, wherein this fuel cell comprises a DMFC monomer.
25. fuel concentration measuring methods as claimed in claim 20, wherein this reacting gas comprises air or oxygen.
26. fuel concentration measuring methods as claimed in claim 20, wherein this fuel comprises methanol solution, ethanolic solution, or formic acid solution.
27. 1 kinds of fuel concentration measuring methods, comprising:
There is provided a fuel cell, this fuel cell has an anode-side, a cathode side and at least one membrane electrode assembly;
Corresponding to the fuel of at least one concentration known, set up the relation curve of at least one output voltage and time, and the method setting up the relation curve of at least one output voltage and time comprises:
A the fuel of one concentration known is supplied to this anode-side by ();
B one reacting gas is supplied to this cathode side by ();
(c) stop for should reacting gas to this cathode side, and measure this output voltage of this membrane electrode assembly, to obtain the relation curve of an output voltage and time;
A the fuel of one unknown concentration is supplied to this anode-side by () ';
B one reacting gas is supplied to this cathode side by () ';
(c) ' stop for should reacting gas to this cathode side, and measure this output voltage of this membrane electrode assembly, to obtain a new output voltage and the relation curve of time, and then reduce the time needed for measurement; And
Relatively this output voltage and the relation curve of the relation curve of time and new output voltage and time, to judge the fuel concentration of this unknown concentration.
28. fuel concentration measuring methods as claimed in claim 27, wherein the concentration of the fuel of this unknown concentration is that the time point declined according to this output voltage judges.
29. fuel concentration measuring methods as claimed in claim 27, wherein the concentration of the fuel of this unknown concentration be according to this output voltage drop to a certain particular value must time judge.
30. fuel concentration measuring methods as claimed in claim 27, wherein the concentration of the fuel of this unknown concentration is that the speed declined according to output voltage judges.
31. fuel concentration measuring methods as claimed in claim 27, wherein this fuel cell comprises a DMFC monomer.
32. fuel concentration measuring methods as claimed in claim 27, wherein this reacting gas comprises air or oxygen.
33. fuel concentration measuring methods as claimed in claim 27, wherein this fuel comprises methanol solution, ethanolic solution, or formic acid solution.
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| CN201410538155.0A CN104316586A (en) | 2007-12-19 | 2008-12-01 | Fuel concentration measuring method |
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| CN200710300176 | 2007-12-19 | ||
| CN200710300176.9 | 2007-12-19 | ||
| CN201410538155.0A CN104316586A (en) | 2007-12-19 | 2008-12-01 | Fuel concentration measuring method |
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| US20030196913A1 (en) * | 2002-04-19 | 2003-10-23 | Tuyu Xie | Method of measuring methanol concentration in an arqueous solution |
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Application publication date: 20150128 |