CN110783588B - Method for regulating and controlling anode of fuel cell - Google Patents
Method for regulating and controlling anode of fuel cell Download PDFInfo
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- CN110783588B CN110783588B CN201910837477.8A CN201910837477A CN110783588B CN 110783588 B CN110783588 B CN 110783588B CN 201910837477 A CN201910837477 A CN 201910837477A CN 110783588 B CN110783588 B CN 110783588B
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- 239000000446 fuel Substances 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 35
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 12
- 230000001276 controlling effect Effects 0.000 title claims abstract description 9
- 239000002245 particle Substances 0.000 claims abstract description 31
- 239000003792 electrolyte Substances 0.000 claims abstract description 28
- 230000001737 promoting effect Effects 0.000 claims abstract description 18
- 238000003756 stirring Methods 0.000 claims abstract description 10
- 230000005672 electromagnetic field Effects 0.000 claims description 4
- 239000010406 cathode material Substances 0.000 claims 1
- 230000003750 conditioning effect Effects 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 26
- 230000033001 locomotion Effects 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 10
- 230000004888 barrier function Effects 0.000 abstract description 7
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 39
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 39
- 239000007789 gas Substances 0.000 description 29
- 239000000243 solution Substances 0.000 description 18
- 230000008569 process Effects 0.000 description 15
- 238000012360 testing method Methods 0.000 description 15
- 238000001514 detection method Methods 0.000 description 13
- 229910052759 nickel Inorganic materials 0.000 description 13
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 10
- 239000006260 foam Substances 0.000 description 7
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 6
- 239000004973 liquid crystal related substance Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 6
- 230000006872 improvement Effects 0.000 description 5
- 238000010248 power generation Methods 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 229910002804 graphite Inorganic materials 0.000 description 4
- 239000010439 graphite Substances 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000002484 cyclic voltammetry Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000013019 agitation Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- ZOMNIUBKTOKEHS-UHFFFAOYSA-L dimercury dichloride Chemical compound Cl[Hg][Hg]Cl ZOMNIUBKTOKEHS-UHFFFAOYSA-L 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000033116 oxidation-reduction process Effects 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910021586 Nickel(II) chloride Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 238000007743 anodising Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229940075397 calomel Drugs 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- KHYBPSFKEHXSLX-UHFFFAOYSA-N iminotitanium Chemical compound [Ti]=N KHYBPSFKEHXSLX-UHFFFAOYSA-N 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000009347 mechanical transmission Effects 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- QMMRZOWCJAIUJA-UHFFFAOYSA-L nickel dichloride Chemical compound Cl[Ni]Cl QMMRZOWCJAIUJA-UHFFFAOYSA-L 0.000 description 1
- 229910001000 nickel titanium Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04276—Arrangements for managing the electrolyte stream, e.g. heat exchange
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/008—Disposal or recycling of fuel cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M2004/8678—Inert electrodes with catalytic activity, e.g. for fuel cells characterised by the polarity
- H01M2004/8684—Negative electrodes
-
- 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
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/84—Recycling of batteries or fuel cells
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- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Fuel Cell (AREA)
Abstract
The invention relates to the field of fuel cells, in particular to a method for regulating and controlling an anode of a fuel cell. It includes: and applying a promoting magnetic field to the anode of the fuel cell, wherein the promoting magnetic field acts on the charged particles on the surface of the anode, and the charged particles on the surface of the anode are disturbed to further stir the electrolyte on the surface of the anode, so that the charged particles uniformly react on the surface of the anode and discharge the gas separated out from the anode. According to the invention, the anode is regulated and controlled by applying the accelerating magnetic field, so that the motion of charged particles on the surface of the anode can be disturbed, the disturbance effect on the electrolyte is further generated, and the uniformity of components in the electrolyte is favorably improved; by stirring the electrolyte on the surface of the anode, the problem that bubbles separated from the surface of the anode are enriched and continuously form a gas barrier layer can be avoided; the utilization rate of the anode of the fuel cell is effectively improved, the effective reaction area is increased, the discharge capacity of the cell is increased, and the efficiency of the fuel cell is improved.
Description
Technical Field
The invention relates to the field of fuel cells, in particular to a method for regulating and controlling an anode of a fuel cell.
Background
A fuel cell is a chemical device that directly converts chemical energy of fuel into a computer, and is also called an electrochemical generator. It is a fourth power generation technology following hydroelectric power generation, thermal power generation and atomic power generation. The fuel cell is high in efficiency because the gibbs free energy in the chemical energy of the fuel is partially converted into electric energy through electrochemical reaction without being limited by the carnot cycle effect. In addition, the fuel cell uses fuel and oxygen as raw materials, and has no mechanical transmission parts, so that the fuel cell has no noise pollution. The discharged harmful gas is very little. It follows that fuel cells are the most promising power generation technology from the viewpoint of energy conservation and ecological environment conservation.
However, existing fuel cells suffer from several drawbacks. Theoretically, the fuel cell can be operated at a conversion efficiency close to 100%, and has high economical efficiency, but various fuel cells actually operated at present have a total conversion efficiency within a range of 45-60% in most cases without considering heat removal utilization due to the limitation of various technical factors and the energy consumption of the whole device. The main limitation is that during the operation of the fuel cell, charged particles formed by an oxidizing gas such as oxygen at the cathode need to be transferred to the anode to cause a reaction, and the gas generated after the reaction is discharged. The gas barrier layer is mainly formed due to poor gas discharge, and has a problem of potential safety hazard. In addition, since the reaction area of the charged particles formed by the oxidizing gas in the fuel cell at the anode is small and the reaction efficiency is low, there is a problem that the generated current is small and limited.
To solve such problems, many technicians have made improvements to fuel cells. However, the current improvements are no more than improvements in fuel cell electrodes, electrolyte component systems, and control systems. As granted by the chinese patent office patent publication at 2010, 1/20, for multi-pressure regime control for relative humidity excursion minimization during transients, publication No. CN100583527, which controls the relative humidity of the cathode outlet gas during stack power transients by reducing the dynamic pressure range and thus the dynamic cathode outlet gas relative humidity range, to provide better cathode outlet gas relative humidity control. In one embodiment, the control system utilizes a first narrower cathode pressure range based on stack current density during stack power transients to provide better cathode outlet gas relative humidity control, and a second wider cathode pressure range based on stack current density during low and steady state current densities to improve system efficiency by reducing compressor parasitics. The system efficiency of the fuel cell can be improved, but the problems of unsmooth fuel cell exhaust and the like can not be solved well.
Disclosure of Invention
The invention provides a method for regulating and controlling a fuel cell anode, which aims to solve the problems that the gas generated by the anode of the existing fuel cell is difficult to discharge, a gas barrier layer is easy to form to block the movement of charged particles in the fuel cell and generate potential safety hazards, the utilization rate of the fuel cell anode is low and the like. It firstly achieves the following purposes: firstly, through stirring the electrolyte, bubbles separated out at the anode are prevented from forming a gas barrier layer; secondly, the disorder of the movement of the charged particles is improved, and the effective reaction area of the anode of the fuel cell is improved; and thirdly, the discharge current of the fuel cell is improved by regulating and controlling the anode, so that the applicability of the fuel cell is further expanded.
In order to achieve the purpose, the invention adopts the following technical scheme.
A method for regulating and controlling the anode of fuel cell,
the method comprises the following steps:
and applying a promoting magnetic field to the anode of the fuel cell, wherein the promoting magnetic field acts on the charged particles on the surface of the anode, and the charged particles on the surface of the anode are disturbed to further stir the electrolyte on the surface of the anode, so that the charged particles uniformly react on the surface of the anode and discharge the gas separated out from the anode.
The fuel cell inevitably generates gas during the reaction, and particularly at the surface of the anode thereof, charged particles move from the cathode to the anode and emit electrons to generate gas after moving to the anode. In the existing fuel cell, the improvement of the fuel cell is mostly started from the aspects of improving the structure and the components of an electrode, the components of an electrolyte and the like, or a special regulating and controlling system is arranged and equipped for a certain type or model of the fuel cell, but the improvement has great limitation, and any beneficial effect cannot be generated on the exhaust process of the fuel cell.
In the method of the present invention, the movement of the charged particles in the magnetic field is changed from the original linear movement state to a curved movement state by applying the magnetic field, the charged particles in the curved movement state can be regarded as a rotor with a small volume, and the electrolyte is agitated under the condition of a large amount of curved movement of ions.
After stirring the electrolyte, the gas that positive pole surface was appeared is difficult to form the enrichment in the electrolyte, can be discharged fast, and then solved fuel cell not smooth problem of exhaust, and, because the disturbance of charged particle to the electrolyte, the orderliness that can make charged particle move increases, in curvilinear motion process, charged particle is easy to be walked around the back of fuel cell positive pole (the one side that backs on the back with the negative pole promptly), react and appear and produce gas at the back of fuel cell positive pole, and then make the positive and negative homoenergetic of fuel cell positive pole obtain effectual utilization, increase the effective reaction area of fuel cell positive pole, and the efficiency of the reaction is improved, can improve fuel cell's discharge capacity.
As a preference, the first and second liquid crystal compositions are,
the facilitating magnetic field is comprised of one or more source magnetic fields.
The single source magnetic field can directly form a promoting magnetic field and can also form a complex promoting magnetic field through combination, the more complex the promoting magnetic field is, the larger the disorder of the motion of the charged particles in the electrolyte is, the better the problem of gas enrichment can be avoided, the charged particles can be dispersed more uniformly on the front side and the back side of the anode, and the generated beneficial effect is more obvious.
As a preference, the first and second liquid crystal compositions are,
the source magnetic field is a constant magnetic field or a time-varying electromagnetic field.
Under the disturbance action of the constant magnetic field, the curvilinear motion of the charged particles still has certain stability, and the stirring effect of the curvilinear motion of the charged particles on the electrolyte is relatively smooth, while under the action of the time-varying electromagnetic field, the stirring of the electrolyte by the charged particles has certain periodicity, and the fuel cell needs to stably stir the electrolyte so as to continuously discharge the gas and maintain the uniformity of the charged particles in the electrolyte on the surface of the anode.
As a preference, the first and second liquid crystal compositions are,
the source magnetic field constituting the accelerating magnetic field has at least one constant magnetic field.
The fuel cell needs a more stable disturbance effect on the continuity of the charged particles generated by the constant magnetic field, so that the effect generated by the constant magnetic field is better than that of a time-varying electromagnetic field, and a better regulation and control effect can be generated on the anode of the fuel cell in a promoting magnetic field formed by taking at least one constant magnetic field as a source magnetic field.
As a preference, the first and second liquid crystal compositions are,
the magnetic field intensity of the accelerating magnetic field is more than or equal to 1.4T.
Since in the fuel cell, the main object of forming the barrier is bubbles in the electrolyte that are precipitated from the anode surface, which is greater in barrier effect than the conventional enriched layer of charged particles, a larger magnetic field is required to move the charged particles to keep the electrolyte agitated, and it is ensured that the agitation has a certain intensity.
As a preference, the first and second liquid crystal compositions are,
the magnetic field intensity of the promotion magnetic field is 2.0-2.8T.
Within this range of magnetic field strength, the resulting electrolyte agitation is effective, and when the magnetic field strength is too high, it is rather likely that the charged particles will react at the anode, reducing the fuel cell efficiency.
As a preference, the first and second liquid crystal compositions are,
the accelerating magnetic field acts within 5mm of the surface of the anode of the fuel cell.
The promoting magnetic field acting in the range can generate good promoting and regulating effects on the fuel cell.
The invention has the beneficial effects that:
1) the anode is regulated and controlled by applying the accelerating magnetic field, so that the motion of charged particles on the surface of the anode can be disturbed, the disturbance effect on the electrolyte is further generated, and the uniformity of components in the electrolyte is favorably improved;
2) by stirring the electrolyte on the surface of the anode, the problem that bubbles separated from the surface of the anode are enriched and continuously form a gas barrier layer can be avoided;
3) the utilization rate of the anode of the fuel cell is effectively improved, the effective reaction area is increased, the discharge capacity of the cell is increased, and the efficiency of the fuel cell is improved.
Detailed Description
The present invention will be described in further detail with reference to specific examples. Those skilled in the art will be able to implement the invention based on these teachings. Moreover, the embodiments of the present invention described in the following description are generally only some embodiments of the present invention, and not all embodiments. Therefore, all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort shall fall within the protection scope of the present invention.
Unless otherwise specified, the raw materials used in the examples of the present invention are all commercially available or available to those skilled in the art; unless otherwise specified, the methods used in the examples of the present invention are all those known to those skilled in the art.
Example 1
Under the condition that the ambient temperature is 20 +/-1 ℃, a foamed nickel sheet (PPI is 100, the thickness is 1.5mm, the width is 1.5cm, and the length is 2.5 cm) is used as a working electrode, a graphite electrode is used as a counter electrode, the distance between the foamed nickel sheet and graphite is 200mm, a calomel electrode is used as a reference electrode, a methanol/potassium hydroxide solution is used as an electrolyte (the concentrations of methanol and potassium hydroxide are both 1M), a fuel cell electrochemical system for routine experiments is built, and a promoting magnetic field is applied to the foamed nickel sheet (within 5mm of the surface). The promotion magnetic field is provided by the strong permanent magnet, and the source magnetic field generated by the strong permanent magnet acts on the foam nickel sheet to form the promotion magnetic field with the intensity of 1.5-1.7T.
The reaction current of the methanol fuel cell system is detected by using a CHI760E electrochemical workstation, the initial voltage of the detection process is 0V, the termination voltage is 1.2V, and the sweep rate is 0.1V/s. The peak current density at the termination voltage is 212mA/cm through detection2And a distinct redox peak is generated.
Example 2
The specific process is the same as that of the embodiment 1, except that the promoting magnetic field is formed by combining an alternating current electromagnet and a direct current electromagnet, is a complex source magnetic field, and the magnetic field intensity of the promoting magnetic field formed by acting on the surface of the foam nickel sheet within the range of 5mm is 2.1-2.8T.
And detecting the reaction current of the methanol fuel cell system by using the CHI760E electrochemical workstation, wherein the initial voltage of the detection process is 0V, the final voltage of the detection process is 1.2V, and the sweep rate is 0.1V/s. The peak current density at the termination voltage is 247mA/cm2And a distinct redox peak is generated.
Example 3
The specific steps are the same as those of the embodiment 1, except that the promoting magnetic field is provided by a constant magnetic field generated by a direct current electromagnet, and the magnetic field intensity of the promoting magnetic field which is formed within the range of 5mm on the surface of the foam nickel sheet is 1.4-1.6T.
And detecting the reaction current of the methanol fuel cell system by using the CHI760E electrochemical workstation, wherein the initial voltage of the detection process is 0V, the final voltage of the detection process is 1.2V, and the sweep rate is 0.1V/s. The peak current density at the termination voltage is detected to be 207mA/cm2And a distinct redox peak is generated.
Example 4
The specific procedure is the same as that of example 1, and the methanol fuel cell system reaction current is detected by using CHI760E electrochemical workstation, and simultaneously, a photo is taken every 100ms by using infrared remote sensing shooting and the gas generated in the reaction process is detected by using continuous exposure.
The peak current density at the termination voltage is 210mA/cm through detection2And obvious oxidation reduction peaks are generated, and the generated gas quickly rises on the surface of the foamed nickel sheet and is released from the solution and enters the air, and no gas is basically left in the solution at the moment of the end of the reaction.
Example 5
The specific procedure was the same as in example 1, except that 0.1mL/L of a fluorescent agent was added to the electrolyte to allow observation of the flow state of the solution, and recording was performed by continuous exposure.
And detecting the reaction current of the methanol fuel cell system by using the CHI760E electrochemical workstation, wherein the initial voltage of the detection process is 0V, the final voltage of the detection process is 1.2V, and the sweep rate is 0.1V/s. The peak current density at the termination voltage is 214mA/cm2And obvious oxidation reduction peaks are generated, and the solution flow has high messiness in the reaction process.
Comparative example 1
The procedure was the same as in example 1, except that the accelerating magnetic field was not applied.
The electrochemical workstation CHI760E is also used for detecting the reaction current of the methanol fuel cell system, and the detection processThe initial voltage is 0V, the final voltage is 1.2V, and the sweep rate is 0.1V/s. The peak current density at the termination voltage is 142mA/cm2The redox peak was not evident.
Comparative example 2
The procedure was the same as in example 4, except that the accelerating magnetic field was not applied.
The methanol fuel cell system reaction current was also detected by using CHI760E electrochemical workstation, and simultaneously gas generated during the reaction was detected by taking a photograph every 100ms by infrared telemetering and by continuous exposure.
The peak current density at the termination voltage is detected to be 141mA/cm2The redox peak is not obvious, the generated gas is slightly enriched on the surface of the foam nickel sheet and from the surface of the foam nickel sheet, the releasing speed from the solution is slow, the residual gas on the surface of the foam nickel sheet can be obviously observed in the solution at the moment of the reaction, and a small amount of bubble residue can be observed after the foam nickel sheet is taken out.
Comparative example 3
The procedure was the same as in example 5, except that the accelerating magnetic field was not applied.
0.1mL/L of fluorescent agent is added into the electrolyte to realize the observation of the flowing state of the solution, and the recording is carried out by utilizing a continuous exposure mode.
And detecting the reaction current of the methanol fuel cell system by using the CHI760E electrochemical workstation, wherein the initial voltage of the detection process is 0V, the final voltage of the detection process is 1.2V, and the sweep rate is 0.1V/s. The peak current density at the termination voltage is 139mA/cm through detection2The redox peak is not obvious, and in the reaction process, the solution flow is in high order, the discharge process is the trend that the foamed nickel sheet flows to the graphite electrode, and conversely, the charge process is the trend that the graphite electrode flows to the foamed nickel sheet.
By combining the above examples 1 to 5 and comparative examples 1 to 3, the following conclusions can be clearly obtained:
after the promotion magnetic field is applied, the discharge current of the conventional fuel cell system can be obviously improved, the release of the generated gas is promoted, the enrichment of the gas is avoided, the disorder of the solution is improved under the action of the promotion magnetic field, and an excellent technical effect is generated.
Example 6
A fuel cell system was constructed, and the specific flow thereof was as follows.
Preparing a working electrode: placing Ni-Ti alloy with Ni content of 50.1 at% in electrolyte containing 0.15M ammonium sulfate and 0.2M ethylene glycol/glycerol with ethylene glycol content of 5% VOL, anodizing for 90min, reducing at 500 deg.C in hydrogen atmosphere for 2 hr, and sequentially adding 0.2M NiCl2·6H2Oethanol solution and 0.2M NH4Soaking in OH ethanol solution at normal temperature (25 +/-1 ℃) for 12 hours to obtain Ni (OH)2NTOs electrodes. In the same manner, 30 pieces of Ni (OH) having a size of 1X 2cm and a thickness of about 1mm were prepared in total2NTOs electrodes.
Building a test system: with the resultant Ni (OH)2the/NTOs electrode is used as a working electrode, the platinum electrode is used as a counter electrode, the saturated calomel electrode is used as a reference electrode, and a cyclic voltammetry curve test is carried out by utilizing an electrochemical workstation CHI-760 (Shanghai Chenghua). The test scanning potential is 0-1V, the scanning speed is 0.05V/s, the environmental temperature is 25 +/-1 ℃, the solution system is a mixed aqueous solution of potassium hydroxide and formaldehyde, the concentration of the potassium hydroxide is 1.0M, and the concentration of the formaldehyde is 0.5M.
Thirty pieces of Ni (OH) are prepared2the/NTOs electrodes were divided into two groups, one of which was numbered S6C1-S6C15 and the other was numbered S6N1-S6N15, and applied with the same magnetic field as described in example 2 when performing cyclic voltammetry tests at S6C1-S6C15, except that the magnetic field was promoted to act on Ni (OH)2The surface of the/NTOs electrode is within 5 mm. S6N1-S6N15 performed the same test but without the application of a facilitating magnetic field. The solution is replaced once after three times of cyclic voltammetry curve tests are carried out, and the stability of the concentration of components in a solution system during the test is ensured. Ni (OH) at Nos. S6C13-S6C15 and S6N13-S6N1520.1mL/L fluorescent agent is added into a solution system of the NTOs electrode during testing so as to realize the observation of the flowing state of the solution and simultaneously facilitate the observation of the flowing state of the solutionThe recording was performed by means of continuous exposure.
Tests show that the Ni (OH) with the numbers S6C1-S6C15 and S6N1-S6N152the/NTOs electrodes all have methanol oxidation peaks around 0.72V in the test process, and the methanol catalytic oxidation reaction is proved to be carried out. But in the case of Ni (OH) Nos. S6N1-S6N152In the/NTOs electrode test system, the oxidation peak current value is about 38.1-39.0 mA/cm-2And Ni (OH) at numbers S6C1-S6C152In the/NTOs electrode test system, the oxidation peak current value can reach 44.6-46.1 mA/cm-2It is obvious that the catalytic oxidation reaction of methanol is obviously promoted after the promoting magnetic field is applied, so that a larger oxidation peak current value is generated.
And Ni (OH) from numbers S6C13-S6C15 and numbers S6N13-S6N152The number S6C13-S6C15 of Ni (OH) can be seen in the NTOs electrode test2The flow of solution in the test system of the/NTOs electrode is more disordered, the surface of the working electrode has no bubble enrichment, and the number is S6N13-S6N15 Ni (OH)2The flow of the solution in the NTOs electrode test system has stronger directivity, and the surface of the working electrode has bubble enrichment.
In summary, it can be seen that the technical scheme of the invention can generate very obvious promotion and optimization effects on the fuel cell.
Claims (5)
1. A method for regulating and controlling an anode of a fuel cell,
the method comprises the following steps:
applying a promoting magnetic field to the anode of the fuel cell, wherein the promoting magnetic field acts on the charged particles on the surface of the anode, and disturbs the charged particles on the surface of the anode to further stir the electrolyte on the surface of the anode, so that the charged particles uniformly react on the surface of the anode and discharge gas separated out from the anode; the magnetic field intensity of the promotion magnetic field is 2.0-2.8T.
2. The method of claim 1, wherein the anode comprises a cathode material,
the facilitating magnetic field is comprised of one or more source magnetic fields.
3. The method of claim 2, wherein the anode of the fuel cell is a cathode,
the source magnetic field is a constant magnetic field or a time-varying electromagnetic field.
4. The method of claim 3, wherein the anode is a cathode of a fuel cell,
the source magnetic field constituting the accelerating magnetic field has at least one constant magnetic field.
5. The method of claim 1 or 2 or 3 or 4 for conditioning a fuel cell anode,
the accelerating magnetic field acts within 5mm of the surface of the anode of the fuel cell.
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