Method for increase of service life of fuel cell
A fuel cell and fuel cell stack technology, applied in the direction of fuel cells, fuel cell additives, fuel cell grouping, etc., can solve the problems of shortened life, fuel cell performance degradation, proton exchange membrane thickness reduction, etc., to prolong life, The effect of reducing the amount of performance degradation
Inactive Publication Date: 2010-10-06
TSINGHUA UNIV
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However, it was pointed out that the continuous purging of gas at open circuit voltage would lead to a substantial reduction in the thickness of the proton exchange membrane (such as S.Y.Lee, E.A.Cho, J.H.Lee, et al.Effects of purging on the degradation of PEMFCs operating with repetitive on / off cycles[J].Journal of the Electrochem, 2007, 154(2): B194-B200), the proton exchange membrane is the carrier of the catalyst. When the thickness becomes smaller, the catalyst will be lost in large quantities, which will reduce the performance of the fuel cell and shorten the service life
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[0015] When the method of the present invention is not used, the fuel cell will maintain a relatively high open-circuit voltage without using an external load to quickly eliminate the residual charge after the fuel cell is shut down. At this time, the operation process after shutdown is as follows:
[0016] 1) After the fuel cell stops working, observe the voltage change on the fuel cell stack. The open circuit voltage should maintain a high voltage for about 3 minutes (the average voltage of a single chip > 0.8V), and then the open circuit voltage will gradually decrease, as shown in figure 2 ;
[0017] 2) After 25 minutes, the single-chip voltage of the fuel cell drops below 0.1 volts, and the discharge process ends at this time;
[0018] 3) Restart the fuel cell to enter the next start-stop process;
[0019] 4) Measure the steady-state polarization curve after every 10 start-stop operations. The test conditions are as follows: image 3 As shown in Table 1, the current d...
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A method for prolonging useful time of a fuel cell belongs to field of fuel cell. The method comprises a fuel cell stack(1), a discharge load(2) and a switch(3) which are sequentially connected to be a set of a circuit system; after the fuel cell stops, the switch(3) closes to discharge the fuel cell stack by the discharge load(2) and fast eliminate residual electric charge on the fuel cell stack(1); after voltages of each sheet on the fuel cell stack(1) are all lower than 0.1 volt, the discharge load(2) is cut off by the switch(3). Selection of the discharge load(2) is determined on the basis of actual open circuit voltage of the fuel cell stack to make sure that voltages of each sheet on the fuel cell stack are all lower than 0.1 volt in 5 seconds after the switch(3) is closed. Comparedto that discharge treatment is not carried out after the fuel cell is stopped in prior art, the method of present invention can obviously reduce performance attenuation of the fuel cell and prolong useful life of the fuel cell.
Description
technical field [0001] The invention relates to a method for prolonging the service life of a fuel cell, which belongs to the technical field of fuel cells. Background technique [0002] A fuel cell is an electrochemical device that directly converts the chemical energy of fuel (and oxidant) into electrical energy under the action of a catalyst. Fuel cells have attracted more and more attention from governments due to their advantages of high energy conversion rate and zero pollution. In recent years, with the efforts of governments and institutions of various countries, fuel cell technology has made great progress. However, to meet the requirements of commercialization, fuel cells must not only meet performance requirements, but also have good stability, reliability and Lifespan (Hou Zhongjun, Yi Baolian. Progress in Research on Performance Decay of Proton Exchange Membrane Fuel Cells. Power Technology. 2005, 29(7): 482-487). The rated operating voltage of fuel cells for ...
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IPC IPC(8): H01M8/04H01M8/10H01M8/24H01M8/04303H01M8/1007H01M8/2457
CPCY02E60/521Y02E60/50
Inventor 裴普成常茜菲
Owner TSINGHUA UNIV