A method for recovering the performance of low-efficiency membrane electrodes in proton exchange membrane fuel cells

A proton exchange membrane, fuel cell technology, applied in fuel cells, fuel cell additives, circuits, etc., can solve problems such as limited functions and poor practicability, and achieve the effects of strong practicability, recovery performance, and uniform dispersion.

Inactive Publication Date: 2016-02-17
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Invention patent "A method for recovering the performance of a poisoned proton exchange membrane fuel cell" (application number: 200510136748.5, publication date: July 4, 2007), mainly applicable to single-cell batteries, for H 2 Gas impurities such as S can restore the performance of the catalyst after poisoning, and it is not suitable for the performance attenuation of the stack operating under low-humidity and low-flow air for a long time. This method has limited functions and poor practicability.

Method used

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  • A method for recovering the performance of low-efficiency membrane electrodes in proton exchange membrane fuel cells
  • A method for recovering the performance of low-efficiency membrane electrodes in proton exchange membrane fuel cells
  • A method for recovering the performance of low-efficiency membrane electrodes in proton exchange membrane fuel cells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Select the electric stack with severe performance degradation of a single battery in the backup power supply (fuel cell backup power supply), and test the voltage-current curve of the battery, see figure 1 shown. Connect N to the stack 2 For purging, input 60°C deionized water into the cooling fluid channel of the stack, use deionized water to raise the temperature of the stack to 60°C, and the cathode (air channel) and anode (hydrogen channel) are respectively fed with saturated humidification air and H without humidification 2 , use the load to load the current to the stack, according to the interval of 10A as a step, the current is gradually loaded from the open circuit to 200A, the duration of each current is 0.5 minutes, continue to load the current to 350A, the duration of each current For 2-6 minutes, quickly reduce the load current to the open circuit state, and the current is loaded twice from low-high-low cycle, and the active area of ​​the battery is 250cm ...

Embodiment 2

[0031] The 110-cell stack of backup power supply with attenuated performance is processed, and the difference from Embodiment 1 is that the circulating current is loaded 4 times. The voltage-current curves of the stack before and after treatment are shown in figure 2 shown.

[0032] The treated stack is operated at a constant current at a rated current of 130A, monitor the change of the stack voltage with time, and record the voltage-time curve, see image 3 shown.

Embodiment 3

[0034] Use the low-high-low circulating current method to deal with the 50-cell stack of backup power supply with attenuated performance. The voltage-current curves of the stack before and after treatment are shown in Figure 4 shown.

[0035] The above-mentioned embodiments are only three cases, and the present invention is not limited to these cases. It can be seen from the examples that after the standby power supply has been running for a long time, the overall performance of the single battery or the stack in the stack will be attenuated. At this time, the method of loading low-high-low cycle current can restore the performance of the membrane electrode. Performance and good stability prolong the service life of the stack.

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Abstract

The invention relates to a method for restoring performance of an inefficient membrane electrode of a proton exchange membrane fuel cell. According to the method, a low-high-low loop current method is adopted, a high power load is used for loading current to a pile, meanwhile saturated humidified air and non-humidified hydrogen are respectively filled into the cathode and the anode of the pile to humidify a proton exchange membrane, a reaction channel is established, and a catalyst is promoted to be dispersed uniformly so as to restore the performance of the inefficient membrane electrode. Compared with the prior art, the method provided by the invention is suitable for a proton exchange membrane fuel cell stack, the performance of the inefficient membrane electrode of the proton exchange membrane fuel cell can be restored by simple and quick treatment without detaching the cell stack, and the structure of the membrane electrode is not damaged.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a method for restoring the performance of low-efficiency membrane electrodes of proton exchange membrane fuel cells. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is a power generation device that directly converts the chemical energy of oxidants and fuels into electrical energy through electrochemical reactions. Large size, low working temperature, compact structure, and quick response to load changes, etc., have extremely broad application prospects in portable power supplies and mobile power supplies. [0003] Membrane electrodes, as the core components of proton exchange membrane fuel cells, are usually composed of a cathode, a proton exchange membrane and an anode that are pressed together. The membrane electrode is placed between the deflector of the anode fuel and the deflector of the cathode oxidant, and the fuel cell composed in this way is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/04H01M8/04828
CPCH01M8/04126H01M8/04895Y02E60/50
Inventor 张智明张娟楠章桐
Owner TONGJI UNIV
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