CN-122000385-A - Proton exchange membrane endurance test method

CN122000385ACN 122000385 ACN122000385 ACN 122000385ACN-122000385-A

Abstract

The invention provides a durability test method of a proton exchange membrane, which relates to the technical field of proton exchange membrane fuel cells, and comprises the steps of respectively coating coatings on two sides of the proton exchange membrane, and respectively attaching film layers on the outer sides of the coatings on the two sides to prepare single cells, and then carrying out durability test on the single cells by adopting a fuel cell test platform, wherein the coatings comprise substances for accelerating chemical degradation of the proton exchange membrane. Compared with the existing method for testing the durability of the proton exchange membrane by adopting the membrane electrode, the method for testing the durability of the proton exchange membrane does not comprise the attenuation of the cathode catalytic layer and the attenuation of the gas diffusion layer, can truly reflect the durability of the proton exchange membrane, and has the advantages of simple operation steps, convenience, practicability, no need of hydrogen and lower cost.

Inventors

GUO YUNXIA
SHEN PENG
YANG HAORAN
ZHAI HAIPENG

Assignees

未势能源科技有限公司

Dates

Publication Date: 20260508
Application Date: 20241107

Claims (10)

1. A durability test method for a proton exchange membrane is characterized by comprising the following steps: Coating the two sides of the proton exchange membrane respectively; Respectively attaching film layers on the outer sides of the coatings on two sides to prepare single cells; Performing durability test on the single cells by adopting a fuel cell test platform; wherein the coating comprises substances for accelerating the chemical degradation of the proton exchange membrane.
2. The method for durability testing a proton exchange membrane according to claim 1, wherein: The components of the substance contain hydrogen peroxide.
3. The method for durability testing a proton exchange membrane according to claim 2, wherein: The substance is prepared by mixing hydrogen peroxide gel and ferrous ammonium sulfate.
4. The method for durability testing a proton exchange membrane according to claim 1, wherein: The film layer is made of polytetrafluoroethylene.
5. The method for durability testing a proton exchange membrane according to claim 1, wherein: Wherein the thickness of the film layer on one side is 2-6 mu m, the porosity is 20-50%, and the pore diameter is 0.05-0.5 mu m; the thickness of the film layer on the other side is 8-15 μm, the porosity is 40-70%, and the pore diameter is 0.1-1 μm.
6. The proton exchange membrane durability test method according to claim 1, characterized in that: the durability test of the single cell by using the fuel cell test platform comprises the following steps: loading the single cells into the fuel cell test platform; performing cycle test on the single cell according to preset cycle times; and introducing gas to the two sides of the single cell according to a preset strategy.
7. The method for durability testing a proton exchange membrane according to claim 6 wherein: the gas may be air or nitrogen, and/or, The preset cycle times are 2000-2500 times.
8. The method for durability testing a proton exchange membrane according to claim 6 wherein: The preset strategy comprises the steps of respectively introducing gas under preset conditions to two sides of the single cell in a plurality of steps which are sequentially carried out; wherein the ventilation time of each step is 25S-35S, the preset conditions comprise the pressure, the temperature and the humidity of the gas, and at least one preset condition is different among different steps.
9. The proton exchange membrane durability test method according to any one of claims 1 to 8, wherein: before the coating layers are respectively coated on the two sides of the proton exchange membrane, the testing method further comprises the following steps: Performing a first performance test on the proton exchange membrane; after the durability test of the single cells using the fuel cell test platform, the test method further comprises: removing the film layer and the coating layer on both sides of the single cell, cleaning and drying the proton exchange membrane, and performing a second performance test; and comparing the test results of the first performance test and the second performance test to determine whether the durability of the proton exchange membrane is qualified.
10. The method for durability testing a proton exchange membrane according to claim 9 wherein: The first performance test and the second performance test are the same in test method, and each of the first performance test and the second performance test includes at least one of an ion exchange equivalent test, a proton conductivity test, and a weight test, and/or, The cleaning of the proton exchange membrane comprises deionized water cleaning and ultrasonic cleaning in sequence, and the drying of the proton exchange membrane comprises drying.

Description

Proton exchange membrane endurance test method Technical Field The invention relates to the field of proton exchange membrane fuel cell technology (Proton Exchange Membrane Fuel Cell, PEMFC), in particular to a proton exchange membrane endurance test method. Background The hydrogen fuel cell is a device for directly converting hydrogen and oxygen into electric energy through chemical reaction, and is widely used in the fields of automobiles, portable equipment, fixed power stations, standby power systems and the like due to the advantages of environmental protection, high energy density, low emission, rapid charging and the like. The membrane electrode (Membrane Electrode Assembly, MEA for short) is the core component of a hydrogen fuel cell and is typically composed of a proton exchange membrane (Proton Exchange Membrane, PEM), a catalytic layer, and a gas diffusion layer. In the membrane electrode, the proton exchange membrane plays a crucial role in the membrane electrode, and is used as a proton conducting medium, an electron insulating medium and isolating fuel and oxidant, so that the durability of the proton exchange membrane plays a decisive role in the durability of the fuel cell, and is one of main factors restricting the durability of the fuel cell. Proton exchange membranes are mainly made of polymeric materials, with perfluorosulfonic acid (Perfluorosulfonic acid, PFSA) membranes being the most common. At present, the commonly used proton exchange membrane durability evaluation methods mainly comprise the following three methods: The mechanical durability of the proton exchange membrane is tested by adopting a dry-wet cycle test, 20,000 cycles are tested, one cycle is performed every 4 minutes, and the test period is 56 days. In the second method, the proton exchange membrane is tested by adopting an open circuit voltage, the test duration is 500h, and the test period is 21 days. Method three, proton exchange membrane chemical/mechanical endurance test, test 20,000 cycles, one cycle every 75s, test period is 18 days. The disadvantages of the above test method are: The products tested by the method one to the method three are membrane electrodes, and not only comprise attenuation of a proton exchange membrane, but also comprise attenuation of a cathode catalytic layer and an anode catalytic layer and attenuation of a gas diffusion layer (carbon paper), so that the attenuation condition of the proton exchange membrane cannot be reflected truly. Disclosure of Invention In view of the above, the present invention is directed to a method for testing durability of a proton exchange membrane, so as to truly reflect the durability of the proton exchange membrane. In order to achieve the above purpose, the technical scheme of the invention is realized as follows: a proton exchange membrane endurance test method comprising: Coating the two sides of the proton exchange membrane respectively; Respectively attaching film layers on the outer sides of the coatings on two sides to prepare single cells; Performing durability test on the single cells by adopting a fuel cell test platform; wherein the coating comprises substances for accelerating the chemical degradation of the proton exchange membrane. Further, the components of the substance contain hydrogen peroxide. Further, the substance is prepared by mixing hydrogen peroxide gel and ferrous ammonium sulfate. Further, the film layer is made of polytetrafluoroethylene. Further, the thickness of the film layer on one side is 2-6 μm, the porosity is 20-50%, and the pore diameter is 0.05-0.5 μm; the thickness of the film layer on the other side is 8-15 μm, the porosity is 40-70%, and the pore diameter is 0.1-1 μm. Further, the durability test of the single cell by using the fuel cell test platform includes: loading the single cells into the fuel cell test platform; performing cycle test on the single cell according to preset cycle times; and introducing gas to the two sides of the single cell according to a preset strategy. Further, the gas is air or nitrogen, and/or, The preset cycle times are 2000-2500 times. Further, the preset strategy comprises the steps of respectively introducing gas under preset conditions to two sides of the single cell in a plurality of steps which are sequentially carried out; wherein the ventilation time of each step is 25S-35S, the preset conditions comprise the pressure, the temperature and the humidity of the gas, and at least one preset condition is different among different steps. Further, before coating the two sides of the proton exchange membrane respectively, the testing method further comprises the step of performing a first performance test on the proton exchange membrane, After the durability test of the single cells using the fuel cell test platform, the test method further comprises: removing the film layer and the coating layer on both sides of the single cell, cleaning and drying the proton exchange membrane, and per