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High-temperature proton exchange membrane fuel cell membrane electrode and preparation method thereof

A proton exchange membrane and fuel cell membrane technology, applied in battery electrodes, fuel cell components, circuits, etc., can solve the problems of decreased battery stability and uncertain electrode acid content, so as to improve battery performance and ensure certainty , The effect of improving the effective active area

Active Publication Date: 2016-07-06
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method does not require additional introduction of acid into the electrode, but the acid content in the electrode is affected by the structure of the membrane and electrode and the redistribution of phosphoric acid, so the acid content in the electrode is uncertain
And too high acid content in the membrane is easy to damage the mechanical properties of the membrane and cause gas permeation, which in turn leads to a decrease in the long-term operation stability of the battery.

Method used

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  • High-temperature proton exchange membrane fuel cell membrane electrode and preparation method thereof
  • High-temperature proton exchange membrane fuel cell membrane electrode and preparation method thereof
  • High-temperature proton exchange membrane fuel cell membrane electrode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Treatment of high temperature proton exchange membranes: with figure 1 The ABPBI membrane 1 after 4h equilibration treatment was used as the proton exchange membrane for preparing high-temperature membrane electrodes, and the acid content of the membrane was 182wt.% after equilibration.

[0038] Anode and cathode gas diffusion electrodes: the anode and cathode gas diffusion electrodes use TorayTGP-H-60 as the support layer, and the carbon powder loading in the microporous layer is 1.8mg / cm 2 ; With 60% Pt / C (JM) as the catalyst, the catalyst loading in the catalytic layer is 0.9mgPt / cm 2 . Then according to the electrode area and the required acid content, take a certain amount of 85% concentrated phosphoric acid respectively, add water to dilute to a 40% mass concentration, then add 5 times the volume of ethanol to obtain an acid solution, and finally use a micro-dropper to anode and cathode respectively. The acid solution is spread on the gas diffusion electrode, an...

Embodiment 2

[0042] by figure 1 The ABPBI membrane 2 after 4h equilibration treatment was used as the proton exchange membrane for preparing high-temperature membrane electrodes, and the acid content of the membrane was 181wt.% after equilibration. The microporous layer and the catalytic layer in the anode and cathode gas diffusion electrodes are the same as in Example 1, but the content of phosphoric acid introduced on the anode and cathode gas diffusion electrodes is respectively 3.5 mg / cm 2 and 5.2mg / cm 2 .

[0043] After the obtained membrane electrode is assembled into a single cell, the test is carried out, the test conditions are the same as in Example 1, and the test results are as follows: Figure 4 shown. It can be seen from the figure that the battery is at 200mA / cm 2 The hourly discharge voltage can reach 653mV, and the maximum power density can reach 302mW / cm 2 .

Embodiment 3

[0045] Adsorb the ABPBI membrane at concentrated phosphoric acid at 40°C for 6 hours to obtain a film with an acid content of 457wt.%, then equilibrate the film at 22°C and a relative humidity of 50% for 8 hours, and finally maintain the acid content at about 177wt.%. , and use this membrane as a proton exchange membrane for preparing high-temperature membrane electrodes. The microporous layer and catalytic layer in the anode and cathode gas diffusion electrodes are the same as in Example 1, but the content of phosphoric acid introduced on the anode and cathode gas diffusion electrodes is respectively 8.2 mg / cm 2 and 9.9mg / cm 2 .

[0046] Gained membrane electrode was assembled into a single cell, and performance characterization was carried out under the same test conditions as in Example 1, and the results were as follows Figure 5 shown. Battery at 200mA / cm 2 The hourly discharge voltage is 610mV, and the maximum power density is 233mW / cm 2 , single cell at high curren...

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Abstract

The invention provides a high-temperature proton exchange membrane fuel cell membrane electrode, which an acid-doped high-temperature proton exchange membrane and acid-doped gas diffusion electrodes, wherein the acid-doped gas diffusion electrodes are arranged at two sides of the acid-doped high-temperature proton exchange membrane; the mass percentage of the acid doping amount in the high-temperature proton exchange membrane is 150-200wt.%; the acid doping amount of the unit electrode area in the gas diffusion electrodes is 1-10mg / cm<2>; and the preparation method of the high-temperature proton exchange membrane fuel cell membrane electrode comprises the following steps: carrying out acid soaking treatment and aftertreatment of the membrane to constant weight; uniformly arranging the acid-doped solution on the surface of each gas diffusion electrode and removing a solvent through vacuum drying; and carrying out hot-pressing and cooling on the acid-treated gas diffusion electrodes and the acid-doped membrane and then obtaining the high-temperature proton exchange membrane fuel cell membrane electrode. According to the method, the problem of the uncertainty of the effective acid doping amount in the proton exchange membrane can be effectively solved; and the membrane electrode preparation consistency is ensured.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a membrane electrode of a high-temperature proton exchange membrane fuel cell and a preparation method thereof. Background technique [0002] High-temperature operation (100-200 °C) of proton exchange membrane fuel cells (PEMFCs) is one of the effective ways to improve electrocatalyst activity and CO resistance, simplify hydrothermal management, and improve energy utilization. [0003] Polybenzimidazole is a kind of straight-chain aromatic heterocyclic high molecular polymer with benzimidazole repeating unit structure, which has outstanding thermal stability and film-forming performance, and the mechanical properties of the film material are excellent. The imidazole group has an affinity to acid, which can make the acid doped in the polymer framework, and the doped polybenzimidazole film has high proton conductivity at high temperature (100-200° C.). Phosphoric acid (H 3 PO ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M8/02
CPCY02E60/50
Inventor 孙公权李印华王素力
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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