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High-stability high-temperature membrane electrode for fuel cell and preparation method of high-stability high-temperature membrane electrode

A fuel cell membrane and high-temperature technology, applied in fuel cells, battery electrodes, circuits, etc., can solve problems that hinder the commercialization of HT-PEMFC, affect the stability of HT-PEMFC, increase the cost of HT-PEMFC, etc., and achieve excellent output Stability, load can be precisely controlled, and the effect of low cost

Active Publication Date: 2022-08-09
BEIHANG UNIV
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  • Abstract
  • Description
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Problems solved by technology

This dynamic migration process of phosphoric acid in the membrane electrode will cause a large amount of phosphoric acid in the electrolyte membrane to migrate continuously into the catalytic layer, which will easily cause "acid flooding" of the catalytic layer and reduce the effective "solid-liquid-gas" electrochemical three-phase The number of phase reaction interfaces and the adsorption of phosphate anions on the platinum surface seriously affect the stability of HT-PEMFC operation.
Therefore, in order to reduce the negative impact of phosphoric acid on the catalytic layer, a high platinum loading of the catalyst (usually in the range of 1.0 mg cm -2 above), which greatly increases the cost of HT-PEMFC and cannot meet the requirements of actual large-scale application, which seriously hinders the commercialization progress of HT-PEMFC

Method used

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  • High-stability high-temperature membrane electrode for fuel cell and preparation method of high-stability high-temperature membrane electrode
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  • High-stability high-temperature membrane electrode for fuel cell and preparation method of high-stability high-temperature membrane electrode

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preparation example Construction

[0039] The preparation method of the present invention mainly includes three steps: the preparation of the gas diffusion electrode, the construction of the interface layer and the assembly of the membrane electrode. The schematic diagram of the membrane electrode structure is as follows: figure 1 shown, as follows:

[0040] (1) Preparation of gas diffusion electrode

[0041] First, the platinum catalyst powder and polymer solution are dispersed in water or an organic solvent (such as isopropanol, ethanol, methanol, N,N dimethylformamide, N,N dimethylacetamide, dimethyl sulfoxide ) to form a catalyst ink, usually in a mass ratio of 1:1000 to 1:50. Then put the ink in an ultrasonic vibration machine or a high-speed homogenizer for a period of time until the ink reaches a certain viscosity, usually the ink viscosity is 2-300mPa s. It is then covered on the gas diffusion layer 1 by ultrasonic spraying, blade coating or screen printing.

[0042] The prepared gas diffusion layer ...

Embodiment 1

[0050] The platinum-based catalyst is a catalyst with a platinum content of 60 wt%, the preparation method of the gas diffusion electrode is spraying, the interface layer material is graphene, and the assembly method of the membrane electrode is a gas diffusion electrode with an interface layer on both sides of the cathode and the anode. The assembly process is as follows:

[0051] (1) Disperse 60 wt% Pt / C catalyst and PTFE emulsion in ethanol (25 mL), and the mass ratio of the two is 1:400. Ultrasonic dispersion was carried out in an ultrasonic cleaner for 6 hours to obtain a uniformly dispersed suspension.

[0052] (2) adding the above-mentioned obtained uniformly dispersed suspension into the syringe, then adjusting the injection speed and ultrasonic power, and the running speed of the nozzle, and uniformly spraying the obtained ink on the gas diffusion electrode by the ultrasonic spraying equipment, at 60 ℃ of the heating table drying under low temperature to obtain an un...

Embodiment 2

[0058] The platinum-based catalyst is a catalyst with a platinum content of 60wt%. The preparation method of the gas diffusion electrode is spraying. The interface layer material is XC-72 carbon ball powder. The assembly method of the membrane electrode is that the cathode side is a gas diffusion electrode with an interface layer. The anode side is a conventional gas diffusion electrode, and its preparation process is as follows:

[0059] (1) Disperse 60 wt% Pt / C catalyst and PTFE emulsion in isopropanol (25 mL), and the mass ratio of the two is 1:500. Ultrasonic in an ultrasonic cleaner for 30 mins to obtain a uniformly dispersed suspension.

[0060] (2) the above-mentioned obtained uniformly dispersed suspension is added into the syringe, then the injection speed, ultrasonic power, and nozzle running speed are adjusted, and the obtained ink is uniformly sprayed on the gas diffusion electrode by the ultrasonic spraying equipment, and the heating table is heated at 70 ° C. dr...

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Abstract

The invention discloses a high-stability high-temperature membrane electrode for a fuel cell and a preparation method of the high-stability high-temperature membrane electrode. The high-temperature membrane electrode comprises a high-temperature polymer electrolyte membrane, a gas diffusion electrode and a membrane-electrode interface layer, wherein an interface layer is introduced between the high-temperature polymer electrolyte membrane and the electrode, and the interface layer is composed of one or a mixture of more of a metal oxide with nano particle size, a water-insoluble heteropolyacid salt, a pyrophosphate nano carbon material and the like; the interface layer can effectively slow down the migration rate of phosphoric acid from the high-temperature polymer electrolyte membrane into the catalyst layer, improve the phosphoric acid retention capability of the electrolyte membrane and the membrane electrode, and further improve the working stability of the high-temperature membrane electrode; meanwhile, the interface layer can also improve the distribution of phosphoric acid in the catalyst layer and improve the output performance of the membrane electrode. The membrane electrode of the high-temperature polymer electrolyte membrane fuel cell is excellent in performance, good in working stability, simple in preparation method and suitable for industrial large-scale batch production.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a membrane electrode for a high-temperature polymer electrolyte membrane fuel cell and a preparation method thereof. Background technique [0002] The development of hydrogen energy is promoting the transformation of the global energy structure. The innovation of fuel cell technology is in line with the development trend of low-carbon, electrified, and distributed energy transportation in the world. It has attracted the attention of academic and industrial circles, especially polymer electrolyte membrane fuel cell technology. It has been commercialized and applied to vehicle and aerospace power systems on a large scale. [0003] Among them, the high temperature polymer electrolyte membrane fuel cell (HT-PEMFC) can simplify the water and heat management system of the fuel cell stack due to its high operating temperature (120-180°C), and improve the performance of ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M8/1004
CPCH01M4/8828H01M4/8882H01M8/1004Y02E60/50
Inventor 卢善富张巨佳张劲相艳
Owner BEIHANG UNIV
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