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

A proton exchange membrane and fuel cell technology, applied in the field of electrochemical energy, can solve the problems of reduced porosity, reduced electrical conductivity, and hindered active sites, etc., to achieve the effect of increasing the reaction three-phase interface, improving performance, and reducing occupancy

Inactive Publication Date: 2017-04-05
SHENZHEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, high-temperature proton exchange membrane fuel cells have a fatal shortcoming: poor durability and low lifespan
However, the introduction of the binder phase will lead to: 1. The porosity is reduced, thereby increasing the mass transfer limitation; 2. When the excess is used, the active sites are seriously hindered, thereby reducing the active area of ​​the catalyst and reducing the conductivity.

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

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preparation example Construction

[0028] An embodiment of the present invention provides a method for preparing a high-temperature proton exchange membrane fuel cell, comprising the following steps:

[0029] preparing a binder-free catalyst slurry, coating the catalyst slurry on a gas diffusion layer (GDL), and drying to obtain an electrode; adding acid to the electrode;

[0030] Soak the PBI film in the phosphoric acid solution to obtain the phosphoric acid-doped polybenzimidazole film, which is the soaked film;

[0031] An MEA is composed of the acid-treated electrode and the soaked membrane, and the MEA is assembled into a high-temperature proton exchange membrane fuel cell.

[0032] The preparation method of the high-temperature proton exchange membrane fuel cell provided by the embodiment of the present invention uses the method of adding acid to the electrode without binder, instead of adding the binder when preparing the catalyst layer, and only utilizes the capillary action of the catalyst layer Maint...

Embodiment 1

[0047] The electrode preparation process is as follows: mix 0.0360g Pt / C (40wt%Pt) catalyst with 100mL of absolute ethanol, sonicate at room temperature for at least 1h, so that the catalyst is evenly dispersed in the ethanol solution, and the sonicated solution is transferred to 25mL In the syringe, the liquid flow rate is 0.5mL / min, the temperature of the heating plate is controlled at 60°C, and the distance from the nozzle to the leveling carbon paper is 30mm. Spray the slurry on the carbon paper and place it at room temperature for 12 hours to completely evaporate the ethanol. , to obtain a binder-free electrode with an actual Pt loading of 0.5 mg / cm 2 .

[0048] The preparation process of MEA is as follows: firstly, the 3.5×3.5cm 2 The PBI film was immersed in 85wt% phosphoric acid solution for at least 12 hours, sealed, and the temperature was controlled at 80° C., so that the doping amount of phosphoric acid in the film was 3.5 times. Cut the adhesive-free electrode i...

Embodiment 2

[0052] The electrode preparation process is as follows: mix 0.0838g Pt / C (40wt%Pt) catalyst with 200mL of absolute ethanol, sonicate at room temperature for at least 1h, so that the catalyst is evenly dispersed in the ethanol solution, and the sonicated solution is transferred to 25mL In the syringe, the liquid flow rate is 0.4mL / min, the temperature of the heating plate is controlled at 60°C, and the distance from the nozzle to the leveling carbon paper is 30mm. Spray the slurry on the carbon paper and place it at room temperature for 12 hours to completely evaporate the ethanol. , to obtain a binder-free electrode with an actual Pt loading of 0.67 mg / cm 2 .

[0053] The preparation process of MEA is as follows: firstly, the 3.5×3.5cm 2 The PBI film was soaked in 85wt% phosphoric acid solution for at least 12 hours, sealed, and the temperature was controlled at 80° C. to obtain a soaked film, and the doping amount of phosphoric acid in the film was 3.8 times. Cut the adhesi...

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Abstract

The invention belongs to the field of electrochemical energy, and provides a high-temperature proton exchange membrane fuel cell and a preparation method thereof. The preparation method comprises the following steps that a catalyst sizing agent with no adhesive is prepared and coats a gas diffusion layer, and drying is performed to obtain an electrode; phosphoric acid treatment is performed on the electrode; a PBI membrane is soaked into a phosphoric acid solution, and a soaking membrane is obtained; the electrode obtained after acid treatment and the soaking membrane form MEA, and the MEA is assembled into a high-temperature proton exchange membrane fuel cell. According to the preparation method of the high-temperature proton exchange membrane fuel cell, on one hand, the electric conductivity and oxygen mass transfer capability of the electrode can be improved with no adhesive; on the other hand, on the basis of phosphoric acid treatment, the electrode can obtain more proton transfer channels so that more reaction interfaces can be built, and then the performance of the cell is improved.

Description

technical field [0001] The invention belongs to the field of electrochemical energy, in particular to a high-temperature proton exchange membrane fuel cell and a preparation method thereof. Background technique [0002] The main feature of high temperature proton exchange membrane fuel cell (HT-PEMFC) is its high operating temperature, generally 100-200 °C. As the working temperature increases, the reaction kinetics accelerates, so the loading of noble metal catalysts can be reduced, and even non-noble metal catalysts can be used, and, with the increase of temperature, the anti-poisoning ability of the catalyst to CO is also gradually enhanced, thus reducing the fuel consumption. Purity requirements are low. The most common electrolyte for HT-PEMFC is polybenzimidazole (PBI) / H 3 PO 4 Membrane, PBI / H 3 PO 4 The membrane uses phosphoric acid as a carrier to conduct protons, so hydration is not required, and the reaction gas does not need to be humidified, which simplifies...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90H01M8/1048
CPCH01M4/8828H01M4/9075H01M8/1048Y02E60/50
Inventor 吴其兴朱晓琳黄雨欣梅日国王芳罗仲宽
Owner SHENZHEN UNIV
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