Unlock instant, AI-driven research and patent intelligence for your innovation.

Hydrophobicity regulation and control method of alkaline polyelectrolyte fuel cell catalyst layer

A polyelectrolyte and fuel cell technology, applied in the field of electrochemical devices, can solve the problems of not effectively improving the performance of APEFC, reducing the commercial feasibility of APEFC, and not being able to precisely control the hydrophobicity of the reaction interface, so as to improve water management and realize Stable operation and reduced mass transfer resistance

Inactive Publication Date: 2020-10-02
WUHAN UNIV
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although typical hydrophobic materials such as polytetrafluoroethylene (PTFE) polymers can increase the hydrophobicity of the catalytic layer, PTFE-based polymers are usually difficult to uniformly disperse and their addition will additionally increase the composition of the catalytic layer. Most importantly, the The introduction of hydrophobicity that cannot precisely control the reaction interface
Therefore, although the introduction of such materials can improve the hydrophobicity of the catalytic layer, it cannot effectively improve the performance of APEFC.
[0005] Although the water management problem of APEFC can also be improved by increasing the air flow at the air inlet, this method will greatly waste fuel and reduce the feasibility of commercialization of APEFC

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Hydrophobicity regulation and control method of alkaline polyelectrolyte fuel cell catalyst layer
  • Hydrophobicity regulation and control method of alkaline polyelectrolyte fuel cell catalyst layer
  • Hydrophobicity regulation and control method of alkaline polyelectrolyte fuel cell catalyst layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Weigh 10 mg of hydrophobic polyelectrolyte QAPAFs ( figure 2 Any structure in), it is dissolved in the organic solvent of 5mL, prepares the hydrophobic polyelectrolyte of 20mg / mL, the polyelectrolyte of reference example (commercialized quaternized aryl copolymer (QAPPT), Yi Wei Company purchased) to prepare membrane solutions with the same concentration. The two polyelectrolyte solutions are mixed according to a volume ratio of 1:1 to 1:0 to obtain polyelectrolyte membrane solutions with different hydrophobicities. Weigh 9 mg of commercial 40% Pt / C into a 25 ml glass bottle, add 2 ml of low boiling point solvent for uniform dispersion, and then take 113 μL of the mixed polyelectrolyte solution and add it to the ink. Under the condition of lower than 25°C, ultrasonication was performed for 30 minutes to make it evenly mixed to obtain catalyst ink, which was set aside. Spray the prepared catalyst ink evenly on the alkaline film with a spray gun, heat the film during t...

Embodiment 2

[0044] Weigh 10 mg of hydrophobic polyelectrolyte QAPAFs ( figure 2 Any structure in ) was dissolved in 5mL of organic solvent to prepare a 20mg / mL hydrophobic polyelectrolyte, and the polyelectrolyte of the reference example was prepared into a membrane solution with the same concentration. The two polyelectrolyte solutions are mixed according to a volume ratio of 1:1 to 1:0 to obtain polyelectrolyte membrane solutions with different hydrophobicities. Weigh 6 mg of commercial 60% Pt / C into a 25 ml glass bottle, add 2 ml of low boiling point solvent for uniform dispersion, and then take 75 μL of the mixed polyelectrolyte solution and add it to the ink. Under the condition of lower than 25°C, ultrasonication was performed for 30 minutes to make it evenly mixed to obtain catalyst ink, which was set aside. Spray the configured ink evenly on the alkaline film with a spray gun, heat the film during the spraying process, and evenly volatilize the solvent. A catalytic layer with p...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a hydrophobicity regulation and control method of an alkaline polyelectrolyte fuel cell catalyst layer. The method comprises the following steps of firstly, synthesizing a series of fluorine-containing alkaline polyelectrolytes, and dissolving and dispersing the fluorine-containing alkaline polyelectrolytes in an organic solvent (such as dimethyl sulfoxide) to prepare a polymer solution with a certain concentration; then adding the hydrophobic polymer solution and the common polymer solution into the catalyst dispersion solution according to different volume ratios (thehydrophobic polymer solution can be completely used), and carrying out uniform ultrasonic dispersion to prepare catalyst ink; finally, spraying uniformly dispersed catalyst ink on the alkaline membrane, removing the solvent by heating in the spraying process, and placing the alkaline membrane with the catalyst layer between the gas diffusion layers to form a membrane electrode. The method is characterized in that the hydrophilicity and hydrophobicity of the catalyst layer can be adjusted by adding the hydrophobic polymer solution in proportion, the hydrophobic polyelectrolyte is located in athree-phase reaction interface, and the hydrophilicity and hydrophobicity of reaction active sites of the catalyst layer can be accurately adjusted and controlled without introducing the extra electrode components.

Description

technical field [0001] The invention belongs to the field of electrochemical devices and relates to a method for regulating and controlling the hydrophobicity of membrane electrodes. Specifically, it is a method for regulating the hydrophobicity of the catalytic layer of an alkaline polyelectrolyte fuel cell. The invention precisely regulates the hydrophobicity of the catalytic layer by introducing a class of hydrophobic fluorine-containing alkaline polyelectrolytes (QAPAFs). Background technique [0002] Alkaline polyelectrolyte fuel cells (APEFC) have attracted extensive attention from researchers because of their advantages such as high energy conversion efficiency, low noise and less pollution, and alkaline working environment. During the operation of APEFC, the oxygen reduction reaction at the cathode of the battery consumes water to produce hydroxide ions (OH - ),OH - It is conducted to the anode through the alkaline membrane, and the anode of the battery undergoes a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01M4/88H01M4/90
CPCH01M4/8828H01M4/8878H01M4/90H01M4/9008Y02E60/50
Inventor 庄林胡梅雪
Owner WUHAN UNIV