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Covalent organic framework material used in fuel cell self-humidifying membrane electrode and preparation method thereof

A covalent organic framework, fuel cell technology, applied in the direction of fuel cells, battery electrodes, circuits, etc., can solve the problems of unfavorable battery performance and durability, complicated preparation process, unstable catalyst, etc., and achieve excellent performance and preparation method. Simple, performance-enhancing effects

Active Publication Date: 2022-06-21
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this patent, due to the use of two different catalysts, the preparation process will be complicated, and the Fe-N / S / C catalyst is unstable, and it is bound to decompose over time, which will adversely affect battery performance and durability

Method used

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  • Covalent organic framework material used in fuel cell self-humidifying membrane electrode and preparation method thereof
  • Covalent organic framework material used in fuel cell self-humidifying membrane electrode and preparation method thereof
  • Covalent organic framework material used in fuel cell self-humidifying membrane electrode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A preparation method of a covalent organic framework material for a self-humidifying membrane electrode of a fuel cell, comprising the following steps:

[0044] (1) Preparation of Anode Hydrophilic Catalytic Layer

[0045] According to the mass ratio of 6.5:3:0.5:500, 2 mg of Pt / C catalyst (40wt.%, JohnsonMatthey), 18.5 mg of Nafion solution (5wt.%, DuPont), and 0.16 mg of phosphoric acid-loaded covalent organic framework were weighed , 20ml of isopropanol, ultrasonically oscillated for 30 minutes, sprayed on one side of the proton exchange membrane, and dried in an oven at 75 °C for 2h to obtain an anode hydrophilic catalytic layer, in which the Pt load is 0.1 mg / cm 2 , the amount of covalent organic framework loaded with phosphoric acid was 5wt.%.

[0046] (2) Preparation of Cathode Catalytic Layer

[0047] According to the mass ratio of 7:3:500, 4 mg of Pt / C catalyst (40wt.%, Johnson Matthey), 34.3 mg of Nafion solution (5wt.%, DuPont), and 20 ml of isopropanol wer...

Embodiment 2

[0052] The addition amount of the covalent organic framework loaded with phosphoric acid was changed to 10 wt.%, and the rest of the experimental steps and assembly test conditions were the same as those in Example 1.

[0053] Test results such as figure 1 , it was found that the highest power density of the battery reached 452mW / cm at 38% relative humidity 2 ,0.4V current density reaches 1100mA / cm 2 .

Embodiment 3

[0055] The addition amount of the covalent organic framework loaded with phosphoric acid was changed to 20 wt.%, and the rest of the experimental steps and assembly test conditions were the same as those in Example 1.

[0056] The highest power density of the battery reaches 441mW / cm at 38% relative humidity 2 ,0.4V current density up to 1000mA / cm 2 .

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Abstract

The invention belongs to the field of fuel cell technology, relates to a low-temperature membrane fuel cell, in particular to a covalent organic framework material used for a self-humidifying membrane electrode of a fuel cell, at least including a gas diffusion layer, a catalytic layer and a proton exchange membrane, on one side of the proton exchange membrane A catalytic layer is provided with a covalent organic framework material doped with phosphoric acid, the other side is provided with a catalytic layer containing a Pt catalyst, and the gas diffusion layer is attached to the surface of the catalytic layer and solidified by hot pressing; wherein, the gas diffusion The layer is porous fiber carbon paper or carbon cloth with a thickness of 0.10-0.37 mm and a porosity of 50-80%; the catalytic layer includes a catalytic layer binder and platinum black, carbon-supported platinum or carbon-supported platinum alloy catalyst Any one; the proton exchange membrane is a high molecular polymer membrane with a thickness of 5-150 μm. The preparation method of the invention is simple, and the prepared self-humidifying membrane electrode has excellent performance and good stability under low humidity conditions, simplifies the preparation of the membrane electrode, and improves the performance of the battery under high humidity.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, relates to a low-temperature membrane fuel cell, and in particular relates to a covalent organic framework material used for a self-humidifying membrane electrode of a fuel cell and a preparation method thereof. Background technique [0002] In today's increasingly tense global fossil energy and increasingly serious environmental problems, the research on hydrogen energy and fuel cell technology has received great attention worldwide. As the latest generation of fuel cells, polyelectrolyte membrane fuel cells (PEMFCs) have the advantages of high specific energy, low operating temperature, environmental friendliness, fast start-up at room temperature, and long life. They are ideal power sources for mobile and portable devices. Broad application prospects. [0003] PEMFC is an energy conversion device that converts chemical energy stored in fuel directly into electrical energy. Unlike a heat e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/92H01M8/1004
CPCH01M4/926H01M8/1004Y02E60/50
Inventor 苏华能解政张玮琦徐谦
Owner JIANGSU UNIV