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Start-stop method of high-temperature proton exchange membrane fuel cell

A proton exchange membrane, fuel cell technology, applied in fuel cells, circuits, electrical components, etc., can solve problems such as difficult nitrogen gas sources, and achieve the effect of alleviating the problem of cathode carbon corrosion

Active Publication Date: 2020-06-09
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these strategies also have certain limitations. For example, the auxiliary load strategy needs to consider how to safely and effectively connect the auxiliary load in the fuel cell system; nitrogen purging can effectively prevent the formation of the hydrogen-air interface, but for practical applications, nitrogen purging Sweeping is difficult to achieve simply by carrying a nitrogen gas source

Method used

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  • Start-stop method of high-temperature proton exchange membrane fuel cell
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  • Start-stop method of high-temperature proton exchange membrane fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Experiments were carried out using a high-temperature proton exchange membrane fuel cell based on a phosphoric acid-doped poly(4,4'-diphenyl ether-5,5'-dibenzimidazole) high-temperature electrolyte membrane. The anode of the battery is a gas diffusion electrode loaded with 60% Pt / C electrocatalyst, and the cathode is a gas diffusion electrode loaded with a metal atomic ratio of 1:3 PtCr / C electrocatalyst.

[0019] Start-up operation: After the temperature of the fuel cell rises to 70°C, the anode is fed with H 2 , the feed rate corresponds to 200mA / cm 2 The stoichiometric ratio is 1.3 times. After 20s, the cathode is fed with air. When the temperature rises to 105°C, the current is applied for discharge. After the temperature rises to 160°C, the current is discharged at 200mA / cm 2 Next discharge test.

[0020] Shutdown operation: reduce the discharge current density to 150mA / cm 2 , at this time, the discharge voltage of the single cell is 0.7V. As the temperature dec...

Embodiment 2

[0023] Experiments were carried out using a high-temperature proton exchange membrane fuel cell based on a phosphoric acid-doped poly(2,5-benzimidazole) high-temperature electrolyte membrane. The anode of the battery is a gas diffusion electrode loaded with PtNi / C electrocatalyst, and the cathode is a gas diffusion electrode loaded with PtCr / C electrocatalyst.

[0024] Start-up operation: After the temperature of the fuel cell rises to 90°C, the anode is fed with H 2 and CO mixed gas, where the volume content of CO is 1%, and the feed amount corresponds to 200mA / cm 2 The stoichiometric ratio is 1.5 times, after 30s, the cathode is fed with air, when the temperature rises to 110°C, the current is applied to discharge, and when the temperature rises to 160°C, the discharge starts at 300mA / cm 2 Next discharge test.

[0025] Shutdown operation: reduce the discharge current density to 100mA / cm 2 At this time, the average discharge voltage of a single battery is 0.73V. As the tem...

Embodiment 3

[0028] Experiments were carried out using a high-temperature proton exchange membrane fuel cell based on a phosphoric acid-doped poly(2,2'-m-tolyl-5,5'-bibenzimidazole) high-temperature electrolyte membrane. The anode of the battery is a gas diffusion electrode loaded with PtRu / C electrocatalyst, and the cathode is a gas diffusion electrode loaded with PtW / C electrocatalyst.

[0029] Start-up operation: After the temperature of the fuel cell rises to 100°C, the anode is fed with H 2and CO mixed gas, where the volume content of CO is 10%, and the feed amount corresponds to 200mA / cm 2 The stoichiometric ratio is 1.7 times, after 10s, the cathode is fed with air, and when the temperature rises to 125°C, the current is applied to discharge, and when the temperature rises to 160°C, the discharge starts at 300mA / cm 2 Next discharge test.

[0030] Shutdown operation: reduce the discharge current density to 200mA / cm 2 At this time, the average discharge voltage of a single battery ...

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Abstract

The mixed gas of CO and H2 is used for feeding in the start-stop process, and the competitive adsorption characteristic of CO and H2 on the surface of Pt is utilized to lower the anode hydrogen oxidation amount in the start-stop process, thereby lowering the cathode carbon corrosion amount in the start-stop process. The start-stop strategy provided by the invention is more suitable for a high-temperature proton exchange membrane fuel cell, and by utilizing the strategy, the problem of cathode carbon corrosion in the start-stop process can be effectively relieved, the service life of the fuel cell is prolonged to a greater extent, and the durability of the fuel cell is improved.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a start-stop strategy for a high-temperature proton exchange membrane fuel cell. Background technique [0002] High-temperature proton exchange membrane fuel cell (HT-PEMFC, 150-200°C) has faster electrode reaction rate than low-temperature proton exchange membrane fuel cell (PEMFC, around 80°C), higher tolerance to impurities and better hydrothermal management Simple, etc., so high-temperature proton exchange membrane fuel cells have received widespread attention. Proton exchange membrane fuel cells have outstanding advantages such as high energy conversion efficiency and environmental friendliness, and also have the characteristics of high specific power and specific energy. They are very promising vehicle power sources and power sources. [0003] Fuel cell vehicle power supply and power supply inevitably experience various working conditions, such as frequent start and sto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/04225H01M8/04228H01M8/04302H01M8/04303
CPCH01M2008/1095H01M8/04225H01M8/04228H01M8/04302H01M8/04303Y02E60/50
Inventor 孙海李印华杨林林赵世雄孙公权
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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