Method for rapidly activating proton exchange membrane fuel cell

A proton exchange membrane and fuel cell technology, applied in fuel cells, electrochemical generators, circuits, etc., can solve the problems of occupying production resources, troubles in the practical application of fuel cells, and time-consuming use, and achieve simple and convenient operation and activation effect significant effect

Inactive Publication Date: 2021-05-28
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional activation methods include constant current activation, constant voltage activation, frequency conversion activation, etc. Using the traditional activation process takes at least one hour and as many as ten hours. For enterprises preparing fuel cells, the production efficiency is reduced. Occupies production resources; for fuel cell users, it consumes its use time and causes great troubles to the practical application of fuel cells. Activation is an unavoidable problem in the production and use of fuel cells

Method used

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  • Method for rapidly activating proton exchange membrane fuel cell
  • Method for rapidly activating proton exchange membrane fuel cell
  • Method for rapidly activating proton exchange membrane fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Check the assembled proton exchange membrane fuel cell for leaks to see if there is any air leakage in the connecting part, and if there is any air leakage, it needs to be solved; The battery is subjected to a constant temperature of 75°C, and the battery is purged with nitrogen before the battery is filled with hydrogen to remove impurity gases in the flow channel. After purging for a certain period of time, switch to the hydrogen-air mode to supply the normal power generation of the fuel cell, in which the anode back pressure is 150kPa, the anode humidity is 50%, the cathode back pressure is 130kPa, the cathode humidity is 70%, and the anode / cathode excess coefficient is 2.0 / 2.0 to ensure the fuel gas Sufficient supply, and at 100mA / cm 2 Apply current to the interval until the current density reaches 1500mA / cm 2 , remain stable for a while at this current density.

[0025] When the battery is running stably at this current density, the air supply on the cathode side...

Embodiment 2

[0029] Check the assembled proton exchange membrane fuel cell for leaks to see if there is any air leakage in the connecting part, and if there is any air leakage, it needs to be solved; The battery is subjected to a constant temperature of 75°C, and the battery is purged with nitrogen before the battery is filled with hydrogen to remove impurity gases in the flow channel. After purging for a certain period of time, switch to the hydrogen-air mode to supply the normal power generation of the fuel cell. The anode back pressure is 150kPa, the anode humidity is 50%, the cathode back pressure is 150kPa, the cathode humidity is 70%, and the anode / cathode excess coefficient is 2.0 / 2.0 to ensure fuel gas Sufficient supply, and at 100mA / cm 2 Apply current to the interval until the current density reaches 1000mA / cm 2 , remain stable for a while at this current density.

[0030] When the battery is running stably at this current density, the air supply on the cathode side is switched ...

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Abstract

The invention discloses a method for rapidly activating a proton exchange membrane fuel cell. The method comprises the following specific steps that: (1) the proton exchange membrane fuel cell is made to operate at specified high current density according to conventional operation conditions, and the proton exchange membrane fuel cell is made to be stable, the current density is 500-1500mA / cm <2>; 2) air supply on the cathode side of the proton exchange membrane fuel cell is switched into nitrogen supply, and such kind of condition is maintained for 100-300s; and 3) the nitrogen supply is switched back to the air supply, and rapid activation of the proton exchange membrane fuel cell is completed after the voltage is stable. Compared with traditional activation operation, the method can complete the activation process in several minutes under the condition of activating to the same performance, so that the activation efficiency of the fuel cell is effectively improved, and the rapid activation of the proton exchange membrane fuel cell is realized; and meanwhile, in the activation process, the single cell does not need to be disassembled, assembled, restarted and the like, the whole operation process is simple, and the cell is not damaged.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, in particular to a method for rapid activation of a proton exchange membrane fuel cell. Background technique [0002] Proton exchange membrane fuel cell is an energy conversion device that can directly convert the chemical energy of hydrogen into electrical energy. It has broad development prospects due to its wide source of raw materials, cleanliness and pollution-free. Generally speaking, the performance of newly shipped batteries and batteries that have been left unused for a long time is not optimal, and a long period of activation is required before official use to make the performance reach an optimal state. There are many reasons why the initial performance of the fuel cell cannot be optimal, among which the oxides formed by the catalyst and other impurity elements cause the reduction of the surface active area of ​​the catalyst. The purpose of the activation step is to increase the ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/04223H01M8/04089
CPCH01M8/04089H01M8/04223Y02E60/50Y02P70/50
Inventor 郭伟苏航潘牧
Owner WUHAN UNIV OF TECH
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