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Activation method of proton exchange membrane fuel cell

A proton exchange membrane and activation method technology, applied in the field of activation of proton exchange membrane fuel cells, can solve the problems of low output power density, unutilized fuel, unfavorable electrode reaction, etc., to improve chemical stability, save fuel, reduce Dissolution effect

Active Publication Date: 2020-11-10
FAW JIEFANG AUTOMOTIVE CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Existing activation methods usually use a single current density or a single voltage for activation. Although the activation time is shortened, the activation is not complete, which is not conducive to the thorough progress of the electrode reaction, resulting in low output power density, and at the same time, the fuel is not properly charged. use, waste resources

Method used

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  • Activation method of proton exchange membrane fuel cell
  • Activation method of proton exchange membrane fuel cell
  • Activation method of proton exchange membrane fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A kind of activation method of proton exchange membrane fuel cell is provided in the present embodiment, comprises the following steps:

[0044] 1) Make the active area 25cm 2 The CCM is assembled into a single cell, the anode is fed with hydrogen, the stoichiometric ratio is 1.1, and no humidification is used; the cathode is fed with 100% humidified nitrogen, and the stoichiometric ratio is 2.0. LSV test is carried out after 45 minutes, the voltage scanning range is 0.1-0.6V, the scanning speed is 2mV / s, and the preset value of the hydrogen permeation current in the LSV test curve is 2mA / cm 2 .

[0045] 2) When the tested hydrogen permeation current value is greater than the preset value of the current density, disconnect the gas source, switch the cathode gas to oxygen, the stoichiometric ratio is 2.0, and the stoichiometric ratio of pure hydrogen at the anode is 1.1.

[0046] 3) Set the gradient output voltage, the first step is 0.85V, the activation time is 3min, ...

Embodiment 2

[0050] A kind of activation method of proton exchange membrane fuel cell is provided in the present embodiment, comprises the following steps:

[0051] 1) Make the active area 25cm 2 The CCM is assembled into a single cell, the anode is fed with hydrogen, the stoichiometric ratio is 1.5, no humidification is used, the cathode is fed with 100% humidified nitrogen, and the stoichiometric ratio is 2.0. LSV test is carried out after 120 minutes, the voltage scanning range is 0.1-0.6V, the scanning speed is 10mV / s, and the preset value of the hydrogen permeation current in the LSV test curve is 5mA / cm 2 .

[0052] 2) The cathode gas is switched to air, the stoichiometric ratio of air is 2.0, and the stoichiometric ratio of pure hydrogen at the anode is 1.5.

[0053] 3) Set the gradient output voltage, the first step is 0.85V, the activation time is 5min, cycle 2 times, the second step is 0.6V, the activation time is 30min, cycle 4 times, the third step is 0.5V, the activation tim...

Embodiment 3

[0057] A kind of activation method of proton exchange membrane fuel cell is provided in the present embodiment, comprises the following steps:

[0058] 1) Make the active area 25cm 2 The CCM is assembled into a single cell, the anode is fed with hydrogen, the stoichiometric ratio is 1.5, and the cathode is fed with 100% humidified nitrogen, and the stoichiometric ratio is 2.0. When the battery operating temperature reaches 75 ° C, the cathode and anode gas are fed for 100 minutes before LSV Test, the voltage scanning range is 0.1-0.6V, the scanning speed is 5mV / s, and the preset value of the hydrogen permeation current in the LSV test curve is 4mA / cm 2 .

[0059] 2) The cathode gas is switched to oxygen, the stoichiometric ratio is 2.0, and the stoichiometric ratio of pure hydrogen at the anode is 1.5.

[0060] 3) Set the gradient output voltage, the first step is 0.85V, the activation time is 4min, cycle 3 times, the second step is 0.6V, the activation time is 25min, cycle ...

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Abstract

The invention relates to an activation method of a proton exchange membrane fuel cell, and the method comprises the following steps: (1) introducing hydrogen into an anode and introducing nitrogen into a cathode of an assembled cell, carrying out LSV test, and disconnecting a gas source when the tested hydrogen permeation current value is greater than the preset value of the current density; (2) switching the cathode gas into oxygen or air, maintaining the stoichiometric ratio of the cathode gas to be 2 and the stoichiometric ratio of the anode gas to be 1.1-1.5, carrying out activation treatment, then carrying out polarization curve test, and if polarization curves are superposed twice continuously after activation, finishing activation, wherein the activation treatment comprises three-step constant-voltage activation treatment which is carried out in sequence. According to the method provided by the invention, due to the introduction of the hydrogen permeation current testing process, three interfaces, namely the catalyst, the electrolyte and the Nafion, in the battery can reach the optimal balance state, the activation time is shortened, the chemical stability of a proton membrane in the battery can be greatly improved, and the service life of the battery is prolonged.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to an activation method for a proton exchange membrane fuel cell. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is considered to be one of the best green energy sources in the 20th century due to its advantages of high energy conversion efficiency, fast start-up at low temperature, no pollution, good durability, and high specific power. . The membrane electrode (Membrane Electrode Assembly, MEA) is the core component of the fuel cell. The membrane electrode includes an anode gas diffusion layer, an anode frame, an anode catalyst layer, a proton membrane, a cathode catalyst layer, a cathode frame, and a cathode gas diffusion layer. Membrane electrode is the site of heterogeneous material transport and electrochemical reaction, which determines the performance, life and cost of proton exchange membrane fuel cells. A high-performance battery should have smooth hyd...

Claims

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Application Information

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IPC IPC(8): H01M8/04223H01M8/04537
CPCH01M8/04223H01M8/04582Y02E60/50
Inventor 于力娜朱雅男唐柳张克金杨帅
Owner FAW JIEFANG AUTOMOTIVE CO
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