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Anti-pole-reversal treatment method for membrane electrode in fuel cell stack

A technology of fuel cell stacks and processing methods, which is applied in the direction of fuel cells, battery electrodes, circuits, etc., can solve the problems of high cost and high cost of fuel cell stacks, and achieve the goals of preventing destructive consequences, reducing consumption, and reducing manufacturing costs Effect

Pending Publication Date: 2021-12-03
浙江源神氢电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent provides a layer of electrolytic water catalyst layer to protect the conductive microporous layer when the reverse electrode occurs, but the main components of the electrolytic water catalyst layer are noble metals and their oxides, accounting for more than 50%, which will cause the entire fuel cell The cost of all membrane electrodes of the stack is high, which in turn leads to the high cost of the entire fuel cell stack

Method used

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  • Anti-pole-reversal treatment method for membrane electrode in fuel cell stack
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Examples

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Embodiment 1

[0026] The invention relates to a method for treating the anti-reverse electrode of the membrane electrode in the fuel cell electric stack. The anti-reverse catalyst is added to the platinum carbon catalyst of the membrane electrode to obtain a mixed catalyst, and the mixed catalyst is used as the hydrogen side catalyst of the membrane electrode.

[0027] More specifically, in this example:

[0028] The platinum-carbon catalyst is a commercially available 60% Pt / C catalyst for fuel cells, and an anti-reverse catalyst is added therein and mixed evenly to obtain a mixed catalyst. Among them, the dosing amount of the anti-anti-electrode catalyst is 0.1-10 mg / cm 2 , in this example, mixed with 1mg / cm 2 anti-reverse catalyst; the mass ratio of platinum carbon catalyst to anti-reverse catalyst is 1:1 to 5:1, in this embodiment, it is 2:1; the anti-reverse catalyst can be selected from iridium oxide or ruthenium oxide or two In this embodiment, iridium oxide is selected as the anti...

Embodiment 2

[0032] A treatment method for anti-reversal of membrane electrodes in a fuel cell stack, the difference from Example 1 is that the amount of anti-reversal catalyst incorporated is 2 mg / cm 2 , the mass ratio of the platinum-carbon catalyst to the anti-reverse catalyst is 0.5:1, and ruthenium oxide is selected as the anti-reverse catalyst. The anti-reverse effect of the assembled fuel cell stack is shown in Table 1 below.

Embodiment 3

[0034] A treatment method for anti-reversed poles of membrane electrodes in a fuel cell stack, the difference from Example 1 is that the dosing amount of the anti-reversed catalyst is 1.5mg / cm 2 , the mass ratio of the platinum carbon catalyst to the anti-reverse catalyst is 0.6:1, and a mixture of iridium oxide and ruthenium oxide is used as the anti-reverse catalyst; Replace the single battery with an anti-reverse single battery. The anti-reverse effect of the assembled fuel cell stack is shown in Table 1 below.

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Abstract

The invention relates to an anti-pole-reversal fuel cell stack, in particular to an anti-pole-reversal treatment method for a membrane electrode in a fuel cell stack. An anti-pole-reversal catalyst is added into a platinum-carbon catalyst of the membrane electrode to obtain a mixed catalyst, and the mixed catalyst is used as a hydrogen side catalyst of the membrane electrode. Compared with the prior art, the treatment method has the advantages that the anti-pole-reversal catalyst is uniformly mixed into the platinum-carbon catalyst, the obtained mixed catalyst is used as a catalyst layer on the hydrogen side of the membrane electrode, and the anti-pole-reversal catalyst preferentially acts on electrolyzed water when pole reversal occurs, so that a carbon carrier or a carbon diffusion material on the platinum-carbon catalyst is prevented from being oxidized and damaged, the problems of unrecoverable performance, attenuation and the like after the membrane electrode is reversed are solved, and the normal work, the working efficiency and the reliability and the stability of the system of the fuel cell and the fuel cell stack are ensured.

Description

technical field [0001] The invention relates to a fuel cell electric stack capable of resisting reverse polarity, in particular to a treatment method for anti-reverse polarity of membrane electrodes in the fuel cell electric stack. Background technique [0002] The fuel cell stack is affected by the Bernoulli Effects. If the gas enters and exits the front-end plate at the same time, the membrane electrode of the first bipolar plate of the front-end plate will pass through the bipolar plate due to the small pressure difference. The gas flow rate of the two end plates is less, and it is easy to form a blockage, thereby generating a reverse electrode. If the gas enters the front end plate and exits the rear end plate, the membrane electrodes of the front and rear end plates will pass through the bipolar plate due to the small pressure difference. The gas flow rate is reduced, forming a blockage, resulting in a reverse pole. Once the fuel cell stack reverses, the potential of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/92H01M8/1004H01M4/88
CPCH01M4/9016H01M4/926H01M4/8828H01M8/1004Y02E60/50
Inventor 胡里清
Owner 浙江源神氢电科技有限公司
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