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Method for preparing and testing ion-polluted Nafion film based on fuel cell catalyst layer

A technology for ionic pollution and fuel cells, which is used in electrochemical variables of materials, preparation of samples for testing, measurement devices, etc.

Pending Publication Date: 2020-11-20
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] There is currently no method to study the effect of contamination of ionic polymers in the catalytic layer of platinum alloy catalysts in proton exchange membrane fuel cells on their proton conductivity.

Method used

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  • Method for preparing and testing ion-polluted Nafion film based on fuel cell catalyst layer
  • Method for preparing and testing ion-polluted Nafion film based on fuel cell catalyst layer
  • Method for preparing and testing ion-polluted Nafion film based on fuel cell catalyst layer

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Experimental program
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Effect test

Embodiment 1

[0044] A kind of preparation and testing method of ion pollution Nafion film based on fuel cell catalytic layer, comprises the steps:

[0045] S1, with equivalent mass (EW) 1000, concentration is the commercial Nafion solution of 20wt.%, dilutes to 0.5wt.% through isopropanol, ultrasonic 5 minutes, makes the ionic micelles in the solution evenly disperse in the solution, then stand still for 24 hours;

[0046] S2. Ultrasonic cleaning the interdigital electrodes with acetone, methanol, and isopropanol for 10 minutes respectively, and then ultrasonic cleaning with ultrapure water for 10 minutes, and drying;

[0047] S3, put the interdigitated electrode into a Nafion solution with a mass fraction of 0.5wt.%, so that the solution does not cover the surface of the electrode, take it out after standing still for 24 hours, and dry it with nitrogen;

[0048] S4, put the dried interdigitated electrode into a 60°C oven to fully volatilize the organic solvent in the film;

[0049]The t...

Embodiment 2

[0057] A kind of preparation and testing method of the ion pollution Nafion thin film based on fuel cell catalytic layer, comprises the steps: the difference with embodiment 1 is that the concentration of Nafion solution is changed into 1wt.%, keep other implementation conditions constant, can Prepare a Nafion film with a thickness of 120nm, and the degree of contamination of the film obtained after ion exchange is as follows: figure 2 shown in .

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Abstract

The invention discloses a method for preparing and testing an ion-polluted Nafion film based on a fuel cell catalyst layer, and relates to the field of fuel cell testing. The Nafion solution with theconcentration smaller than 2 wt.% is self-assembled on an interdigital electrode with silicon as a substrate for 12-48 h, taken out, dried in the air and then soaked in an ion exchange solution of nitric acid and cobalt nitrate for 24 h or longer, and the ion-polluted Nafion thin film is obtained. Films with different pollution degrees are obtained by adjusting the solution ratio; and the conductivity change of the Nafion films with different pollution degrees is obtained by using an electrochemical method of an alternating current impedance spectrum. The influence of ionomer pollution causedby catalyst attenuation on proton conduction in the battery is reflected by testing the change of proton conductivity of the films with different pollution degrees. And the relationship is establishedamong the ion exchange solution ratio, the film pollution degree and the film conductivity. The pollution degree of the Nafion ionomer in the battery can be conveniently deduced through the conductivity test result of the battery protons. And development of related research on the attenuation mechanism of the battery after long-time operation is facilitated.

Description

technical field [0001] The invention relates to the technical field of fuel cell testing, in particular to a method for preparing and testing an ion-contaminated Nafion film on a catalytic layer of a fuel cell. Background technique [0002] Proton Exchange Membrane Fuel Cell (PEMFC) is a kind of fuel cell, which is equivalent to the "reverse" device of water electrolysis in principle. Its single cell is composed of anode, cathode and proton exchange membrane. The anode is the place where the hydrogen fuel is oxidized, and the cathode is the place where the oxidant is reduced. Both electrodes contain catalysts that accelerate the electrochemical reaction of the electrodes. [0003] The relatively mature platinum-carbon catalysts cannot be compared with traditional batteries due to their higher consumption of platinum precious metals. The current research on platinum alloy catalysts shows that they can greatly reduce the platinum and precious metals while keeping the catalytic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N27/04G01N27/62G01N27/26
CPCG01N1/28G01N27/041G01N27/62G01N27/26
Inventor 章俊良韩爱娣闫晓晖陈俊任程晓静柯长春沈水云
Owner SHANGHAI JIAO TONG UNIV
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