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Method for measuring porosity of catalyst layer of proton exchange membrane fuel cell

A proton exchange membrane and fuel cell technology, which is applied in measurement devices, battery electrodes, circuits, etc., can solve problems such as large deviation of experimental results, mixing of catalyst layer and substrate pores, and difficulty in separation.

Active Publication Date: 2016-12-07
XUZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method for measuring the porosity of the proton exchange membrane fuel cell in view of the large deviation of the experimental results when measuring the porosity of the catalytic layer of the fuel cell by mercury porosimetry, and the mixing of the catalytic layer and the pores of the substrate, which is difficult to separate. The method of the porosity of the catalytic layer can improve the accuracy of the porosity test of the catalytic layer

Method used

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  • Method for measuring porosity of catalyst layer of proton exchange membrane fuel cell
  • Method for measuring porosity of catalyst layer of proton exchange membrane fuel cell
  • Method for measuring porosity of catalyst layer of proton exchange membrane fuel cell

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Embodiment 1

[0053] see figure 1 , the invention discloses a method for measuring the porosity of a catalytic layer of a proton exchange membrane fuel cell, said method comprising the steps of:

[0054] [Step 1] Use a non-porous, non-compressible and flexible film material as the substrate of the catalytic layer, and use brushing, spraying or printing processes to deposit the catalyst slurry on the film substrate to form a catalytic layer;

[0055] The base material of the catalytic layer is non-porous, non-compressible and has a certain degree of flexibility, and is a polytetrafluoroethylene or polyimide plastic film material, or a thin stainless steel sheet that can be wound; the base material of the catalytic layer requires be able to accurately measure its volume and mass;

[0056] [Step 2] Put the film material into the dilatometer of the mercury porosimeter, measure the pore size distribution of the film material, and calibrate the real volume of the dilatometer;

[0057] The volum...

Embodiment 1

[0071] Example 1: Accurately weigh a certain mass of 40wt.% Pt / C (Johnson Matthey) catalyst, add a mixed solution of absolute ethanol and water (water: absolute ethanol = 1:10 volume ratio), mix well, and then add A certain volume of Nafion (Dupont) solution with a concentration of 5 wt.% was stirred and mixed evenly to obtain a catalyst slurry. Spray the catalyst slurry on 80cm by ultrasonic spraying 2 On the polyimide film, drying, the metal loading of the catalytic layer is 0.4mg Pt / cm 2 , the content of Nafion is 30wt.%. The porosity of the catalytic layer was measured and calculated according to the procedure.

Embodiment 2

[0072] Example 2: Accurately weigh a certain mass of 40wt.% Pt / C (Johnson Matthey) catalyst, add a mixed solution of absolute ethanol and water (water: absolute ethanol = 1:10 volume ratio), mix well, and then add A certain volume of Nafion (Dupont) solution with a concentration of 5 wt.% was stirred and mixed evenly to obtain a catalyst slurry. Spray the catalyst slurry on 80cm by ultrasonic spraying 2 On the PTFE film, drying, the metal loading of the catalytic layer is 0.4mg Pt / cm 2 , the content of Nafion is 30wt.%.

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Abstract

The invention discloses a method for measuring porosity of a catalyst layer of a proton exchange membrane fuel cell. The method comprises the following steps: step 1, taking a nonporous and noncompressible thin film material with certain flexibility as a substrate of the catalyst layer, and depositing catalyst slurry on a thin film substrate to form the catalyst layer; step 2, putting the thin film material into a dilatometer of a mercury injection apparatus, determining pore size distribution of the thin film material, and calibrating the real volume of the dilatometer; step 3, putting the substrate loaded with the catalyst layer into the dilatometer of the mercury injection apparatus, and measuring aperture structure information of the catalyst layer; and step 4, according to the measured data, calculating a volume of the catalyst layer VCL and a mercury filling volume Vpore, and calculating the porosity of the catalyst layer according to a formula described in the specification. The method disclosed by the invention has the advantages that influence of substrate deformation and pore size distribution thereof on the porosity of the catalyst layer can be completely separated, the porosity of the catalyst layer can be rapidly and accurately calculated, practicability and experiment accuracy are good, and accuracy of measuring the porosity of the catalyst layer can be improved.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and relates to a method for measuring the porosity of a catalytic layer, in particular to a method for measuring the porosity of a proton exchange membrane fuel cell catalytic layer. Background technique [0002] Proton exchange membrane fuel cell is a new type of power generation device, which has the advantages of high efficiency and cleanness, simple structure, low start-up temperature, quietness and no noise, etc. It is the preferred power source for electric vehicles, mobile electronic equipment and communication base stations. [0003] The catalytic layer is a key component of a proton exchange membrane fuel cell, where the electrochemical reaction occurs, and is usually composed of a catalyst and a proton-conducting polymer or binder. Catalysts are generally carbon-supported Pt or Pt alloys (such as Pt-Ru), and polymers (such as Nafion) are introduced as proton conductors and binders to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08H01M4/86
CPCG01N15/0893H01M4/8636Y02E60/50
Inventor 赵新生王敏李建伟魏永生
Owner XUZHOU NORMAL UNIVERSITY
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