Device and method for testing electric conductivity of powder material and impedance of membrane electrode

A technology for testing devices and powder materials, applied in the direction of measuring resistance/reactance/impedance, measuring devices, measuring electrical variables, etc., can solve the problems of reducing the contact resistance between the compact and the wire, high test cost, high test accuracy, etc., to achieve Inexpensive, easy to master, and simple to test for effects

Active Publication Date: 2013-06-12
UNIV OF SCI & TECH BEIJING
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  • Abstract
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Problems solved by technology

In the results published in the "Journal of East China University of Science and Technology", Qin Changyong et al. added ATO powder into the cavity of the tablet press and formed it under a certain pressure to obtain a compact. Then, the resistance value at both ends of the compact was measured by a multimeter, and the powder Bulk conductivity, this method is easy to operate, but the error is large, and the ionic conductivity of the mixed charged powder material cannot be measured; Chen Weizhong et al. in their invention patent (application number: 200810216653. The tablet press was compacted, and the test device was connected after the metal powder was coated on both sides of the compact. The electronic and ion conductivity of the mixed charged powder material was obtained by the DC shunt method and the AC impedance method. The metal powder reduced the compaction. The contact resistance with the wire, this method has high test accuracy, but it cannot measure the electronic

Method used

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  • Device and method for testing electric conductivity of powder material and impedance of membrane electrode
  • Device and method for testing electric conductivity of powder material and impedance of membrane electrode
  • Device and method for testing electric conductivity of powder material and impedance of membrane electrode

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0039] Example 1

[0040] Grind the electronically conductive ATO powder material, use a 200-mesh sieve to obtain a certain particle size powder conductive material, weigh 0.5 g and place it in a vacuum drying oven at 80°C for 12 h, and then press.

[0041] Then, the dried ATO powder material was placed in a commercial briquetting machine to prepare briquettes, the diameter of the briquette was 10 mm, and the thickness of the briquette was measured by a vernier caliper.

[0042] Take out the briquette and press the porous stainless steel mesh-briquette 7-stainless steel mesh figure 2 After assembly, obtain the tested sample of the sandwich structure. Such as Figure 1a As shown, it is placed in the sample chamber composed of the upper pressure rod 1, the base 10 and the temperature control sleeve 4, and the pressure block 7 is compressed by the upper fastening screw 2 and the lower fastening screw 11. Each screw The torque is 1 N m.

[0043] The test temperature of the sample chamb...

Example Embodiment

[0047] Example 2

[0048] The test material is replaced by ATO-SnP, which has both electronic and proton conductivity. 2 O 7 Mix the charged powder materials, grind the powder materials, use a 200-mesh sieve to obtain powder materials with a certain particle size, weigh 0.5 g and place them in a vacuum drying oven at 80 ℃ to dry for 12 h, and wait for compaction.

[0049] The dried ATO-SnP 2 O 7 The powder material is placed in a commercial briquetting machine to prepare briquettes, the diameter of the briquette is 10 mm, and the thickness of the briquette is measured by a vernier caliper.

[0050] Take out the briquette and press the porous stainless steel mesh-briquette-stainless steel mesh figure 2 After assembly, obtain the tested sample of the sandwich structure. Such as Figure 1a As shown, it is placed in the sample chamber composed of the upper pressure rod 1, the base 10 and the temperature control sleeve 4, and the pressure block 7 is compressed by the upper fastening scr...

Example Embodiment

[0059] Example 3

[0060] The catalyst used in this example is IrO 2 / ATO, IrO 2 / Cs 1.5 HWA-ATO prepares membrane electrode, the specific method is as follows:

[0061] First, the above-mentioned catalyst and 5% PTFE emulsion are mixed in a certain volume of isopropanol according to a certain ratio, and the spray slurry is obtained after hundreds of times of ice bath ultrasonication. Then, the PTFE film is used as the matrix to prepare the catalytic layer by heating spray method. As attached image 3 Finally, the PTFE film with the anode catalytic layer 142, the Nafion film 143, and the PTFE film with the cathode catalytic layer 144 are placed at a pressure of 750 N cm -2 Under the temperature of 135 ℃, hot press to peel off the PTFE film to obtain the membrane electrode under test. Among them, MEA-1 and MEA-2 are IrO respectively 2 / ATO and IrO 2 / Cs 1.5 Membrane electrode prepared by HWA-ATO two catalysts.

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Abstract

The invention provides a device and a method for testing the electric conductivity of a powder material and the impedance of a membrane electrode, which can meet two measurement modes: a powder material electric conductivity measurement mode and a membrane electrode impedance measurement mode. The powder material electric conductivity measurement mode comprises the steps of putting a testing sample of prepared powder press cake in a sample testing cell, testing by using an assembled die, obtaining the total impedance and electron impedance of powder respectively, obtaining proton impedance by combining an impedance parallel-connection formula and calculating to obtain electron conductivity, proton conductivity and total conductivity; and the membrane electrode impedance measurement mode comprises the steps of putting a testing sample of the prepared membrane electrode in the sample testing cell, testing by using the assembled die and obtaining the impedance of a membrane electrode. The testing device is provided with a temperature control sleeve and a humidifying pipeline, so that the electric conductivity of the powder material and the impedance of the membrane electrode under different temperature and humidity can be tested. The testing device is simple in equipment, easy to operate and precise in measurement result; meanwhile, the testing device is applicable for testing the electric conductivity of a mixed charged powder material and the impedance of the membrane electrode in a simulative PEM (Polymer Electrolyte Membrane) electrolytic tank environment; and therefore, the feasibility, the necessity and the importance of the device are further highlighted.

Description

technical field [0001] The invention relates to a method for testing material properties method , especially involving the relationship between the conductivity of a powder material and the impedance of the membrane electrode Test device and method . Background technique [0002] At present, mixed charged powder materials with both electron and proton conductivity, because they can significantly optimize the electron and proton channel transport capabilities of proton exchange membrane fuel cells and water electrolysis cell membrane electrodes, and then improve the interface reaction characteristics, have been widely studied by many researchers. Used for catalytic layer modification materials and catalyst carrier materials. Among them, the measurement of the electronic and proton conductivity properties of powder materials is an indispensable physical parameter in the process of evaluating the application of powder materials. Therefore, it is extremely critical to optimi...

Claims

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Application Information

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IPC IPC(8): G01R27/02
Inventor 王新东刘高阳许军元刘桂成蒋钜明王一拓彭冰霜
Owner UNIV OF SCI & TECH BEIJING
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