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Catalysed membrane

An electrocatalyst and ion-conducting membrane technology, applied in the field of catalytic ion-conducting membranes, can solve the problems of not showing high performance, low permeability, etc.

Active Publication Date: 2022-02-22
JOHNSON MATTHEY HYDROGEN TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such electrocatalyst layers may not exhibit high performance when air is supplied as the oxidant, i.e. under realistic conditions, for example, due to the high density and low permeability of the electrocatalyst layer.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0115] Preparation of layer A ink

[0116] Layer A ink was made by mixing 2 g of carbon powder with 7.07 g of aqueous Solvay 830EW ionomer solution (Aquivion, 25% by weight) using a spatula to ensure complete wetting of the carbon powder. 2.85 g of pure propan-1-ol and 4.82 g of water were added to the mixture to achieve a 22% by weight propan-1-ol / water ratio in the solvent mixture and stirred well. The ionomer content in the carbon ink was 90% by weight relative to the weight of carbon. in a 5mm diameter with ten Beads Speedmixer TM Process the mixture in a DAC 150FVZ-K until optimum grain breakdown is achieved. Stop the ink treatment and stir after 5 minutes to avoid overheating of the ink during treatment.

[0117] Two different Layer A inks were prepared, each ink containing a different carbon. As described in WO2013 / 045894, the layer A1 (LA1) ink contains carbon specifically designed for use in fuel cells. Layer A2 (LA2) ink contained Ketjen EC-300J.

[0118] ...

Embodiment 5

[0182] Example 5 corresponds to Comparative Example 3, with layer A added. The performance of Example 5 in air at high current density is better than that of Comparative Example 3 and close to that of Comparative Example 5. The permeability of the electrocatalyst layer in embodiment 5 is 17nm 2 . Therefore, layer A has improved performance in air at high current densities for electrocatalyst layers with high kinetic performance.

Embodiment 6

[0183] Example 6 corresponds to Comparative Example 4, with layer A added. The performance of Example 6 in air at high current density is similar to that of Comparative Example 4. The permeability of the electrocatalyst layer in embodiment 6 is 21nm 2 . Table 8 summarizes the permeability of the layers in these examples.

[0184] Table 8

[0185] Permeability nm 2

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Abstract

The present invention provides a catalysed ion-conducting membrane comprising an ion-conducting membrane, an electrocatalyst layer having two opposing faces, and a layer A comprising an ion-conducting material and a carbon containing material. Also provided are methods for preparing the catalysed ion-conducting membrane.

Description

technical field [0001] The invention relates to a catalytic ion-conducting membrane. More specifically, the present invention relates to a catalytic ion conducting membrane comprising an additional layer on the face of the electrocatalyst layer. Background technique [0002] A fuel cell is an electrochemical cell comprising two electrodes separated by an electrolyte. A fuel such as hydrogen, an alcohol such as methanol or ethanol, or formic acid is supplied to the anode, and an oxidant such as oxygen or air is supplied to the cathode. Electrochemical reactions occur at the electrodes, and the chemical energy of the fuel and oxidant is converted into electrical energy and heat. Electrocatalysts are used to facilitate the electrochemical oxidation of fuel at the anode and the electrochemical reduction of oxygen at the cathode. [0003] Fuel cells are generally classified according to the nature of the electrolyte used. The electrolyte is typically a solid polymer ion-condu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1004H01M4/88H01M4/86
CPCH01M4/8605H01M4/881H01M4/8814H01M8/1004Y02E60/50H01M4/8828H01M4/9083
Inventor D·丰格兰德乔纳森·沙曼
Owner JOHNSON MATTHEY HYDROGEN TECH LTD