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Catalyst powder, catalyst electrode and electrochemical device

A catalyst and electrochemical technology, which is applied in the field of electrochemical devices, can solve problems such as increased binder content, small specific surface area of ​​catalyst particles, and reduced stability of catalyst layers, and achieve the effect of improving output characteristics and increasing effective reaction area

Inactive Publication Date: 2004-10-13
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the catalyst powder with the above-mentioned 20-55wt% catalyst particle loading ratio is used, due to the increase in the specific surface area of ​​the catalyst particles, the increase in the thickness of the catalyst layer leads to an increase in the amount of binder required, and leads to an increase in the electronic resistance of the electrode
In addition, forming a thicker catalyst layer also involves problems such as layer body cracking, which leads to a decrease in the stability of the catalyst layer
[0007] On the other hand, when a catalyst powder with a high catalyst particle load ratio is used, the specific surface area of ​​the catalyst particles is so small that a sufficient reaction area cannot be obtained, and good output characteristics cannot be obtained

Method used

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  • Catalyst powder, catalyst electrode and electrochemical device
  • Catalyst powder, catalyst electrode and electrochemical device
  • Catalyst powder, catalyst electrode and electrochemical device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] In 10 parts by weight of Ketjenblack EC (a product of Ketjenblack International Corporation; specific surface area: 800m 2 / g; the same applies below) on the surface of platinum catalyst powder (specific surface area: 130m 2 / g), add 10 parts by weight of pure water, and after fully wetting, add 30 parts by weight of 1-propanol and 60 parts by weight of 5% Nafion (registered trademark; a product of Dupont) solution in the mixture, The resulting mixture is then mixed well. The coating material thus obtained was applied to a water-repellent-treated gas-permeable current collector, and dried to obtain a platinum areal density of 2 mg / cm 2 The oxygen electrode (cathode).

[0067] In addition, in 10 parts by weight of catalyst powder containing platinum ruthenium alloy supported on the surface of Ketjenblack EC in a weight ratio of 60 wt % (specific surface area: 230 m 2 / g), 20 parts by weight of pure water was added, and after sufficient wetting, 20 parts by weight of 1...

Embodiment 2

[0070] An MEA and an electrochemical device were prepared in the same manner as in Example 1, except that 10 parts by weight of pure water was added to 10 parts by weight of the Ketjenblack EC containing 55% by weight of Platinum catalyst powder (specific surface area: 200m 2 / g), and after sufficient wetting, 20 parts by weight of 1-propanol and 90 parts by weight of 5% Nafion solution were added to the mixture, followed by thorough mixing of the resulting mixture. The coating material thus obtained was applied to a water-repellent-treated gas-permeable current collector, and dried to obtain a platinum areal density of 2 mg / cm 2 The oxygen electrode (cathode).

Embodiment 3

[0072] An MEA and an electrochemical device were prepared in the same manner as in Example 1, except that 10 parts by weight of pure water was added to 10 parts by weight of the Ketjenblack EC containing 75% by weight of Platinum catalyst powder (specific surface area: 100m 2 / g), and after fully wetting, 10 parts by weight of 1-propanol and 40 parts by weight of 5% Nafion solution were added to the mixture, and then the resulting mixture was thoroughly mixed. The coating material thus obtained was applied to a water-repellent-treated gas-permeable current collector, and dried to obtain a platinum areal density of 2 mg / cm 2 The oxygen electrode (cathode).

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Abstract

Disclosed is a catalyst powder (1) contained in an electrode, wherein the catalyst powder includes a catalytic substance (3) supported on a conductive powder (2), the catalytic substance being comprised of at least a catalyst, the weight ratio of the catalytic substance to the catalyst powder is in the range of 55 to 75 wt%, and the areal density of the catalytic substance is in the range of 1 to 3 mg / cm 2 . Also disclosed is a catalyst electrode including the catalyst powder and a solid polymer electrolyte. Further disclosed is an electrochemical device including a plurality of electrodes, and an ionic conductor sandwiched between the electrodes, wherein the above-mentioned catalyst electrode constitutes at least one of the plurality of electrodes.

Description

Background of the invention [0001] The present invention relates to catalyst powder, catalyst electrode and electrochemical device. [0002] Solid polymer electrolyte fuel cells have higher energy density than other types of fuel cells and are considered to be easy to downsize; therefore, very high expectations are placed on the use of solid polymer electrolyte fuel cells for portable applications. expect. Thus, the solid polymer electrolyte type fuel cell constitutes a field in which much progress has been recently made in the world and much attention is being devoted to this field. [0003] The cell structure of the solid polymer electrolyte fuel cell is a multilayer structure of cathode current collector / cathode (oxygen electrode) side catalyst layer / solid polymer electrolyte / anode (fuel electrode) side catalyst layer / anode current collector, and has been Its component materials, manufacturing methods, methods of forming battery structures, etc. (see, for example, Japanes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J23/38B01J23/46B01J35/02H01M4/86H01M4/88H01M4/90H01M4/92H01M8/00H01M8/10
CPCH01M4/926H01M8/1004H01M4/8807H01M4/8882Y02E60/523Y02E60/50H01M4/8821H01M4/92H01M4/90
Inventor 本村勇人香取健二
Owner SONY CORP
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