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Electrode catalyst for fuel cell and fuel cell

A technology for electrode catalysts and fuel cells, which is applied in the direction of fuel cells, battery electrodes, solid electrolyte fuel cells, etc., can solve the problems of inability to obtain, and achieve the effects of improving high output, reducing size, and improving battery voltage

Inactive Publication Date: 2008-02-13
TOYOTA JIDOSHA KK +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, voltage drop suppression during lifetime testing has been limited to approximately 15 mV / 1000 hours
Therefore, the desired level of 5 mV / 1000 hours cannot be obtained, which becomes a problem

Method used

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  • Electrode catalyst for fuel cell and fuel cell

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0034] will have approximately 1000m 2 A commercially available carbon black powder having a specific surface area per g (50 grams) was added to 0.5 liter of pure water and allowed to disperse therein. A chloroplatinic acid solution containing 5.0 g of platinum was added dropwise to the obtained diffusion solution, and mixed well with carbon. Then, the solution was neutralized with an ammonia solution, followed by filtration. Next, the above-prepared cake was evenly dispersed in one liter of pure water again. A diffusion solution prepared by dissolving cobalt nitride containing 0.5 g of cobalt in 0.1 liter of pure water was added dropwise to the solution. The resulting solution was neutralized with an ammonia solution, followed by filtration. The resulting cake was vacuum dried at 100°C for 10 hours. Afterwards, the obtained product was alloyed at 600° C. for 6 hours under an argon atmosphere in an electric furnace. The catalyst prepared after alloying was identified as C...

example 2

[0039] Catalyst A (10 grams) was stirred in 1 liter of nitric acid solution (3 mol / liter) and then kept in solution at 90° C. for 1 hour, followed by filtration. The resulting cake was vacuum dried at 100°C for 10 hours. Thereafter, the obtained product was reduced at 100° C. for 1 hour in a hydrogen atmosphere of an electric furnace, thereby obtaining a catalyst powder (II).

[0040] As in the case of Example 1, the physical properties of the catalysts were determined. The measured catalyst particle size is 3.7 nanometers, the amount of basic surface functional groups is 62meq, the pH value in water is 6.8, and the specific surface area is 378m 2 / g.

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Abstract

A flooding phenomenon is suppressed in a high current density loading region so as to attempt the improvement of cell performance of fuel cells. An electrode catalyst for fuel cells, in which a catalyst comprising an alloy catalyst composed of a noble metal and one or more transition metals and having surface characteristics such that it shows a pH value in water of 6.0 or more is supported on conductive carriers, and a fuel cell using such electrode catalyst for fuel cells, are provided.

Description

technical field [0001] The present invention relates to an electrode for a fuel cell having a suppressing effect on flooding in a high current density load region, and to a fuel cell having superior durability. Background technique [0002] In such a fuel cell, that is, in the fuel cell, a solid polymer electrolyte membrane having hydrogen ion permselectivity is bonded in an airtight manner to an electrode catalyst layer on which a catalyst supporting carrier is laminated, and wherein The solid polymer electrolyte membrane with the electrode catalyst layer is sandwiched by a pair of electrodes with gas diffusion properties, and according to their polarity, in the two electrodes (anode and cathode) sandwiching the solid polymer electrolyte membrane The electrode reaction represented by the following reaction formula proceeds to obtain electric energy. [0003] Anode (hydrogen electrode): H 2 →2H + +2e - (1) [0004] Cathode (oxygen electrode): 2H + +2e - +...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92H01M4/88B01J23/00H01M8/10
CPCB01J23/89H01M2008/1095B01J35/006H01M4/926H01M4/86B01J21/18Y02E60/50B01J35/0013B01J23/58H01M4/921B01J35/393B01J35/23
Inventor 斋藤克史高桥宏明河合秀保田端寿晴永田贵宽寺田智明堀内洋辅濑户山德彦朝冈贤彦
Owner TOYOTA JIDOSHA KK
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