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Method for producing electrode catalyst, and electrode catalyst

A technology for electrode catalysts and manufacturing methods, applied in chemical instruments and methods, physical/chemical process catalysts, electrodes, etc., can solve the problems of expensive platinum and limited resources

Inactive Publication Date: 2012-02-22
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, platinum is expensive and its resources are limited, so an electrode catalyst made of a relatively cheap material with a large amount of resources is required.

Method used

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  • Method for producing electrode catalyst, and electrode catalyst
  • Method for producing electrode catalyst, and electrode catalyst
  • Method for producing electrode catalyst, and electrode catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0054] Hereinafter, although an Example demonstrates this invention in more detail, this invention is not limited to these Examples.

[0055] In addition, the evaluation method of each Example is as follows.

[0056] (1) BET specific surface area (m 2 / g) was obtained by nitrogen adsorption method.

[0057] (2) The crystal structure was carried out using a powder X-ray diffractometer.

[0058] (3) Amount of char The obtained electrode catalyst was placed in an alumina crucible and fired in a box furnace at 1000° C. for 3 hours in an air atmosphere to obtain a char value (loss on ignition) obtained from the following formula.

[0059] Carbon content (mass%) = (W I -W A ) / W I ×100

[0060] (Here, W I is the mass of the electrode catalyst before firing, W A is the mass after firing. )

[0061] (4) The carbon coating ratio was calculated|required using the following formula.

[0062] Carbon coverage = carbon amount (mass%) / BET specific surface area (m 2 / g)

manufacture example 1

[0063] Production Example 1: Preparation of the first material (Ti-containing compound)

[0064] Titanium (IV) sulfate aqueous solution (manufactured by Kanto Chemical Co., Ltd., diluted to 12% by mass of titanium sulfate) and NH 3 These were neutralized with water (manufactured by Kanto Chemical Co., Ltd., diluted to 4% by mass), and the obtained precipitate was filtered and washed to obtain a first material (Ti-containing compound). figure 1 A powder X-ray diffraction pattern of the first material is shown. The first material was dispersed in NH with pH adjusted to 10.5 at a concentration of 1% by mass. 3 In water, a Ti-containing compound slurry is obtained.

manufacture example 2

[0065] Production Example 2: Preparation of the first material (Zr-containing compound)

[0066] An aqueous solution obtained by dissolving zirconium oxychloride (manufactured by Wako Pure Chemical Industries) in pure water (8% by mass of zirconium oxychloride) and NH 3 These were neutralized with water (manufactured by Kanto Chemical Co., Ltd., diluted to 4% by mass), and the obtained precipitate was filtered and washed to obtain a first material (Zr-containing compound). As a result of powder X-ray diffraction measurement, the first material was zirconium hydroxide. The first material was dispersed in NH with pH adjusted to 10.5 at a concentration of 1% by mass of the first material. 3 In water, a Zr-containing compound slurry was obtained.

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Abstract

Disclosed is a method for producing an electrode catalyst, which comprises a step wherein a precursor of the electrode catalyst is fired under the conditions where the second material specified below is changed into a carbon material. The precursor of the electrode catalyst is obtained by hydrothermally reacting a mixture that contains the first material specified below and the second material specified below in the presence of water that is in a supercritical state or in a subcritical state, or alternatively obtained by mixing the second material specified below with a reaction product that is obtained by hydrothermally reacting the first material specified below in the presence of water that is in a supercritical state or in a subcritical state. First material: a metal compound that is configured from one or more metal elements selected from the group consisting of group 4A elements and group 5A elements, and one or more non-metal elements selected from the group consisting of hydrogen, nitrogen, chlorine, carbon, boron, sulfur and oxygen Second material: a precursor of a carbon material.

Description

technical field [0001] The invention relates to a method for producing an electrode catalyst and the electrode catalyst. Background technique [0002] Electrode catalysts are solid catalysts supported on electrodes (particularly, on the surface of electrodes), and are used, for example, in electrolysis of water, electrolysis of organic substances, electrochemical systems of fuel cells, and the like. Examples of the electrode catalyst used in the acidic electrolyte include noble metals. Among noble metals, platinum in particular is widely used because it is stable even at high potentials in acidic electrolytes. [0003] However, since platinum is expensive and its resources are limited, an electrode catalyst made of a relatively inexpensive material with a large amount of resources is required. [0004] Tungsten carbide is known as a relatively inexpensive electrode catalyst that can be used in acidic electrolytes (see Non-Patent Document 1 described later). In addition, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/18C25B11/06H01M4/88H01M4/90H01M8/10
CPCH01M4/8657H01M4/9016H01M2008/1095Y02E60/50B01J21/18C25B11/04H01M4/88H01M8/10B01J21/063
Inventor 服部武司伊藤丰真木一
Owner SUMITOMO CHEM CO LTD
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