Electrode for electrolysis, electrolytic process using the electrode, and electrolytic apparatus using them

a technology of electrolysis and electrodes, applied in silicon electrodes, electrolysis coatings, manufacturing tools, etc., can solve the problems of ozone and hydrogen peroxide dissolved in aqueous solution that cannot be obtained by a single electrolysis operation, the cost of the apparatus itself, and the inability to achieve a single electrolytic operation. to achieve the effect of facilitating the production of at least on

Inactive Publication Date: 2008-03-13
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0020] According to the fifth aspect of the present invention, by electrolyzing water or an electrolyte solution at a current density from 0.1 mA / cm2 to 2000 mA / cm2 while using an electrode for electrolysis according to the above-described aspects of the present invention as an anode, at least one of ozone, hydrogen peroxide and another active oxygen species can be produced efficiently as in the sixth aspect of the present invention.
[0021] By the electrolysis of water or an electrolyte solution according to such an electrolytic process, plural oxidizing substances can be formed so that OH radicals having a relatively short life can be formed easily at a site where they are required. The oxidizing power of the OH radicals thus formed can be used effectively.
[0022] The electrolytic apparatus according to the seventh aspect of the present invention is equipped with an electrode for electrolysis as described in any one of the above-described first to fourth aspects of the present invention and electrolyzes water or an electrolyte solution by an electrolytic process according to the fifth or sixth aspect of the present invention. This facilitates production of at least one of ozone, hydrogen peroxide and another active oxygen species at a site where it is required.

Problems solved by technology

The above-described process of Patent Document 1 however has a problem that it uses diamond as an electrode substance, which raises the cost of the apparatus itself.
The above-described process of Patent Document 2, on the other hand, has also a problem that it is inferior in working efficiency because ozone and hydrogen peroxide must be produced by electrolysis in each of a plurality of cells so that an aqueous solution having ozone and hydrogen peroxide dissolved therein cannot be obtained by a single electrolytic operation.

Method used

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  • Electrode for electrolysis, electrolytic process using the electrode, and electrolytic apparatus using them
  • Electrode for electrolysis, electrolytic process using the electrode, and electrolytic apparatus using them
  • Electrode for electrolysis, electrolytic process using the electrode, and electrolytic apparatus using them

Examples

Experimental program
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example 1

[0038]FIG. 1 is a cross-sectional plan view of an electrode 1 for electrolysis of Example 1 as one example of the electrode for electrolysis according to the present invention. The electrode 1 for electrolysis has, as shown in FIG. 1, a substrate 2, an intermediate layer 3 formed on the surface of the substrate 2, and a surface layer 4 formed on the surface of the intermediate layer 3.

[0039] In the present invention, the substrate 2 is made of a conductive material such as platinum (Pt), a valve metal such as titanium (Ti), tantalum (Ta), zirconium (Zr) or niobium (Nb), an alloy of two or more of these valve metals, or silicon. In particular, silicon having a planarized surface is employed for the substrate 2 to be used in the present Example.

[0040] The intermediate layer 3 is made of a metal resistant to oxidation such as platinum, gold (Au), a metal oxide having conductivity such as iridium oxide, palladium oxide or ruthenium oxide, or an oxide superconductor, or a metal having ...

example 2

[0051] Referring to FIG. 3, a description will next be made of an electrode 6 for electrolysis according to Example 2. FIG. 3 is a cross-sectional plan view of the electrode 6 for electrolysis as one example of the electrode for electrolysis according to the present invention. As illustrated in FIG. 3, the electrode 6 for electrolysis is composed of a substrate 7, an adhesion layer 8 formed on the surface of the substrate 7, an intermediate layer 9 formed on the surface of the adhesion layer 8, and a surface layer 10 formed on the surface of the intermediate layer 9.

[0052] The substrate 7 in the present invention is made of a material similar to that constituting the substrate 2 used for the electrode 1 for electrolysis in Example 1 so that the substrate 7 in Example 2 is made of silicon.

[0053] The adhesion layer 8 is formed on the surface of the substrate 7 and serves to improve the adhesion between the substrate 7 and the intermediate layer 9 formed of, for example, platinum on ...

example 3

[0076] Electrode 26 for electrolysis in Example 3 will next be described with reference to FIG. 11. FIG. 11 is a cross-sectional plan view of the electrode 26 for electrolysis as one example of the electrode for electrolysis according to the present invention. As illustrated in FIG. 11, the electrode 26 for electrolysis has a substrate 27, an adhesion layer 28 formed on the surface of the substrate 27, an intermediate layer 29 formed on the surface of the adhesion layer 28, and a surface layer 30 formed on the surface of the intermediate layer 29. This electrode 26 for electrolysis is equipped, on the side of the substrate 27, with a titanium plate 31 as an electroconducting portion. The titanium plate 31 and the intermediate layer 29 are made conductive via a silver paste 32 serving as a conductive material disposed on the end face of the electrode 26. The silver paste 32 and titanium plate 31 are covered with a sealing material 33 and do not contribute to electrolysis.

[0077] In t...

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Abstract

An object of the present invention is to provide an electrode for electrolysis which is available by an easy fabrication process, can produce ozone water at high efficiency and also can produce hydrogen peroxide and OH radicals having a high oxidizing power by the electrolysis of water at a low current density; an electrolytic process using the electrode; and an electrolytic apparatus using them. The electrode for electrolysis according to the present invention has a substrate and a surface layer formed on the surface thereof, the surface layer being made of anatase type titanium oxide.

Description

BACKGROUND OF THE INVENTION [0001] The present invention relates to an electrode for electrolysis to be used in electrolysis for industrial or consumer use, an electrolytic process using the electrode, and an electrolytic apparatus using them. [0002] Ozone is typically a very oxidative substance so that water having ozone dissolved therein which is so-called ozone water is expected to be utilized for various cleaning and sterilizing treatments of water and sewerage systems, food, or the like and cleaning treatment in a fabrication process of semiconductor devices. As a process of producing ozone water, there is known a process of dissolving, in water, ozone produced by ultraviolet irradiation or electric discharge, or a process of producing ozone in water by electrolysis of water. [0003] In Japanese Patent Laid-Open No. 11-269686 (Patent Document 1), there is disclosed a process of producing oxygen, ozone and hydrogen peroxide by electrolysis of water while using an electrode substa...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C25B1/04C25B1/30C25B11/04C25B9/00
CPCC02F1/4618C02F2001/46138C02F2001/46185C02F2201/4611C02F2201/46115C02F2201/46125Y02E60/366C25B1/13C25B1/30C25B11/0421C25B11/0452C25B11/0484C02F2209/23C25B11/059C25B11/077C25B11/093Y02E60/36C25B11/02
Inventor KITSUKA, KENTAKANEDA, KAZUHIROIKEMATSU, MINEOISEKI, MASAHIRO
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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