Permelec Electrode Ltd.

Other

Toyo Tanso Co., Ltd.

Kaneka Corporation

Toagosei Company, Ltd.

Shinshu University

Chlorine Engineers Corp., Ltd.

Institute of National Colleges of Technology, Japan

Katayama Chemical, Inc.

Premelec Electrode Ltd.

Masaharu Uno

Yoshinori Nishiki

Tsuneto Furuta

Takayuki Shimamune

Shuhei Wakita

Setsuro Ogata

Masashi Tanaka

Hiroshi Inoue

Yasuo Nakajima

Tetsuro Tojo

Masashi Hosonuma

Chiaki Iwakura

Yasuki Yoshida

Kunio Nishimura

Tateki Kurosu

Hitoshi Takebayashi

Tomoyasu Shibata

Yuji Yamada

Yuki Izawa

Akira Katsumoto

Shuji Nakamatsu

Yasushi Murakami

Takahiro Ashida

Miwako Nara

Wataru Sugimoto

Masashi Kodama

Masao Sekimoto

Yoshio Takasu

Genzo Yamane

Masaaki Katoh

Noriyuki Kitaori

Osamu Fukunaga

Yoshiyuki Kawaguchi

Madhu Sudan Saha

Miho Ohashi

Noriyuki c/o Tokyo Nat College Of Tech Kitaori

The current invention is to provide an oxygen gas diffusion cathode for brine electrolysis which reduces an initial electrolysis voltage and is excellent in the durability against short-circuit, and an electrolytic cell and an electrolytic method using the same. The oxygen gas diffusion cathode for brine electrolysis includes a gas diffusion layerand a reaction layeron one surface of an electro-conductive substrate, and an electro-conductive layeron the opposite surface thereof. The present oxygen gas diffusion cathode reduces the resistance of the electro-conductive substrateand supplies uniform current by mounting the electro-conductive layer

Oxygen gas diffusion cathode, electrolytic cell employing same, method of producing chlorine gas and method of producing sodium hydroxide

The present invention provides a conductive diamond electrode structure for use in electrolytic synthesis of a fluorine-containing material with a fluoride ion-containing molten salt electrolytic bath, which comprises: a conductive electrode feeder; and a conductive diamond catalyst carrier comprising a conductive substrate and a conductive diamond film carried on a surface thereof, wherein the conductive diamond catalyst carrier is detachably attached to the conductive electrode feeder at a portion to be immersed in the electrolytic bath. Also disclosed is an electrolytic synthesis of a fluorine-containing material using the conductive diamond electrode structure.

Conductive diamond electrode structure and method for electrolytic synthesis of fluorine-containing material

The present invention provides a method of sterilization with an electrolytic water, including: electrolyzing a raw water with an electrolytic unit including: a cathode; and an anode at least having a part containing a conductive diamond to prepare an electrolytic water; and ejecting the electrolytic water to a substance to be sterilized, and an electrolytic water ejecting apparatus.

Method of sterilization and electrolytic water ejecting apparatus

The present invention provides an electrode catalyst for electrochemical reaction, the electrode catalyst having: a conductive diamond particle having fine pores on a surface thereof; and a carbon-reactive catalyst metal in the fine pores, a process for producing the electrode catalyst, and an electrode.

Electrode catalyst for electrochemical reaction, process for producing the electrode catalyst and electrode for electrochemical reaction having the electrode catalyst

The present invention provides an oxygen-reduction gas diffusion cathode having: a porous conductive substrate; diamond particle having a hydrophobic surface; and catalyst particle, the diamond particle and the catalyst particle being disposed on the porous conductive substrate, and a method of sodium chloride electrolysis using the cathode.

Oxygen-reducing gas diffusion cathode and method of sodium chloride electrolysis

The present invention provides a conductive diamond electrode having: a conductive substrate; a coating layer formed on a surface of the conductive substrate, the coating layer containing one of a metal and an alloy each including at least one of niobium and tantalum; and a conductive diamond layer formed on a surface of the coating layer, and a process for producing the conductive diamond electrode.

Conductive diamond electrode and process for producing the same

The present invention provides an electrode for electrolysis including: a conductive substrate; and a conductive diamond formed on a surface of the conductive substrate, the conductive substrate having at least one surface shape selected from the group consisting of: (a) a surface shape of a combination of an Ra of 100-1,000-&#x3bc;m and an RSm of 50-10,000 &#x3bc;m; (b) a surface shape of a combination of an Ra of 2.5-100 &#x3bc;m and an RSm of 1.5-800 &#x3bc;m, and (c) a surface shape of a combination of an Ra of 0.01-2 &#x3bc;m and an RSm of 0.005-250 &#x3bc;m, and a process for producing the electrode.

Electrode for electrolysis and process for producing the same

The present invention provides an electrolytic anode for use in electrolytically synthesizing a fluorine-containing substance by using an electrolytic bath containing a fluoride ion including: an electroconductive substrate having a sure including an electroconductive carbonaceous material; and an electroconductive carbonaceous film having a diamond structure, the electroconductive carbonaceous film coating a part of the electroconductive carbonaceous substrate, and a method for electrolytically synthesizing a fluorine-containing substance using the electrolytic anode.

Electrolytic anode and method for electrolytically synthesizing fluorine containing substance using the electrolytic anode

A conductive diamond electrode including a conductive substrate comprising a carbonaceous material, a conductive diamond catalyst layer formed on a surface of the conductive substrate, and a carbon fluoride formed on an exposed portion present on the surface of the conductive substrate. The formed carbon fluoride prevents the conductive substrate from contacting with an electrolytic solution, thereby suppressing corrosion of the substrate. A long life of the electrode can be attained.

A diamond electrode having a prolonged life by combining a conventional diamond electrode having a relatively short life with other components is provided. A diamond electrode for electrolysis includes an electrode substrate, at least the surface of which comprises Magneli phase titanium oxide, and conductive diamond supported as an electrode catalyst on a surface of the electrode. The electrode catalyst may contain a titanium oxide powder. Magneli phase titanium oxide improves conductivity without forming a stable oxide layer on the substrate surface.

Diamond electrode for electrolysis

An industrially useful peroxo-carbonate is electrolytically produced using, as a raw material, carbon dioxide that is inexpensive and easily available. A process of producing a peroxo-carbonate, includes feeding a carbon dioxide gas into an electrolytic cell having a gas diffusion anode and a cathode, or feeding a liquid having a carbon dioxide gas dissolved therein into an electrolytic cell having an anode and a cathode, and electrolytically converting the carbon dioxide gas into a peroxo-carbonate. By properly setting up electrolytic conditions such as electrodes, a useful peroxo-carbonate can be produced with high current efficiency using inexpensive carbon dioxide as the raw material.

Process of producing peroxo-carbonate

An electrolytic cell and process for the simultaneous production of hydrogen peroxide and hypochlorous ion. The electrolytic cell has an anode chamber housing an insoluble anode capable of oxidizing halide ion, a cathode chamber housing a gas diffusion cathode capable of oxidizing an oxygen-containing gas to produce hydrogen peroxide, a membrane separating the anode and cathode chambers, and means for supplying water containing halide ion to the anode chamber and an oxygen-containing gas and an electrolyte to the cathode chamber, whereby hypohalide and hydrogen peroxide are produced in the anode chamber and the cathode chamber, respectively. Also disclosed is a process for treating water using the electrolytic cell.

Electrolytic cell and process for the production of hydrogen peroxide solution and hypochlorous acid

An electrolytic cell and method of electrolysis for producing hydrogen peroxide at a moderate current density while preventing metal deposition on the cathode surface. A feed water from which multivalent metal ions have been removed and in which a salt of a univalent metal, e.g., sodium sulfate, has been dissolved in a given concentration is prepared with an apparatus for removing multivalent metal ions and dissolving a salt in low concentration. The feed water is supplied to an electrolytic cell. Even when electrolysis is continued, almost no deposition of a hydroxide or carbonate occurs on the cathode because multivalent metal ions are not present in the electrolytic solution. Due to the dissolved salt, a sufficient current density is secured to prevent an excessive load from being imposed on the electrodes, etc. Thus, stable production of hydrogen peroxide is possible over a long period of time.

Electrolytic cell for hydrogen peroxide production and process for producing hydrogen peroxide

A process for the production of hydrogen peroxide solution from seawater as a starting material substantially free of effective chlorine or organic halogen compounds. An electric current is passed through an insoluble anode and an oxygen gas diffusion cathode while keeping the halide ion concentration of anolyte supplied to the anode chamber to a level not greater than 1 g/l. Hydrogen peroxide thus generated dissolves in the catholyte. Anodic oxidation of halide ions is suppressed, to thereby inhibit the production of effective chlorine.

Process for the production of hydrogen peroxide solution

A method and apparatus for water treatment. The method comprises supplying an oxygen-containing gas to cathode to yield hydrogen peroxide, supplying an inorganic acid to anode through an acid solution addition opening to yield an oxidation product, e.g., hypochlorous acid, and using both the hydrogen peroxide and oxidation product thus generated to treat a liquid to be treated. The atmosphere around the cathode surface is kept neutral to acidic due to the acidity of the coexisting oxidation product to thereby inhibit the deposition of metal hydroxides.

Method and apparatus for water treatment

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Fujisawa, Japan

Masaharu Uno