Anode for electrolysis and method of electrolytically synthesizing fluorine-containing substance using the anode for electrolysis

an anode and electrolysis technology, applied in the field of anode materials, can solve the problems of accelerating wear of the anode, limited material usable as anode materials, and limited nickel and carbon materials, etc., and achieve the effect of improving the productivity of organic fluorine compounds, fluorine gas, and inorganic fluorine compounds

Inactive Publication Date: 2010-08-05
DE NORA PERMELEC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0031]The invention provides an electrode which comprises a substrate comprising an electrically conductive material, wherein the surface of the substrate is made of glassy carbon, and an electrically conductive diamond film with which at least part of the surface is coated, and which is for use in, e.g., the synthesis of an inorganic fluorine compound, organic fluorine compound, and fluorine gas through the electrolysis of an electrolytic bath containing HF. The invention

Problems solved by technology

In all these electrolytic processes, materials usable as electrolyzers and electrode materials are limited because of the marked corrosiveness of HF.
In particular, the materials usable as anode materials are limited to nickel and carbon.
When nickel is used as an anode, wear of this anode is considerably accelerated.
However, carbon anodes often pose a problem that the phenomenon in which the electrode is passivated, i.e., the so-called anode effect, occurs to make it difficult to continue the electrolysis.
This oxidized graphite is chemically unstable and, hence, a substitution reaction with fluorine readily proceeds to generate fluorinated graphite.
Because of these measures, the rate of generating a target substance is limited and this inhibi

Method used

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Examples

Experimental program
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Effect test

example 1

[0049]A glassy-carbon plate (GC-10, manufactured by TOKAI CARBON CO., LTD.) was used as a conductive substrate to produce a conductive-diamond electrode under the following conditions using a hot-filament CVD apparatus.

[0050]First, an abrasive material composed of diamond particles having a diameter of 1 μm was used to grind the surface of the substrate. The ground substrate surface had a Ra of 0.2 μm and a ten-point surface roughness Rz of 6 μm. Subsequently, diamond particles having an average particle diameter of 4 nm were applied as nuclei to the substrate surface. Thereafter, the substrate was attached to the hot-filament CVD apparatus. A mixed gas prepared by adding 1 vol % methane gas and 0.5 ppm trimethylboron gas to hydrogen gas was continuously passed through the apparatus at a rate of 5 L / min. While thus passing the mixed gas, the internal pressure of the apparatus was kept at 75 Torr and a voltage was applied to the filament to elevate the temperature thereof to 2,400° C...

example 2

[0069]A glassy-carbon plate was used as a conductive substrate to produce a conductive-diamond electrode in the same manner as in Example 1 using the hot-filament CVD apparatus.

[0070]This electrode was attached to a (CH3)4NF.5HF electrolytic bath immediately after preparation of the bath. A nickel plate and Cu / CuF2 were used as a cathode and a reference electrode, respectively, and constant-current electrolysis was conducted at a current density of 100 mA / cm2. Immediately after initiation of the electrolysis, the anode potential was measured and was found to be 4.6 V. At the time when the electrolysis had continued for 200 hours, the anode potential was 4.8 V.

[0071]The electrolysis was stopped, and the anode was taken out and examined for appearance. As a result, neither electrode disintegration nor the shedding of the conductive diamond film was observed. No anode effect was observed throughout the 200-hour electrolysis.

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Abstract

The present invention provides an electrode for electrolysis, wherein the electrode comprises: a substrate comprising an electrically conductive material, wherein the surface of the substrate is made of glassy carbon; and an electrically conductive diamond film with which at least part of the substrate is coated.

Description

TECHNICAL FIELD[0001]The present invention relates to an anode material which, when used in applications such as electrolysis in an electrolytic bath containing hydrofluoric acid, does not produce the anode effect even upon application of a high-current-density voltage thereto and which is free from the serious sludge generation caused by electrode dissolution, can inhibit CF4 generation, and enables the electrolysis to continue stably without suffering electrode disintegration. The invention further relates to a method of electrolysis.BACKGROUND ART[0002]An electrolytic process in which a solution prepared by dissolving an inorganic or organic compound in anhydrous hydrofluoric acid (anhydrous HF) is used as an electrolytic bath to electrolytically synthesize an inorganic fluorine compound, organic fluorine compound, or fluorine gas is in practical industrial use.[0003]Since anhydrous HF has insufficient electrical conductivity, an alkali metal fluoride such as, e.g., potassium flu...

Claims

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Application Information

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IPC IPC(8): C25B3/08C25B1/24C25B3/28
CPCC25B1/245C25B11/12C25B11/0405C25B11/051C25B11/043
Inventor TASAKA, AKIMASAUNO, MASAHARUNISHIKI, YOSHINORIFURUTA, TSUNETO
Owner DE NORA PERMELEC LTD
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