JP2913171B1 - Polymer solid electrolyte type water electrolysis ozone generator - Google Patents

Abstract

Abstract: [PROBLEMS] To electrolyze water using a polymer solid electrolyte,
A device that generates ozone. SOLUTION: A polymer solid electrolyte type water electrolysis ozone generator using a carbon fiber woven fabric or a mat-like fabric which is electrodeposited with lead dioxide, and using this as a lead dioxide catalyst on the anode side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention electrolyzes water using a solid polymer electrolyte and generates ozone by means of a lead dioxide catalyst at the anode.
Sterilization purification, i.e. water supply, tap water treatment, pool water purification,
For sterilization and purification of water for food processing, disinfection of medical equipment, sterilization, etc.
In addition, deodorization, decolorization, that is, decolorization of dyeing wastewater, deodorization of septic tanks,
It is widely used for oxidative decomposition such as decolorization, pulp bleaching, indoor odor treatment, decomposition of harmful organic substances in water, ozone oxidation in organic synthesis, and oxidation and decomposition in semiconductor manufacturing processes.

[0002]

2. Description of the Related Art Conventionally, as a lead dioxide electrode, a perforated plate having a mesh-like hole formed on a titanium metal plate is platinum-plated, and this is plated in a lead nitrate solution or lead (II) tetrafluoroborate.
It was immersed in a solution, anodized, and treated with lead dioxide.

[0003]

In this case, there was a problem in contact with the solid polymer electrolyte, and there were problems of high electrical contact resistance, high cell voltage, and large heat loss. Therefore,
There is a need for a lead dioxide catalyst that can adhere to a flexible polymer solid electrolyte.

[0004]

In order to solve the above-mentioned problems, a polymer solid formed by subjecting a carbon fiber woven fabric or a mat-like fabric to electrodeposition of lead dioxide and using this as a lead dioxide catalyst on the anode side. An electrolytic water electrolysis ozone generator was used as the means.

[0005] When electrodepositing lead dioxide on a carbon fiber woven or mat-like cloth, a conductive band made of platinum net is provided along one side of a square frame made of an electrically insulating material along the frame. Apply so that the four peripheries of the cloth or mat-like cloth are in contact with each other, fix it so as to sandwich it with the holding frame, and immerse it in a lead (II) tetrafluoroborate solution. Connected to the anode, on the other hand, immersed in a solution using a platinum plate as a cathode plate, connected to the cathode of a DC power supply, and applied a DC voltage to perform electrodeposition of lead dioxide on carbon fiber woven or mat-like cloth, A polymer solid electrolyte type water electrolysis ozone generator using a carbon fiber woven fabric or a mat-like fabric on which lead is electrodeposited as a lead dioxide catalyst was used as the means.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Thousands of ultrafine carbon fibers having a thickness of a micron unit are collected into a single woven fiber, which is made into a cloth by plain weaving, and cut into an appropriate size. After degreasing in a degreasing bath, washing with water, and drying, square frame 7 made of an electrical insulating material
Attach to The carbon fiber woven fabric 6 is applied so that the four sides of the carbon fiber woven fabric 6 are in average contact with the conductive band 8 made of platinum mesh attached along the periphery of the square frame 7, and is fixed by being held by the holding frame 9. An electrodeposition bath 13 containing a solution of lead (II) tetrafluoroborate 10 dissolved in pure water in a ratio of 1/2 to 1/4 mol is prepared, and the square frame 7 is immersed in the bath. The platinum electrode plate is immersed in a position facing the square frame 7, the anode of the DC power supply 11 is connected to the platinum band conductive band 8 of the square frame 7, and the cathode is connected to the platinum electrode plate.

Electrodeposition is performed for several hours by applying a current at a rate of 0.2 to 1 A / dm ² . Electrodeposition of lead dioxide is performed uniformly on the carbon fiber woven fabric 6 surface. After electrodeposition, remove from the frame, wash with water, dry,
Placed in a vacuum vessel, the temperature in a vacuum of 10 ^-3 Torr from 100 to 13
Hold at 0 ° C. and perform vacuum treatment for about 24 hours.

In assembling the electrolytic cell 4, the carbon fiber woven fabric 6 subjected to the electrodeposition treatment with lead dioxide is applied to the surface of the polymer solid electrolyte 2, pressed down by the porous electrode 5, and the polymer solid electrolyte 2 and the porous electrode 5 Used in a state sandwiched between.

[0009]

When, according to the present invention lead dioxide directly processed conventional titanium porous plate when the electrolysis current 50A / dm ^2, although electrolysis voltage was about 6V, according to the present invention, at 50A / dm ² The electrolysis voltage dropped to 4.5V. The ozone concentration is related to the temperature of the electrolyte, and is preferably 30 ° C. or less, and requires cooling. However, since the heat generation loss due to electrolysis is reduced due to the above-mentioned voltage drop, cooling is facilitated, and generation of a high concentration is easily maintained. There was also an effect.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a polymer solid electrolyte type water electrolysis ozone generator according to an embodiment of the present invention.

FIG. 2 is a perspective view in which a carbon fiber woven fabric is applied to a conductive band made of a platinum net, and is sandwiched and fixed by a holding frame.

FIG. 3 is a schematic view of an electrodeposition bath for uniformly depositing lead dioxide on a carbon fiber woven fabric surface.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Polymer solid electrolyte type water electrolysis ozone generator 2 Polymer solid electrolyte (ion exchange membrane) 3 Carbon fiber woven or mat-like cloth electrodeposited with lead dioxide 4 Electrolytic cell 5 Porous electrode 6 Carbon fiber woven cloth or mat Cloth 7 Square frame 8 Conductive band made of platinum net 9 Holding frame 10 Lead (II) tetrafluoroborate solution 11 DC power supply 12 Platinum plate 13 Electroplating bath

Claims (2)

(57) [Claims] 1. An apparatus for electrolyzing water using a solid polymer electrolyte 2 to generate ozone, electrodepositing lead dioxide on a carbon fiber woven or mat-like cloth 6 and oxidizing the electrodeposited carbon dioxide on the anode side. A polymer solid electrolyte type water electrolysis ozone generator characterized by being used as a lead catalyst. 2. In performing electrodeposition of lead dioxide on a carbon fiber woven or mat-like cloth 6, a conductive band made of platinum net is provided along one side of a square frame 7 made of an electrically insulating material along the frame. And the four peripheral portions of the carbon fiber woven or mat-like cloth 6 are brought into contact with each other, and are fixed to the square frame 7 by the holding frame 9 so as to be sandwiched between them, and this is fixed to a lead (II) tetrafluoroborate solution 10.
, And a platinum net conductor is connected to the anode of the DC power supply 11,
On the other hand, the platinum plate 12 is immersed in a solution as a cathode plate, and this is connected to the cathode of the DC power supply 11, and a DC voltage is applied. 2. The polymer solid electrolyte type water electrolysis ozone generator according to claim 1, wherein the electrodeposited carbon fiber woven or mat-like cloth 6 is a lead dioxide catalyst.