Method for generating oxygen, and water electrolysis device

a technology of water electrolysis and oxygen, which is applied in the direction of electrolysis components, electrolysis processes, electrolysis coatings, etc., to achieve the effect of efficient oxygen generation

Inactive Publication Date: 2015-10-29
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0038]The present invention provides a method for efficiently generating oxygen by electrolyzing water using a silver delafossite compound as an anode. The present invention also provides a water electrolysis device and an anode, both of which are suitable for the method.

Problems solved by technology

However, Great Britain Patent Publication No. 1400948B is silent about a method for generating oxygen.

Method used

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  • Method for generating oxygen, and water electrolysis device
  • Method for generating oxygen, and water electrolysis device
  • Method for generating oxygen, and water electrolysis device

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0051]In the first embodiment, a silver cobalt delafossite compound represented by a chemical formula AgCoO2 is used as a silver delafossite compound.

[0052]FIG. 1 shows a schematic view of a water electrolysis device 100 according to a first embodiment. The water electrolysis device 100 according to the first embodiment comprises a container 16, an anode 11, a cathode 12, and a power supply 14.

[0053](Container 16)

[0054]An electrolyte aqueous solution 15 is stored in the container 16. An example of the electrolyte aqueous solution 15 is an alkaline aqueous solution such as a potassium hydroxide aqueous solution or sodium hydroxide aqueous solution. Water is electrolyzed using the alkaline aqueous solution to improve the efficiency of the oxygen generation and to decrease an electric power necessary for the electrolysis.

[0055]Another example of the electrolyte included in the electrolyte aqueous solution 15 is sulfuric acid, nitric acid, or perchloric acid. More specifically, an examp...

second embodiment

[0080]In the second embodiment, a silver rhodium delafossite compound represented by a chemical formula AgRhO2 is used as a silver delafossite compound.

[0081]FIG. 5 shows a schematic view of a water electrolysis device 200 according to a second embodiment. The water electrolysis device 200 according to the second embodiment comprises a container 21, an anode 22, a cathode 23, and a power supply 24.

[0082](Container 21)

[0083]An electrolyte aqueous solution 25 is stored in the container 21. An example of the electrolyte aqueous solution 25 is an alkaline aqueous solution such as a potassium hydroxide aqueous solution or sodium hydroxide aqueous solution. Water is electrolyzed using the alkaline aqueous solution to improve the efficiency of the oxygen generation and to decrease an electric power necessary for the electrolysis.

[0084]Another example of the electrolyte included in the electrolyte aqueous solution 25 is sulfuric acid, nitric acid, or perchloric acid. More specifically, an e...

##ventive example 1

Inventive Example 1

Preparation of the anode 11

[0112]The anode 11 according to the inventive example 1 was made by supporting a silver cobalt delafossite compound on a conductive carbon substrate.

[0113]First, the silver cobalt delafossite compound was prepared by a hydrothermal synthesis method.

[0114]Particularly, cobalt hydroxide represented by the chemical formula Co(OH)2 (available from Wako Pure Chemical Industries, Ltd.) was heated under an oxygen atmosphere at a temperature of 120 degrees Celsius for 24 hours to give cobalt oxyhydroxide represented by the chemical formula CoOOH. Cobalt oxyhydroxide represented by the chemical formula CoOOH (0.25 grams) and silver oxide represented by the chemical formula Ag2O (available from Wako Pure Chemical Industries, Ltd., 0.63 grams) were mixed with a sodium hydroxide aqueous solution (40 milliliters) having a concentration of 2 mol / L to give a mixture.

[0115]The mixture was heated in a Teflon (registered trade mark) vessel at a temperatur...

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Abstract

The present invention provides a method for generating oxygen. The method comprises (a) preparing a water electrolysis device comprising a container storing an electrolyte aqueous solution; an anode which is in contact with the electrolyte aqueous solution and includes at least one silver delafossite compound selected from the group consisting of a silver cobalt delafossite compound represented by a chemical formula AgCoO2 and a silver rhodium delafossite compound represented by a chemical formula AgRhO2; a cathode which is in contact with the electrolyte aqueous solution; and a power supply, wherein the at least one silver delafossite compound is in contact with the electrolyte aqueous solution, and (b) applying an electric potential difference between the cathode and the anode using the power supply to generate oxygen on the anode due to electrolysis of water which occurs on the at least one silver delafossite compound.

Description

BACKGROUND[0001]1. Field of the Invention[0002]The present invention relates to a method for generating oxygen and a water electrolysis device. The present invention also relates to an anode used for the method.[0003]2. Description of the Related Art[0004]Great Britain Patent Publication No. 1400948B discloses a method for generating chlorine by electrolyzing sodium chloride using an anode having a delafossite compound represented by a chemical formula ABO2 (where A represents platinum, palladium, silver, or cobalt, and B represents chromium, iron, cobalt, rhodium, aluminum, gadolinium, scandium, indium, thallium, lead, ruthenium, or lanthanide) on the surface thereof. However, Great Britain Patent Publication No. 1400948B is silent about a method for generating oxygen.SUMMARY[0005]The present invention provides a method for generating oxygen, the method comprising:[0006](a) preparing a water electrolysis device comprising:[0007]a container storing an electrolyte aqueous solution;[0...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C25B11/04C25B1/10
CPCC25B1/10C25B11/0447Y02E60/36C25B1/04C25B9/73C25B11/075
Inventor TANIGUCHI, REIKOTOYODA, KENJIMIYATA, NOBUHIRO
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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