Anode for oxygen generation and manufacturing method for the same

an oxygen generation and anode technology, applied in the direction of manufacturing tools, electrical-based machining electrodes, electrode coatings, etc., can solve the problems of increasing the current of the electrolysis product, the increase of the electrolysis voltage after electrolysis, and the inability to light the electrolysis product, so as to suppress the crystallite diameter of iridium oxide, and reduce the overvoltage of the oxygen generation electrode

Inactive Publication Date: 2014-12-04
IND DE NORA SPA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0029]In the formation for the electrode catalyst layer containing iridium oxide by the present invention, baking is conducted, instead of the conventional repeated baking operations at 500° C. or more, which are the perfect crystal deposition temperature, by two steps: baking in a low temperature region of 370° C.-400° C. in an oxidation atmosphere to form a catalyst layer containing amorphous iridium oxide and post-baking in a high temperature region of 520° C.-600° C. in an oxidation atmosphere to suppress the crystallite diameter of iridium oxide in the electrode catalyst layer preferably to 8.0 nm or less and to crystallize most of the iridium oxide preferably to 60% or more in crystallinity. Thus, the growth of crystallite diameter of iridium oxide and coexistence of amorphous and crystalline iridium oxides was able to be suppressed and the electrode effective surface area of the catalyst layer was able to be increased. Thus, according to the present invention, the growth of crystallite diameter of iridium oxide can be suppressed. As the reasons, the following are considered. The baking is conducted by two stages: first, coating and b

Problems solved by technology

However, an influence by floating fine particles such as lead ion, Pb2+, or lead compounds, PbSO4 against an electrode for electrolysis and an electrolytic copper foil which is an electrolytic product cannot be made light of.
Since oxidized lead-β-PbO2 has a small electrode catalyst function, a total surface of an electrode is covered by it, although an electrode potential increases, an electrolysis continuously occurs and an electrode life as a coating to protect the electrode is prolonged, but if it is partially peeled off, an original electrode catalyst layer of which catalyst activity is high, is exposed, and therefore an electrolysis current of it increases and an unevenness of a foil thickness of copper foil growing on an opposite cathode drum is caused.
SHE) (exactly 1.632−0.0886 pH−0.0295p(HSO4−)) and so a problem that electrolysis voltage rises after electrolysis appears.
Also the following problem occurs: Fine particles of PbSO4 floating in the electrolyte adhere to the surface of the electrolytic copper foil and are embroiled in a roll of electrolytic copper foil.
However, after a lead-free solder penetrated, there is time lag up to replace to scrap copper of the lead-free and in the point of cost, it is predicted that the coexistence with the lead ion c

Method used

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  • Anode for oxygen generation and manufacturing method for the same
  • Anode for oxygen generation and manufacturing method for the same

Examples

Experimental program
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Effect test

example 1

[0098]The surface of titanium plate (JIS-I) was subjected to the dry blast with iron grit (G120 size), followed by pickling in an aqueous solution of concentrated hydrochloric acid for 10 minutes at the boiling point for cleaning treatment of the metal substrate of the electrode. The cleaned metal substrate of the electrode is set to the AIP unit applying Ti—Ta alloy target as a vapor source and a coating of tantalum and titanium alloy was applied as the AIP base layer on the surface of the metal substrate of the electrode. Coating condition is shown in Table 1.

[0099]The coated metal substrate was treated at 530° C. in an electric furnace of air circulation type for 180 minutes.

[0100]Then, the coating solution prepared by dissolving iridium tetrachloride and tantalum pentachloride in concentrated hydrochloric acid is applied on the coated metal substrate. After drying, the thermolysis coating was conducted for 15 minutes in the electric furnace of air circulation type at 370° C. to ...

example 2

[0105]The electrode for evaluation was manufactured in the same manner as with Example 1 except that post-bake was conducted in an electric furnace of air circulation type for one hour at 560° C. and the same electrolysis evaluation was performed.

[0106]The X-ray diffraction performed after post-bake showed the degree of crystallinity and crystallite diameter of IrO2 in the catalyst layer equivalent to Example 1.

[0107]As shown in Table 3, an amount of a lead adhesion to the electrode of Example 2 is one-fourth to that of the Comparative Example 1 and a suppression effect of the lead adhesion was confirmed. In addition, the accelerated electrolysis life was increased to 80% and their durability has also have been improved.

example 3

[0108]The electrode for evaluation was manufactured in the same manner as with Example 1 except that post-bake was conducted in an electric furnace of air circulation type for one hour at 600° C. and the same electrolysis evaluation was performed.

[0109]The X-ray diffraction performed after post-bake showed the degree of crystallinity and crystallite diameter of IrO2 in the catalyst layer equivalent to Example 1.

[0110]As a result of an electrolysis evaluation, as shown in Table 3, an amount of a lead adhesion and an electrolysis life was equivalent to Example 2 and a suppression effect of the lead adhesion was confirmed.

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Abstract

The present invention aims to provide an anode for oxygen generation and a manufacturing method for the same used for industrial electrolyses including manufacturing of electrolytic metal foils such as electrolytic copper foil, aluminum liquid contact and continuously electrogalvanized steel plate, and metal extraction. The present invention features an anode for oxygen generation and a manufacturing method for the same comprising a conductive metal substrate and a catalyst layer containing iridium oxide formed on the conductive metal substrate wherein the coating is baked in a low temperature region of 370° C.-400° C. in an oxidation atmosphere to form the catalyst layer containing amorphous iridium oxide and the catalyst layer containing amorphous iridium oxide is post-baked in a further high temperature region of 520° C.-600° C. in an oxidation atmosphere to crystallize almost all amount of iridium oxide in the catalyst layer.

Description

TECHNICAL FIELD[0001]The present invention relates to an anode for oxygen generation used for various industrial electrolyses and a manufacturing method for the same; more in detail, it relates to a high-load durable anode for oxygen generation and a manufacturing method for the same used for industrial electrolyses including manufacturing of electrolytic metal foils such as electrolytic copper foil, aluminum liquid contact, and continuously electrogalvanized steel plate, and metal extraction.BACKGROUND ART[0002]Mixing of lead ions in the electrolytic cell is often seen in various types of industrial electrolysis. Mixing of lead compounds in the production of electrolytic copper foil as its typical example is derived from the following two points: that is, sticking to, as a lead alloy, a scrap copper which is one of the raw materials of copper sulfate in electrolyte, and before DSE (registered trademark of Permelec Electrode Ltd.) type of electrode being used, lead-antimony electrod...

Claims

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Application Information

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IPC IPC(8): C25B11/04C25B1/02
CPCC25B1/02C25B11/0473C25B1/04Y02E60/36C25B11/081C25B11/091C25D17/10C25B11/053
Inventor CAO, YIKATO, AKIHIROHIRAO, KAZUHIROFURUSAWA, TAKASHI
Owner IND DE NORA SPA
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