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Titanium base material, method for producing titanium base material, electrode for water electrolysis, and water electrolysis device

a technology of titanium base material and titanium electrode, which is applied in the direction of electrode coating, cell components, superimposed coating process, etc., can solve the problems of insufficient corrosion resistance and degradation of the performance of current-carrying members such as electrodes, and achieve excellent conductivity and corrosion resistance

Pending Publication Date: 2020-12-31
MITSUBISHI MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a titanium base material with high conductivity and corrosion resistance, making it suitable for use in harsh environments. The method for producing this titanium base material is also provided. Additionally, an electrode made of this titanium base material and a water electrolysis device utilizing this electrode are also described.

Problems solved by technology

However, for example, in a case of using a cathode electrode of a solid polymer electrolyte fuel cell (PEFC), an anode electrode of a water electrolysis device, an electrode material for a lithium ion battery or a lithium ion capacitor, or the like in a harsh corrosive environment such as a high potential, oxygenated, strongly acidic atmosphere, there are problems in that the corrosion resistance is not sufficient and an insulative TiO2 film is formed on the surface of the titanium base material during use and the performance as a current-carrying member such as an electrode deteriorates.

Method used

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  • Titanium base material, method for producing titanium base material, electrode for water electrolysis, and water electrolysis device
  • Titanium base material, method for producing titanium base material, electrode for water electrolysis, and water electrolysis device
  • Titanium base material, method for producing titanium base material, electrode for water electrolysis, and water electrolysis device

Examples

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example 1

[0106]A description will be given below of the results of confirmation experiments performed to confirm the effects of the present invention.

[0107]First, the base material body shown in Table 1 is prepared. In Table 1, “titanium” was pure titanium having a purity of 99.9 mass % or more, and “titanium alloy” was a titanium alloy having Ti-0.15 mass % Pd.

[0108]The dimensions of each prepared base material body were width 50 mm×length 60 mm×thickness 0.3 mm.

[0109]Next, a TiO2 film is formed on the surface of the base material body. A plasma electrolytic oxidation process was carried out in an aqueous solution of K3PO4. A high-density carbon plate was used as the cathode and the above was carried out under conditions of a temperature of 100° C. or lower, a voltage of 450 V, and a time of 0 to 300 minutes. The film thickness of the TiO2 film was set to the value shown in Table 1 by adjusting the time of the plasma electrolytic oxidation process.

[0110]Next, the base material body on which...

example 2

[0126]Next, as shown in Table 3, a titanium base material (Invention Example 11) on which a Magneli phase titanium oxide film was formed and a titanium base material (Comparative Example 7) on which a titanium oxide film (insulating titanium oxide film) which was not a Magneli phase titanium oxide film was formed were each used as an anode electrode, a solid polymer water electrolysis cell (area 4 cm×4 cm) having the structure shown in FIG. 5 was formed and set as Invention Example 101 and Comparative Example 101.

[0127]In Comparative Example 102, a titanium base material on which a titanium oxide film was not formed on the surface of the base material body formed of a porous body was used as the anode electrode.

[0128]For this water electrolysis cell, a voltammetry test was carried out at 2.5 V for 1 minute and 0 V for 1 minute as one cycle. The current density flowing in the cell due to water electrolysis was measured. The test temperature was 80° C. The evaluation results are shown...

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Abstract

This titanium base material has a base material body formed of titanium or a titanium alloy, in which a Magneli phase titanium oxide film formed of a Magneli phase titanium oxide represented by a chemical formula TinO2n-1 (4≤n≤10) is formed on a surface of the base material body. Here, the Magneli phase titanium oxide film preferably contains at least one or both of Ti4O7 and Ti5O9.

Description

TECHNICAL FIELD[0001]The present invention relates to a titanium base material excellent in conductivity and corrosion resistance, a method for producing a titanium base material, an electrode for water electrolysis formed of the titanium base material, and a water electrolysis device.[0002]The present application claims priority based on Japanese Patent Application No. 2018-044659 filed in Japan on Mar. 12, 2018 and Japanese Patent Application No. 2019-042773 filed in Japan on Mar. 8, 2019 and the contents thereof are incorporated herein.BACKGROUND ART[0003]As shown in Patent Document 1 for example, titanium base materials formed of titanium or a titanium alloy are used in current-carrying members such as electrodes, in particular, in applications which require oxidation resistance (corrosion resistance).[0004]However, for example, in a case of using a cathode electrode of a solid polymer electrolyte fuel cell (PEFC), an anode electrode of a water electrolysis device, an electrode ...

Claims

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Application Information

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IPC IPC(8): C25B11/04C25B1/04
CPCC25B11/0405C25B11/0431C25B1/04C25B11/0478Y02E60/50C22C14/00C23C26/00C23C28/04C25D11/26H01M4/86H01M4/88H01M8/10C25B11/063C25B11/031C25B11/052Y02E60/36C25B11/0775C25D11/026C25B11/061C25B11/051C25B11/091
Inventor SANO, YOSUKEOHMORI, SHINICHI
Owner MITSUBISHI MATERIALS CORP
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