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

Patent metadata

Field	Value
Publication number	US-2020407858-A1
Application number	US-201916979002-A
Country	US
Kind code	A1
Filing date	Mar 12, 2019
Priority date	Mar 12, 2018
Publication date	Dec 31, 2020
Grant date	—

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 Ti n O 2n-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 Ti 4 O 7 and Ti 5 O 9 .

First claim

1 . A titanium base material comprising:
a base material body formed of titanium or a titanium alloy, wherein a Magneli phase titanium oxide film formed of a Magneli phase titanium oxide represented by a chemical formula Ti n O 2n-1 (4≤n≤10) is formed on a surface of the base material body.

2 . The titanium base material according to claim 1 ,
wherein the Magneli phase titanium oxide film contains at least one or both of Ti 4 O 7 and Ti 5 O 9 .

3 . The titanium base material according to claim 1 ,
wherein the Magneli phase titanium oxide film has a film thickness in a range of 0.1 μm or more and 30 μm or less.

4 . The titanium base material according to claim 1 ,
wherein the base material body is a porous body having a porosity in a range of 30% or more and 97% or less.

5 . The titanium base material according to claim 1 ,
wherein the Magneli phase titanium oxide film has a porous structure.

6 . A method for manufacturing the titanium base material according to claim 1 , the method comprising:
a TiO 2 film forming step of forming a TiO 2 film on a surface of a base material body formed of titanium or a titanium alloy; and a reduction process step of reducing the TiO 2 film formed on the surface of the base material body by a microwave plasma reduction method to obtain a Magneli phase titanium oxide film formed of a Magneli phase titanium oxide represented by a chemical formula Ti n O 2n-1 (4≤n≤10), wherein the reduction process step is carried out under conditions of a substrate temperature of 400° C. or lower and a process time of 15 minutes or less.

7 . An electrode for water electrolysis, comprising:
the titanium base material according to claim 1 .

8 . The electrode for water electrolysis according to claim 7 ,
wherein, in a voltammetry test in which one cycle is denoted by a holding time of 1 minute at 2.5 V and 1 minute at 0 V, an electrolysis efficiency after 1,200 cycles is 90% or more of an initial value.

9 . A water electrolysis device comprising:
the electrode for water electrolysis according to claim 7 .

Assignees

• Mitsubishi Materials Corp

Inventors

• Sano Yosuke
• Ohmori Shinichi

Classifications

• C25D11/26

  of refractory metals or alloys based thereon · CPC title

• C25D11/026

  Anodisation with spark discharge · CPC title

• C25B11/0775

  of the rutile type · CPC title

• Y02E60/36

  Hydrogen production from non-carbon containing sources, e.g. by water electrolysis · CPC title

• C25B11/052

  Electrodes comprising one or more electrocatalytic coatings on a substrate · CPC title