Electrode, electrochemical cell, electrochemical apparatus and method for manufacturing electrode

Patent metadata

Field	Value
Publication number	US-2017204526-A1
Application number	US-201615259414-A
Country	US
Kind code	A1
Filing date	Sep 8, 2016
Priority date	Jan 19, 2016
Publication date	Jul 20, 2017
Grant date	—

Abstract

An electrode of an embodiment includes a substrate, an intermediate layer provided on the substrate, and a catalyst layer provided on the intermediate layer. The intermediate layer is a mixture that includes two or more substances among a compound, and single element of noble metal or an alloy including noble metal. In a composition ratio of the mixture, a composition ratio of the intermediate layer in the vicinity of an interface between the substrate and the intermediate layer is different from a composition ratio of the intermediate layer in the vicinity of an interface between the catalyst layer and the intermediate layer.

First claim

What is claimed is:

1 . An electrode comprising a substrate, an intermediate layer provided on the substrate, and a catalyst layer provided on the intermediate layer, wherein
the intermediate layer is a mixture that includes two or more substances among a compound, and single element of noble metal or an alloy including noble metal, and in a composition ratio of the mixture, a composition ratio of the intermediate layer in the vicinity of an interface between the substrate and the intermediate layer is different from a composition ratio of the intermediate layer in the vicinity of an interface between the catalyst layer and the intermediate layer.

2 . The electrode according to claim 1 , wherein the catalyst layer includes at least one substance among iridium oxide, ruthenium oxide, tantalum oxide, titanium oxide, platinum, and platinum oxide.

3 . The electrode according to claim 1 , wherein the mixture includes at least one substance in the group A and at least one substance in the group B below:
group A: iridium oxide, ruthenium oxide and gold; group B: valve metal oxide, and platinum.

4 . The electrode according to claim 3 , wherein when an amount of a substance of the group B in the vicinity of the interface with the substrate is denoted by B 1 , and an amount of a substance of the group B in the vicinity of the interface with the catalyst layer is denoted by B 2 , the relationship B 1 >B 2 is satisfied.

5 . The electrode according to claim 3 , wherein
the vicinity of the interface with the substrate is a region in the intermediate layer located within a thickness of 0.1×L, when L denotes a thickness of the intermediate layer, to the catalyst layer from the interface between the substrate and the intermediate layer, and a composition ratio of a substance of the group A present in the vicinity of the interface with the substrate is greater than 0% and less than or equal to 10%. present in, the region is meant by the vicinity of the interface with the substrate 1 A, a region in the intermediate layer 1 C located within a thickness of 0.1×L (L denotes a thickness of the intermediate layer 1 C) to the catalyst layer 1 B from the interface between the substrate 1 A and the intermediate layer 1 C

6 . The electrode according to claim 1 , wherein a thickness of the intermediate layer is from 10 nm or more to 500 nm or less.

7 . The electrode according to claim 1 , wherein the catalyst layer has a laminated structure including an aggregate layer and a gap layer.

8 . The electrode according to claim 7 , wherein a thickness of the aggregate layer is from 4 nm or more to 30 nm or less.

9 . The electrode according to claim 1 , wherein a thermal expansion coefficient in the vicinity of the interface between the substrate and the intermediate layer is different from a thermal expansion coefficient in the vicinity of an interface between the catalyst layer and the intermediate layer.

10 . An electrochemical cell that includes the electrode according to claim 1 .

11 . An electrochemical apparatus that includes the electrochemical cell according to claim 10 .

12 . A method for manufacturing an electrode that comprises a substrate, an intermediate layer provided on the substrate, and a catalyst layer provided on the intermediate layer, the method comprising:
forming the intermediate layer on the substrate by performing sputtering, the intermediate layer being a mixture that includes two or more substances among a compound, and single element of noble metal or an alloy including noble metal, forming a mixed layer including a pore forming material and a catalyst material on the intermediate layer by performing the sputtering, and dissolving the pore forming material from the mixed layer by using an acidic solution to obtain the catalyst layer.

Assignees

• Toshiba Kk

Inventors

• Yoshinaga Norihiro
• Matake Shigeru
• Mei Wu
• Iida Atsuko

Classifications

• C25B11/031

  Porous electrodes · CPC title

• C25B11/035

  Chemistry & Metallurgy · mapped topic

• C25B11/0484 Primary

  Chemistry & Metallurgy · mapped topic

• C23C14/34

  Sputtering · CPC title

• C25B11/0494

  Chemistry & Metallurgy · mapped topic