Electrode, membrane electrode assembly, electrochemical cell, and stack

Patent metadata

Field	Value
Publication number	US-2017183788-A1
Application number	US-201615262310-A
Country	US
Kind code	A1
Filing date	Sep 12, 2016
Priority date	Dec 25, 2015
Publication date	Jun 29, 2017
Grant date	—

Abstract

An electrode of an embodiment includes a base material, and a catalyst layer provided on the base material and having a porous structure. When a sum of heights of all peaks belonging to Ir oxide is I0, the height of a peak of IrO 2 (110) is T1, and the height of a peak of IrO 2 (211) is I2, a ratio of (I1+I2)/I0, which is a ratio of spectra obtained by X-ray diffraction measurements using Kα rays of Cu in the catalyst layer, is 50% or more and 100% or less in a range of a diffraction angle of 20 degrees or more and 70 degrees or less.

First claim

What is claimed is:

1 . An electrode comprising:
a base material; and a catalyst layer provided on the base material and having a porous structure, wherein when a sum of heights of all peaks belonging to Ir oxide is I0, the height of a peak of IrO 2 (110) is I1, and the height of a peak of IrO 2 (211) is I2, a ratio of (I1+I2)/I0, which is a ratio of spectra obtained by X-ray diffraction measurements using Ka rays of Cu in the catalyst layer, is 50% or more and 100% or less in a range of a diffraction angle of 20 degrees or more and 70 degrees or less.

2 . The electrode according to claim 1 , wherein when the sum of heights of all peaks belonging to Ir metal is I3, the ratio of I3/I0, which is the ratio of spectra, is 0% or more and 5% or less.

3 . The electrode according to claim 1 , wherein a crystallite size of the catalyst layer is 2 nm or more and 15 nm or less.

4 . The electrode according to claim 1 , wherein a porosity of the catalyst layer is 50 vol % or more and 95 vol % or less.

5 . The electrode according to claim 1 , wherein a thickness of the catalyst layer is 2 nm or more and 500 nm or less.

6 . The electrode according to claim 1 , wherein the catalyst layer has a laminated structure of one layer or more and 30 layers or less.

7 . The electrode according to claim 1 , wherein the catalyst layer includes Ir oxide.

8 . The electrode according to claim 1 , wherein the catalyst layer further includes a noble metal or noble metal oxide including at least one noble metal element selected from the group consisting of; Pt, Ru, Rh, Os, Pd and Au.

9 . The electrode according to claim 1 , wherein the catalyst layer further includes a non-noble metal or an oxide including at least one element selected from the group consisting of; Ni, Fe, Mn, Al, Zn, Ta, W, Hf, Si, Mo, Ti, Zr, Nb, V, Cr, and Sn.

10 . A membrane electrode assembly including the electrode according to claim 1 .

11 . An electrochemical cell including the membrane electrode assembly according to claim 10 .

12 . A stack including the electrochemical cell according to claim 11 .

Assignees

• Toshiba Kk

Inventors

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

Classifications

• C25B11/0415

  Chemistry & Metallurgy · mapped topic

• C25B11/0484

  Chemistry & Metallurgy · mapped topic

• C23C14/34

  Sputtering · CPC title

• C23C14/08

  Oxides (C23C14/10 takes precedence) · CPC title

• C25B11/0447 Primary

  Chemistry & Metallurgy · mapped topic