Bipolar plate

Patent metadata

Field	Value
Publication number	US-11133512-B2
Application number	US-201916291313-A
Country	US
Kind code	B2
Filing date	Mar 4, 2019
Priority date	May 10, 2018
Publication date	Sep 28, 2021
Grant date	Sep 28, 2021

Abstract

A bipolar plate includes a substrate and a coating film that is formed at least on a part of a surface of the substrate. The coating film includes a phosphide having a composition represented by M 2−x Ti x P, where M is any one or more elements selected from the group consisting of Ni, Co, Fe, Mn and Cr, and 0.1≤x≤1.9. The coating film preferably includes two kinds or more of the metal elements M, and preferably has a thickness ranging from 0.05 μm or greater to 100 μm or less.

First claim

What is claimed is:

1. A bipolar plate, comprising:
a substrate; and
a coating film formed at least on a part of a surface of the substrate,
wherein the substrate has bumps and dips formed thereon to form gas channels, and
the coating film includes a phosphide having a composition represented by the following formula (1),
M 2−x Ti x P  (1)

where M is
(a) Ni, Co, or Mn,
(b) Ni and Co, Ni and Mn, Ni and Cr, Co and Fe, Co and Mn, Co and Cr, Fe and Mn, Fe and Cr, or Mn and Cr, or
(c) any three or more elements selected from the group consisting of Ni, Co, Fe, Mn and Cr, and

0.1≤x≤1.9.

2. The bipolar plate according to claim 1 , wherein the M is any one or more elements selected from the group consisting of Ni and Mn.

3. The bipolar plate according to claim 1 , wherein M is selected from (b) and (c).

4. The bipolar plate according to claim 1 , wherein 0.4≤x≤1.6.

5. The bipolar plate according to claim 1 , wherein the coating film has a thickness ranging from 0.05 μm or greater to 100 μm or less.

6. The bipolar plate according to claim 1 , wherein the substrate is made of any one of metal, carbon and polymeric materials.

7. The bipolar plate according to claim 1 , wherein the coating film is formed at least on a contact face with an electrode.

8. A polymer electrolyte fuel cell comprising the bipolar plate according to claim 1 as a separator thereof.

9. A PEM water electrolyzer comprising the bipolar plate according to claim 1 .

10. The bipolar plate according to claim 1 , wherein M is selected from (a).

11. The bipolar plate according to claim 1 , wherein M is selected from (b).

12. The bipolar plate according to claim 1 , wherein M is selected from (c).

13. The bipolar plate according to claim 1 , wherein M 2−x Ti x P is Ni 0.5 Co 0.5 TiP, Co 0.5 Fe 0.5 TiP, Fe 0.5 Mn 0.5 TiP or Mn 0.5 Cr 0.5 TiP.

Assignees

• Toyota Chuo Kenkyusho Kk

Inventors

• Wakayama Hiroaki
• Suzuki Nobuaki
• Murata Hajime
• Yamazaki Kiyoshi

Classifications

• C25B9/73

  of the filter-press type · CPC title

• H01M8/0228 Primary

  in the form of layered or coated products · CPC title

• H01M2008/1095

  Fuel cells with polymeric electrolytes · CPC title

• Y02E60/50

  Fuel cells · CPC title

• H01M8/0213

  Gas-impermeable carbon-containing materials · CPC title