Platinum-coated polyimide particles and articles thereof

Patent metadata

Field	Value
Publication number	US-2021242480-A1
Application number	US-201917049751-A
Country	US
Kind code	A1
Filing date	Apr 29, 2019
Priority date	May 1, 2018
Publication date	Aug 5, 2021
Grant date	—

Abstract

Described herein is a composition comprising: a plurality of particles, wherein the particles comprise a polyimide core; and a coating thereon, wherein the coating comprises at least one of a metallic platinum and a platinum oxide. Such compositions may be used as a polymer electrolyte membrane for electrochemical cells, including fuel cells or water electrolyzers.

First claim

1 . A composition comprising:
a plurality of particles, wherein the particles comprise a polyimide core; and a coating thereon, wherein the coating comprises at least one of a metallic platinum and a platinum oxide.

2 . The composition of claim 1 wherein the particles are substantially spherical.

3 . The composition of claim 1 , wherein the particles have an average diameter of less than 10 micrometers.

4 . The composition of claim 1 , wherein the coating has an average thickness of less than 25 nm.

5 . The composition of claim 1 , wherein the coating is not continuous.

6 . The composition of claim 1 , wherein the coating comprises discrete regions of platinum having an average diameter of no more than 10 nanometers.

7 . The composition of claim 1 , wherein the plurality of particles comprise at least 0.18 and at most 72% by weight of at least one of metallic platinum or platinum oxide calculated as elemental platinum.

8 . The composition of claim 1 , wherein the polyimide comprises at least one of the following monomeric units:

9 . A polymer electrolyte membrane comprising:
the composition of claim 1 , wherein the composition is dispersed within an ion-conductive polymer.

10 . The polymer electrolyte membrane of claim 9 , wherein a first ion-conductive layer is disposed on a first major surface of the polymer electrolyte membrane and optionally, wherein the first ion-conductive layer comprises a plurality of polyimide particles.

11 . A membrane electrode assembly comprising a positive electrode, a negative electrode and the polymer electrolyte membrane of claim 9 disposed therebetween.

12 . A water electrolyzer comprising the membrane electrode assembly of claim 11 .

13 . A fuel cell comprising the membrane electrode assembly of claim 11 .

14 . A method of generating hydrogen and oxygen from water, the method comprising:
providing a water electrolyzer of claim 12 ; providing water in contact with the electrode; and providing an electrical potential difference across the membrane with sufficient current to convert at least a portion of the water to hydrogen and oxygen on the cathode and anode, respectively.

15 . A method of generating electricity from hydrogen and oxygen, the method comprising:
providing a fuel cell of claim 13 ; providing hydrogen in contact with the anode and oxygen in contact with the cathode; and generating an electrical potential difference across the membrane with sufficient current to convert at least a portion of the hydrogen and oxygen to water.

16 . The composition of claim 1 , wherein the coating consists essentially of at least one of metallic platinum and platinum oxide.

17 . The composition of claim 1 , wherein the coating is disposed directly on the surface of the core.

18 . The polymer electrolyte membrane of claim 9 , wherein the ion-conductive polymer comprises a side group of —RfSO 2 Y wherein Rf is a branched or non-branched perfluoroalkyl group, perfluoroalkoxy group or perfluoroether group; and Y is —OH, —NHSO 2 —R f ″ , —NHSO 2 —R f ′ —SO 3 H, —NHSO 2 —R f ′ —SO 2 —NH—SO 2 —R, where R f ″ is a fluorinated alkyl group, R f ′ is a fluorinated alkylene group, and R is a fluorinated alkyl group or a nonfluorinated alkyl or aryl group.

19 . The polymer electrolyte membrane of claim 9 , wherein the polymer electrolyte membrane comprises a weight % of the composition to the ion-conductive polymer of at least 0.05% and no more than 50%.

Assignees

• 3M Innovative Properties Co

Inventors

• Park Jiyoung
• Bedoya Cedric
• David Moses M
• Lewinski Krzysztof A

Classifications

• Y02E60/36

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

• H01M2300/0094

  in the form of layered products, e.g. coatings · CPC title

• H01M2300/0091

  in the form of mixtures · CPC title

• H01M8/1053

  consisting of layers of polymers with at least one layer being ionically conductive · CPC title

• H01M8/1051 Primary

  Non-ion-conducting additives, e.g. stabilisers, SiO2 or ZrO2 · CPC title