Catalyst material for a fuel cell or an electrolyser and associated production method

Patent metadata

Field	Value
Publication number	US-11362340-B2
Application number	US-201917040942-A
Country	US
Kind code	B2
Filing date	Apr 11, 2019
Priority date	Apr 13, 2018
Publication date	Jun 14, 2022
Grant date	Jun 14, 2022

Abstract

The invention relates to a multi-component catalyst material for use in a fuel cell or electrolysis system, in particular in a regenerative fuel cell or reversible electrolyser.According to the invention, the catalyst material comprises a doped manganese oxide, a NiFe intercalation compound and a conductive carrier material, wherein the doped manganese oxide and the NiFe intercalation compound are supported on the carrier material.

First claim

The invention claimed is:

1. A catalyst material for a fuel cell or an electrolyser, comprising a multi-component system including
a manganese oxide doped with a dopant M,
a NiFe intercalation compound, and
a conductive carbon-containing carrier material on which the doped manganese oxide and the NiFe intercalation compound are directly or indirectly arranged.

2. The catalyst material according to claim 1 , wherein the doped manganese oxide is a cryptomelane-type manganese dioxide according to the formula M:α-MnO 2 .

3. The catalyst material according to claim 1 , wherein the dopant M is selected from the group of iron, nickel, copper, silver and/or cobalt.

4. The catalyst material according to claim 1 , wherein the dopant M is contained in the manganese oxide in a proportion in the range from 0.1 to 3.5 wt %, in particular in the range from 0.2 to 3.35 wt %.

5. The catalyst material according to claim 1 , wherein the NiFe intercalation compound is a NiFe LDH, which in particular has 1.5 to 5 times the proportion by weight of nickel in relation to iron.

6. The catalyst material according to claim 1 , wherein the NiFe intercalation compound is a NiFe intercalation compound modified by anion exchange.

7. The catalyst material according to claim 1 , wherein the conductive carbon-containing carrier material is selected from carbon black, graphene, nanostructured carbon, carbon nanotubes and/or a carbonised carrier particle.

8. The catalyst material according to claim 1 , wherein the conductive carbon-containing carrier material is modified by oxygen, nitrogen and/or phosphorus.

9. The catalyst material according to claim 1 , wherein the NiFe intercalation compound is grown directly on the conductive carbon-containing carrier material.

10. An electrode, in particular an oxygen electrode, for a fuel cell or an electrolyser, including a catalyst material according to claim 1 .

11. A fuel cell, an electrolyser, a regenerative fuel cell or a reversible electrolyser including an ion exchange membrane which is coated at least on one side with a catalyst material according to claim 1 .

12. A method for producing a catalyst material according to claim 1 , comprising the following steps in the specified order:
preparing a mixture of a doped manganese oxide, a NiFe intercalation compound and a conductive carbon-containing carrier material by means of blending,
preparing a catalyst dispersion from the mixture by adding water, an organic solvent and optionally a binder, and
applying the catalyst dispersion to a substrate.

13. The method according to claim 12 , wherein there are 70 to 80 parts by weight of water, 15 to 25 parts by weight of the organic solvent and 2 to 5 parts by weight of the binder in relation to the sum of the components water, organic solvent and binder, or there are 0.5 to 5 parts by weight of water and 95 to 98.5 parts by weight of the organic solvent in relation to the sum of the components water and organic solvent, and the solids and the binder are present in a ratio from 5:3 to 7:3 in the mixture of water and the organic solvent.

14. The method according to claim 12 , wherein the binder is a perfluorinated sulfonic acid polymer and/or a quaternary ammonium compound, in particular a doped polysulfone.

15. The method according to claim 12 , wherein the substrate is a gas diffusion layer or a membrane, in particular an ion exchange membrane.

Assignees

• Univ Berlin Tech

Inventors

• Dresp Sören
• Klingenhof Malte
• Strasser Peter

Classifications

• H01M4/8652 Primary

  as mixture · CPC title

• H01M4/9041

  Metals or alloys (H01M4/92 takes precedence) · CPC title

• H01M2008/1095

  Fuel cells with polymeric electrolytes · CPC title

• C25B9/23

  comprising ion-exchange membranes in or on which electrode material is embedded · CPC title

• H01M4/9016 Primary

  Oxides, hydroxides or oxygenated metallic salts · CPC title