# US 11,444,288 B2 · Electrode comprising organic functional metal oxide, manufacturing method therefor, membrane-electrode assembly comprising same, and fuel cell comprising membrane-electrode assembly

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- Number: US 11,444,288 B2
- Document ID: US11444288B2
- Status: Granted
- Kind: B2
- Application number: 16/323,400
- Filed: 2018-06-19
- Published: 2020-11-12
- Granted: 2022-09-13
- Earliest claimed: 2018-06-18
- Applicants: Kolon Industries, Inc.
- Inventors: Jung Ho Kim
- Web page: https://patentgrep.com/patent/US11444288B2

## CPC

- H01M 4/8663: {Selection of inactive substances as ingredients for catalytic active masses, e.g. binders, fillers}
- H01M 4/9016: {Oxides, hydroxides or oxygenated metallic salts}
- H01M 4/86: Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M 4/88: Processes of manufacture
- H01M 4/8828: {Coating with slurry or ink}
- H01M 4/8892: {Impregnation or coating of the catalyst layer, e.g. by an ionomer}
- H01M 4/90: Selection of catalytic material
- H01M 4/9008: {Organic or organo-metallic compounds}
- H01M 4/921: {Alloys or mixtures with metallic elements}
- H01M 8/1004: characterised by membrane-electrode assemblies [MEA] (H01M8/12 takes precedence)
- H01M 8/1018: Polymeric electrolyte materials
- H01M 4/926: {on carbon or graphite}
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY

## Abstract

The present invention relates to an electrode comprising organic functional metal oxides, a manufacturing method thereof, a membrane-electrode assembly including the same, and a fuel cell including the membrane-electrode assembly, and the electrode comprises a support, catalyst particles supported on the support, organic functional metal oxide nanoparticles supported on the support, and an ionomer positioned on the surface of the support. The electrode improves catalyst performance and durability in a high voltage range, can reduce the amount of a catalyst used and catalyst costs by enabling excellent current density and power density to be obtained even in a state that a relatively small amount of the catalyst is used through an increase in catalyst utilization and uniform dispersion of the catalyst, and improves performance in general and low humidification conditions.

## Claims

### Claim 1

A manufacturing method of an electrode, the manufacturing method comprising the steps of:
preparing an electrode forming composition by adding catalyst particles supported on a support, a precursor of organic functional metal oxide nanoparticles, and an ionomer to a solvent; and
manufacturing the electrode by (i) coating the electrode forming composition, and (ii) drying the coated electrode forming composition to remove the solvent therefrom,
wherein organic functional metal oxide nanoparticles are formed on the support through a sol-gel reaction of the precursor during the step of manufacturing the electrode, and
wherein the precursor is a sulfide function silane compound such that the organic functional metal oxide nanoparticles have a sulfur (S)-containing organic functional group.

### Claim 2 (depends on 1)

The manufacturing method of the electrode of claim 1, wherein (i) the ionomer has a sulfonic acid group capable of catalyzing hydrolysis of the precursor during the step of preparing the electrode forming composition, and (ii) the condensation of the hydrolyzed precursor is accelerated when the coated electrode forming composition is dried.

### Claim 3 (depends on 1)

The manufacturing method of the electrode of claim 1, wherein the precursor is any sulfide functional silane compound selected from the group consisting of bis(3-triethoxysilylpropyl)tetrasulfide, bis(2-triethoxysilylethyl)tetrasulfide, bis(4-triethoxysilylbutyl)tetrasulfide, bis(3-trimethoxysilylpropyl)tetrasulfide, bis(2-trimethoxysilylethyl)tetrasulfide, bis(4-trimethoxysilylbutyl)tetrasulfide, bis(3-triethoxysilylpropyl)trisulfide, bis(2-triethoxysilylethyl)trisulfide, bis(4-triethoxysilylbutyl)trisulfide, bis(3-trimethoxysilylpropyl)trisulfide, bis(2-trimethoxysilylethyl)trisulfide, bis(4-trimethoxysilylbutyl)trisulfide, bis(3-triethoxysilylpropyl)disulfide, bis(2-triethoxysilylethyl)disulfide, bis(4-triethoxysilylbutyl)disulfide, bis(3-trimethoxysilylpropyl)disulfide, bis(2-trimethoxysilylethyl)disulfide, and bis(4-trimethoxysilylbutyl)disulfide.

### Claim 4 (depends on 1)

The manufacturing method of the electrode of claim 1, wherein the precursor is bis(3-triethoxysilylpropyl)tetrasulfide or bis(3-triethoxysilylpropyl)disulfide.