# US 8,148,026 B2 · Multi-layered electrode for fuel cell and method for producing the same

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- Number: US 8,148,026 B2
- Document ID: US8148026B2
- Status: Granted
- Kind: B2
- Application number: 11/883,210
- Filed: 2005-10-31
- Published: 2009-01-22
- Granted: 2012-04-03
- Earliest claimed: 2005-01-27
- Assignees: Korea Institute of Science and Technology
- Inventors: In Hwan Oh; Eun Ae Cho; Hyoung-juhn Kim; Heung Yong Ha; Seong Ahn Hong; Tae Hoon Lim; Suk-Woo Nam; Sung Pil Yoon; Jonghee Han; Jaeyoung Lee; Hyung Chul Hahm
- Web page: https://patentgrep.com/patent/US8148026B2

## CPC

- H01M 4/8657: {layered}
- H01M 4/8636: {with a gradient in another property than porosity (H01M4/861 takes precedence)}
- H01M 4/8652: {as mixture}
- H01M 4/8828: {Coating with slurry or ink}
- H01M 4/8882: {Heat treatment, e.g. drying, baking}
- H01M 8/0234: Carbonaceous material
- Y02E 60/50: Fuel cells
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

Disclosed are a multi-layered electrode for fuel cell and a method for producing the same, wherein the electrode can be operated under non-humidification and normal temperature, the flooding of the electrode catalyst layer can be prevented, and the long-term operation characteristic can be increased due to the prevention of the loss of the electrode catalyst layer.

## Claims

### Claim 1

A multi-layered electrode for fuel cell comprising:
a gas diffusing layer;
a catalyst layer located on the gas diffusing layer, the catalyst layer formed from a catalyst slurry comprising 20˜60 wt % of a Pt/C catalyst and 5 wt % or less of a first nafion ionomer with a first specific equivalent weight (EW) of 1,000˜1,300; and
a coating layer located on the catalyst layer, the coating layer formed from a solution of a second nafion ionomer with a second specific EW less than the first specific EW of the first nafion ionomer,
wherein a total quantity of the first and second nafion ionomer is 20˜50% weight of the Pt/C catalyst, and the first nafion ionomer is about 8˜33% of the total quantity of the first and second nafion ionomer.

### Claim 2 (depends on 1)

The multi-layered electrode according to claim 1, wherein the electrode is annealed at a temperature of 120˜170° C.

### Claim 3 (depends on 1)

The multi-layered electrode according to claim 1, wherein the gas diffusing layer is 20˜60 wt % PTFE carbon paper or carbon fabric.

### Claim 4 (depends on 1)

The multi-layered electrode according to claim 1, wherein the solution of the second nafion ionomer comprises 5 wt % or less of the second nafion ionomer with a second specific EW of 400˜1,000, and the second nafion ionomer is about 67˜92% of the total quantity of the first and second nafion ionomer.