# US 7,608,560 B2 · Platinum-titanium-tungsten fuel cell catalyst

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- Number: US 7,608,560 B2
- Document ID: US7608560B2
- Status: Granted
- Kind: B2
- Application number: 10/559,720
- Filed: 2004-06-07
- Published: 2007-02-22
- Granted: 2009-10-27
- Earliest claimed: 2003-06-06
- Assignees: Symyx Technologies, Inc.; Honda Giken Kogyo Kabushiki Kaisha
- Inventors: Qun Fan; Peter Strasser; Alexander Gorer; Martin Devenney; Ting He; Hiroyuki Oyanagi; Daniel M. Giaquinta; Kenta Urata; Hiroichi Fukuda; Konstantinos Chondroudis; Keith James Cendak
- Web page: https://patentgrep.com/patent/US7608560B2

## CPC

- H01M 4/921: {Alloys or mixtures with metallic elements}
- B01J 23/6527: {Tungsten}
- C22C 5/04: Alloys based on a platinum group metal
- C22C 14/00: Alloys based on titanium
- C22C 27/04: Alloys based on tungsten or molybdenum
- C22C 30/00: Alloys containing less than 50% by weight of each constituent
- H01M 4/92: Metals of platinum group (H01M4/94 {, H01M4/9058} take precedence)
- H01M 4/925: {supported on carriers, e.g. powder carriers}
- B01J 21/063: {Titanium; Oxides or hydroxides thereof}
- B01J 21/18: Carbon
- Y02E 60/50: Fuel cells
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A fuel cell catalyst comprising platinum, titanium and tungsten. In one or more embodiments, the concentration of platinum is less than 60 atomic percent, and/or the concentration of titanium is at least 20 atomic percent, and/or the concentration of tungsten is at least 25 atomic percent.

## Claims

### Claim 1

A catalyst for use in oxidation or reduction reactions, the catalyst comprising platinum, titanium, and tungsten, wherein the platinum concentration is between about 30 and about 50 atomic percent, the titanium concentration is no greater than about 20 atomic percent, and the tungsten concentration is between about 40 and about 60 atomic percent.

### Claim 2 (depends on 1)

The catalyst of claim 1 wherein the platinum concentration is between about 35 and about 45 atomic percent, the titanium concentration is between about 5 and about 15 atomic percent, and the tungsten concentration is between about 45 and about 55 atomic percent.

### Claim 3 (depends on 2)

The catalyst of claim 2 consisting essentially of platinum, titanium and tungsten.

### Claim 4 (depends on 2)

The catalyst of claim 2 wherein the catalyst comprises an alloy of platinum, titanium and tungsten.

### Claim 5 (depends on 2)

The catalyst of claim 2 wherein the catalyst consists essentially of an alloy of platinum, titanium and tungsten.

### Claim 6 (depends on 2)

A supported electrocatalyst powder for use in electrochemical reactor devices, the supported electrocatalyst powder comprising the catalyst of claim 2 and electrically conductive support particles upon which the catalyst is dispersed.

### Claim 7 (depends on 1)

The catalyst of claim 1 wherein the titanium concentration is between about 2 and about 12 atomic percent.

### Claim 8 (depends on 1)

The catalyst of claim 1 consisting essentially of platinum, titanium and tungsten.

### Claim 9 (depends on 1)

The catalyst of claim 1 wherein the catalyst comprises an alloy of platinum, titanium and tungsten.

### Claim 10 (depends on 1)

The catalyst of claim 1 wherein the catalyst consists essentially of an alloy of platinum, titanium and tungsten.

### Claim 11 (depends on 1)

A supported electrocatalyst powder for use in electrochemical reactor devices, the supported electrocatalyst powder comprising the catalyst of claim 1 and electrically conductive support particles upon which the catalyst is dispersed.

### Claim 12

A catalyst for use in oxidation or reduction reactions, the catalyst comprising platinum, titanium, and tungsten, wherein the platinum concentration is between about 20 and about 40 atomic percent, the titanium concentration is between about 25 and about 45 atomic percent, and the tungsten concentration is between about 30 and about 50 atomic percent.

### Claim 13 (depends on 12)

The catalyst of claim 12 wherein the platinum concentration is between about 25 and about 35 atomic percent, the titanium concentration is between about 30 and about 40 atomic percent, and the tungsten concentration is between about 35 and about 45 atomic percent.

### Claim 14 (depends on 13)

The catalyst of claim 13 consisting essentially of platinum, titanium and tungsten.

### Claim 15 (depends on 13)

The catalyst of claim 13 wherein the catalyst comprises an alloy of platinum, titanium and tungsten.

### Claim 16 (depends on 13)

The catalyst of claim 13 wherein the catalyst consists essentially of an alloy of platinum, titanium and tungsten.

### Claim 17 (depends on 13)

A supported electrocatalyst powder for use in electrochemical reactor devices, the supported electrocatalyst powder comprising the catalyst of claim 13 and electrically conductive support particles upon which the catalyst is dispersed.

### Claim 18 (depends on 12)

The catalyst of claim 12 consisting essentially of platinum, titanium and tungsten.

### Claim 19 (depends on 12)

The catalyst of claim 12 wherein the catalyst comprises an alloy of platinum, titanium and tungsten.

### Claim 20 (depends on 12)

The catalyst of claim 12 wherein the catalyst consists essentially of an alloy of platinum, titanium and tungsten.

### Claim 21 (depends on 12)

A supported electrocatalyst powder for use in electrochemical reactor devices, the supported electrocatalyst powder comprising the catalyst of claim 12 and electrically conductive support particles upon which the catalyst is dispersed.

### Claim 22

A catalyst for use in oxidation or reduction reactions, the catalyst comprising platinum, titanium, and tungsten, wherein the platinum concentration is between about 15 and about 45 atomic percent, the titanium concentration is between about 40 and about 75 atomic percent, and the tungsten concentration is between about 5 and about 20 atomic percent.

### Claim 23 (depends on 22)

The catalyst of claim 22 wherein the platinum concentration is between about 20 and about 45 atomic percent.

### Claim 24 (depends on 22)

The catalyst of claim 22 wherein the platinum concentration is between about 20 and about 40 atomic percent, the titanium is at a concentration is between about 50 and about 65 atomic percent, and the tungsten is at a concentration is between about 5 and about 15 atomic percent.

### Claim 25 (depends on 24)

The catalyst of claim 24 consisting essentially of platinum, titanium and tungsten.

### Claim 26 (depends on 24)

The catalyst of claim 24 wherein the catalyst comprises an alloy of platinum, titanium and tungsten.

### Claim 27 (depends on 24)

The catalyst of claim 24 wherein the catalyst consists essentially of an alloy of platinum, titanium and tungsten.

### Claim 28 (depends on 24)

A supported electrocatalyst powder for use in electrochemical reactor devices, the supported electrocatalyst powder comprising the catalyst of claim 24 and electrically conductive support particles upon which the catalyst is dispersed.

### Claim 29 (depends on 22)

The catalyst of claim 22 consisting essentially of platinum, titanium and tungsten.

### Claim 30 (depends on 22)

The catalyst of claim 22 wherein the catalyst comprises an alloy of platinum, titanium and tungsten.

### Claim 31 (depends on 22)

The catalyst of claim 22 wherein the catalyst consists essentially of an alloy of platinum, titanium and tungsten.

### Claim 32 (depends on 22)

A supported electrocatalyst powder for use in electrochemical reactor devices, the supported electrocatalyst powder comprising the catalyst of claim 22 and electrically conductive support particles upon which the catalyst is dispersed.