US5068161A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst material
Assignee: Johnson Matthey PLC
•
Filing: 1990-03-30
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Granted: 1991-11-26
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Expires: 2010-03-30
Abstract
Abstract An electrocatalytic material comprises an alloy of platinum with another element, supported on a conductive carbon support, the platinum loading being at 20 to 60 wt % and the ECA of the alloy being greater than 35 m 2 /g, is especially suitable for use in phosphoric acid fuel cells, and demonstrates unexpectedly high performance with high Pt loadings.
Inventors
- 👤 Lindsey Keck
- 👤 Jeffrey Buchanan
- 👤 Graham A. Hards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:11
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/90; H01M4/92; H01M4/925; H01M4/926; B; B01; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/42; B01J23/70; B01J23/89; H01M2004/8678; H01M2004/8689; H01M2300/00; H01M2300/0002; H01M2300/0005; H01M2300/0008; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
41 words
An electrocatalytic material comprising an alloy of platinum supported on a conductive carbon support, the platinum loading being in the range of 20 to 60 wt %, and the ECA of the alloy being greater than 35 m 2 /g Pt.
Claim 2
Dependent Claim
41 words
An electrocatalytic material comprising an alloy of platinum supported on a conductive carbon support, the platinum loading being in the range of 20 to 60 wt %, and the ECA of the alloy being greater than 35 m 2 /g Pt.
Claim 3
Dependent Claim
26 words
A material as claimed in claim 1, in which the alloying element is one or more selected from Groups IVB, VIB, VIIB, VIII, IB, and IIIA.
Claim 4
Dependent Claim
28 words
A material as claimed in claim 2, in which the alloying element is one or more of Ti, Cr, Mn, Fe, Co, Ni, Cu, Ga, Zr and Hf.
Claim 5
Dependent Claim
22 words
A material as claimed in claim 3, in which the alloying element is one or more of Cr, Mn, Co and Ni.
Claim 6
Dependent Claim
23 words
A material as claimed in claim 1, in which the BET surface area of the catalyst is less than 1,000 m 2 /g.
Claim 7
Dependent Claim
23 words
A material as claimed in claim 5, in which the BET surface area of the catalyst is less than 300 m 2 /g.
Claim 8
Dependent Claim
23 words
A material as claimed in claim 6, in which the BET surface area of the catalyst is less than 120 m 2 /g.
Claim 9
Dependent Claim
26 words
A material as claimed in claim 1, in which the atomic ratio of Pt to the alloying element(s) is in the range of 80:20 to 20:80.
Claim 10
Dependent Claim
26 words
A material as claimed in claim 8, in which the atomic ratio of Pt to the alloying element(s) is in the range of 65:35 to 35:65.
Claim 11
Dependent Claim
21 words
A material as claimed in claim 9, in which the atomic ratio of Pt to the alloying element(s) is approximately 50:50.
Claim 12
Dependent Claim
23 words
A material as claimed in claim 1, in which the loading of platinum metal is in the range 20 to 45 wt %.
Claim 13
Dependent Claim
23 words
A material as claimed in claim 11, in which the loading of platinum metal is in the range 20 to 40 wt %.
Claim 14
Dependent Claim
24 words
A material as claimed in claim 12, in which the loading of platinum metal is in the range of 25 to 35 wt %.
Claim 15
Dependent Claim
22 words
A material as claimed in claim 1, in which the ECA of the alloy is greater than 40 m 2 /g Pt.
Claim 16
Dependent Claim
22 words
A material as claimed in claim 14, in which the ECA of the alloy is greater than 45 m 2 /g Pt.
Claim 17
Dependent Claim
83 words
A method for the production of an electrocatalytic material as claimed in claim 1, comprising depositing from basic solution compounds of platinum and one or more alloying elements, onto a conductive carbon electrocatalyst support to deposit a total amount of platinum of 20 to 60 wt % on the support, and reducing and heat treating the support carrying the compounds to obtain an alloy of platinum and at least one other element, of ECA in excess of 35 m 2 /g of platinum.
Claim 18
Dependent Claim
25 words
A method as claimed in claim 16, wherein the compounds are dissolved in water, and are added to an aqueous basic slurry of the carbon.
Claim 19
Dependent Claim
12 words
A catalysed electrode comprising an electrocatalytic material as claimed in claim 1.
Claim 20
Dependent Claim
12 words
A fuel cell comprising a catalysed electrode as claimed in claim 18.
Claim 21
Dependent Claim
22 words
A fuel cell as claimed in claim 19, wherein the said catalysed electrode is the cathode and the electrolyte is phosphoric acid.
Claim 22
Dependent Claim
19 words
The method of claim 16, wherein platinum is first deposited onto said support, then said alloying element is deposited.
Claim 23
Dependent Claim
19 words
The method of claim 16, wherein platinum is deposited onto said support after said alloying element is deposited thereon.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-11-25 | 1995-05-27 | 1995-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-25 | 1999-05-27 | 1999-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-25 | 2003-05-27 | 2003-11-26 | $7700.00 | Window Closed / Lapsed |