Patent US5449799A successfully refreshed from Google Patents.
US4412935A
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Storage material for hydrogen utilizing amorphous silicon and a method for producing the same
Assignee: Siemens AG
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Filing: 1982-03-08
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Granted: 1983-11-01
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Expires: 2002-03-08
Abstract
Abstract A storage material for hydrogen comprised of amorphous silicon containing phosphorous, in addition to hydrogen (a-Si:H:P). In certain embodiments, such storage material is produced via a glow discharge plasma from a reactive gas mixture in accordance with a fluidized bed method or by quenching a phosphorous-doped silicon melt at a relatively high cooling rate. By admixing phosphorous with silicon, the absorption capacity of the resultant phosphorous-doped silicon material for hydrogen can be increased by a factor of 2 with the same production temperatures (200° C.). The storage material is useful in energy storage tanks (cheap and easily mass-produced).
Inventors
- 👤 Rolf Plaettner
- 👤 Wolfgang Kruehler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:36
CPC Classifications
C; C01; C01B; C01B3/00; C01B3/0005; C01B3/001; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/32
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
15 words
A storage material for hydrogen comprised of amorphous silicon containing phosphorous, in addition to hydrogen.
Claim 2
Dependent Claim
15 words
A storage material for hydrogen comprised of amorphous silicon containing phosphorous, in addition to hydrogen.
Claim 3
Dependent Claim
33 words
A storage material as defined in claim 1 wherein said material is produced from a silicon-containing gas and about 1 to 20% by volume, relative to said silicon-containing gas, of a phosphorous-containing gas.
Claim 4
Dependent Claim
60 words
A method of producing a storage material for hydrogen as defined in claim 1 comprising: admixing a silicon-containing gas with a phosphorous-containing gas and hydrogen to attain a reactive gas mixture, feeding said reactive gas mixture into a confined glow discharge plasma so that particles of amorphous silicon containing phosphorous, in addition to hydrogen are deposited in a reservoir therefor.
Claim 5
Dependent Claim
48 words
A method as defined in claim 3 wherein said confined glow discharge plasma is provided with a HF power density of about 1 kW/m 3 and said reactive gas mixture is maintained at a pressure less than about 10 mbar at a temperature less than about 200° C.
Claim 6
Dependent Claim
82 words
A method as defined in claim 3 wherein said silicon-containing gas is selected from the group consisting of silane (SiH 4 ), silicon tetrafluoride (SiF 4 ), silicon tetrachloride (SiCl 4 ), organic silicon compounds and mixtures thereof and said phosphorous-containing gas is selected from the group consisting of phosphorous hydride (PH 3 ), phosphorous halides, organic phosphorous compounds and mixtures thereof, said phosphorous-containing gas being present in said reactive gas mixture in an amount of about 0.5 to 5% by volume.
Claim 7
Dependent Claim
63 words
A method as defined in claim 3 wherein particle deposition occurs via a fluidized bed method whereby larger particles are separated from smaller particles by a controlled gas stream velocity which is adjusted for a desired particle size, the so-produced particles being collected in a reservoir and removed therefrom by flushing with a hydrogen gas stream and directly heaped into a storage container.
Claim 8
Dependent Claim
55 words
A method of producing a storage material for hydrogen as defined in claim 1 comprising: providing molten silicon doped with phosphorous and quenching said phosphorous-doped molten silicon at a cooling rate of about 10 7 ° K./s so that particles of amorphous silicon containing phosphorous, in addition to hydrogen, are attained in a reservoir therefor.
Claim 9
Dependent Claim
54 words
A method as defined in claim 7 wherein said molten silicon doped with phosphorous is sprayed onto a cooling metal impact plate rotating at a speed greater than about 30 m/s so that relatively thin flakes of amorphous silicon containing phosphorous, in addition to hydrogen, accumulate in a storage container as a dense heap.
Claim 10
Dependent Claim
57 words
A method as defined in claim 7 wherein said molten silicon doped with phosphorous is sprayed onto a cooled metal base positioned on a cylinder rotating at a speed greater than about 30 m/s so that relatively thin flakes of amorphous silicon containing phosphorous, in addition to hydrogen, accumulate in a storage container as a dense heap.
Claim 11
Dependent Claim
27 words
A method as defined in claim 3 or 7 wherein said particles are fed into a reservoir maintained under a hydrogen pressure of at least 6 bar.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-31 | 1987-05-02 | 1987-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-31 | 1991-05-02 | 1991-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-31 | 1995-05-02 | 1995-11-01 | $7700.00 | Window Closed / Lapsed |