CN1110868C - Preparation of thin electrodes for fuel cells - Google Patents
Preparation of thin electrodes for fuel cells Download PDFInfo
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- CN1110868C CN1110868C CN98108618A CN98108618A CN1110868C CN 1110868 C CN1110868 C CN 1110868C CN 98108618 A CN98108618 A CN 98108618A CN 98108618 A CN98108618 A CN 98108618A CN 1110868 C CN1110868 C CN 1110868C
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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Abstract
A Pt/C catalyst and PTFE are highly dispersed by the present invention, and then, an obtained mixture is sucked and filtered. Then, the mixture is transferred onto a gas diffusion layer, and is dried and sintered under the temperature of 30 to 130 DEG C in vacuum. Next, the surface of the mixture is filled with polymer electrolytes. Thus, a fuel cell thin electrode is prepared by a vacuum drying method. Because the carrying capacity of platinum of the electrode is reduced, the utilization rate of the platinum is enhanced. Thus, the fabrication cost of the electrode is obviously reduced, and the performance of the electrode is obviously enhanced. The present invention has the advantages of rapid electrode preparing process, simple and practical technology, no need of special equipment and good repeatability.
Description
The invention belongs to the preparation method of thin electrodes for fuel cells.
Polymer dielectric film fuel cell (PEMFC) has now become one of international research focus owing to have energy conversion efficiency height, noiseless, pollution-free, characteristics and wide application prospect thereof such as flexibility is big.In fuel cell, the preparation technology of electrode is one of key that influences battery performance.In fuel cell 30 years of development processes, people have successively studied and have been coated with cream method [MakotoUchida, J.Electrochem Soc, 142,2 (1995)], casting method [A.C.Ferreira, S.Srinivasan, Extd.Abs.94-1, The Electrochemical Sociaty, NJ1994], rolling process [E.J.Taylor, J.Electrochem Soc 139, L45 (1993)], electrochemical catalysis technology [M.S.Wilson, S.Gottesfeld, J Electrochem Soc, 22,1 (1992)] etc. multiple technology for preparing electrode makes battery performance obtain continuous raising.
Yet the major issue that above-mentioned these methods exist is: be metal platinum because the preparation catalyst that electrode adopted is most on the one hand, and platinum costs an arm and a leg, and resource-constrained, so the cost of PEMFC is high in the practical application.On the other hand, the thickness of electrode of method for preparing is bigger, and The model calculation shows, the effective thickness of PEMFC pole catalyze layer is about 0.4-4 μ m, if thickness is excessive, then the Catalytic Layer inner transmission matter is apart from increase, and electrode produces serious concentration polarization when causing heavy-current discharge, reduces the utilance of platinum.
The objective of the invention is to adopt and catalyst, PTFE and water are mixed method of pumping filtration prepare thin electrodes for fuel cells, thereby reduce the platinum carrying capacity of electrode, improve the utilization ratio of platinum, the electrode manufacturing cost is significantly reduced and electrode performance obviously improves.
The present invention adopts the Pt/C catalyst; add ptfe emulsion and and the distilled water mixing; disperseed 2-20 minute with supersonic generator; scattered suspension-turbid liquid is carried out suction filtration; transfer to mixture on the carbon paper equably then; at 30-130 ℃ of following vacuumize 2-24 hour; under 190-300 ℃ of argon shield sintering 1-6 hour again; filling concentration in surface is the Nafion polymer dielectric of 5wt.% then; again in 30-110 ℃ of following vacuumize 2-24 hour; polytetrafluoroethylene accounts for 10-40wt.% in the catalyst layer that obtains at last, and the Nafion polymer dielectric accounts for 5-25wt.%.
Because the present invention is with catalyst and PTFE high degree of dispersion suction filtration then, therefore catalyst granules has been distributed in the Catalytic Layer equably, and the thickness of transferring to the Catalytic Layer on the gas diffusion layers (as carbon paper) is reduced greatly and is very even, and the method can also effectively be controlled the thickness of pole catalyze layer.Experimental result shows, adopts the thin electrodes technology to prepare electrode, not only reduced the carrying capacity of noble metal catalyst significantly, and electrode performance is greatly improved also.
The present invention prepares the method for thin electrodes for fuel cells and compares and have following advantage with the various fuel cell electrode preparation methods of report in the past: (1) has reduced the platinum carrying capacity of electrode; (2) utilance of catalyst platinum improves greatly; (3) preparation process is rapid, and is easy to operation, need not special installation; (4) favorable reproducibility.
Embodiment provided by the invention is as follows:
Embodiment 1: with 10mgPt/C catalyst and concentration is that ptfe emulsion and the distilled water of 10wt.% mixes; disperseed 2 minutes with supersonic generator; suction filtration is also evenly transferred to mixture on the carbon paper; 30 ℃ of following vacuumize 12 hours; sintering is 6 hours under 190 ℃ of argon shields; it is the Nafion polymer dielectric of 5wt.% that concentration is filled on the surface; again in 30 ℃ of vacuumizes 12 hours; polytetrafluoroethylene accounts for 40wt.% in the catalyst layer that obtains at last, and the Nafion polymer dielectric accounts for 5wt.%.Assembled battery was tested after this electrode made the electrode/membrane aggregate.The electrode discharge electric current can reach 2.5-2.8A/cm
2, electrode power density can reach 1.1-1.4w/cm
2
Embodiment 2: with 5mgPt/C catalyst and concentration is that ptfe emulsion and the distilled water of 10wt.% mixes; disperseed 10 minutes with supersonic generator; suction filtration is also evenly transferred to mixture on the carbon paper; 70 ℃ of following vacuumize 24 hours; sintering is 3 hours under 250 ℃ of argon shields; it is the Nafion polymer dielectric of 5wt.% that concentration is filled on the surface; again in 70 ℃ of vacuumizes 24 hours; polytetrafluoroethylene accounts for 30wt.% in the catalyst layer that obtains at last, and the Nafion polymer dielectric accounts for 12wt.%.Assembled battery was tested after this electrode made the electrode/membrane aggregate.The electrode discharge electric current can reach 2.7-3.1A/cm
2, electrode power density can reach 1.2-1.5w/cm
2
Embodiment 3: with 2.5mgPt/C catalyst and concentration is that ptfe emulsion and the distilled water of 25wt.% mixes; disperseed 20 minutes with supersonic generator; suction filtration is also evenly transferred to mixture on the carbon paper; 130 ℃ of following vacuumize 2 hours; sintering is 1 hour under 300 ℃ of argon shields; it is the Nafion polymer dielectric of 5wt.% that concentration is filled on the surface; again in 110 ℃ of vacuumizes 2 hours; polytetrafluoroethylene accounts for 10wt.% in the catalyst layer that obtains at last, and the Nafion polymer dielectric accounts for 25wt.%.Assembled battery was tested after this electrode made the electrode/membrane aggregate.The electrode discharge electric current can reach 2.6-2.9A/cm
2, electrode power density can reach 1.1-1.5w/cm
2
Claims (1)
1. the preparation method of a thin electrodes for fuel cells; it is characterized in that adopting the Pt/C catalyst; add ptfe emulsion and and the distilled water mixing; disperseed 2-20 minute with supersonic generator; scattered suspension-turbid liquid is carried out suction filtration; transfer to mixture on the carbon paper equably then; at 30-130 ℃ of following vacuumize 2-24 hour; under 190-300 ℃ of argon shield sintering 1-6 hour again; filling concentration in surface is the Nafion polymer dielectric of 5wt.% then; in 30-110 ℃ of following vacuumize 2-24 hour, polytetrafluoroethylene accounted for 10-40wt.% in the catalyst layer that obtains at last again, and the Nafion polymer dielectric accounts for 5-25wt.%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98108618A CN1110868C (en) | 1998-05-09 | 1998-05-09 | Preparation of thin electrodes for fuel cells |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98108618A CN1110868C (en) | 1998-05-09 | 1998-05-09 | Preparation of thin electrodes for fuel cells |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1235384A CN1235384A (en) | 1999-11-17 |
| CN1110868C true CN1110868C (en) | 2003-06-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98108618A Expired - Fee Related CN1110868C (en) | 1998-05-09 | 1998-05-09 | Preparation of thin electrodes for fuel cells |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1110868C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100375320C (en) * | 2004-09-01 | 2008-03-12 | 中国科学院大连化学物理研究所 | Proton exchange membrane fuel cell multi-layer membrane electrode structure and its preparing method |
| CN100432141C (en) * | 2006-01-24 | 2008-11-12 | 大连理工大学 | Device and method for preparing polytetrafluoro ethylene-carbon powder nano composite material |
| CN106898500A (en) * | 2015-12-18 | 2017-06-27 | 中国科学院大连化学物理研究所 | A kind of bifunctional electrodes and preparation and generator unit |
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1998
- 1998-05-09 CN CN98108618A patent/CN1110868C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1235384A (en) | 1999-11-17 |
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