Method for producing a catalyst for fuel cells
US-2015318560-A1 · Nov 5, 2015 · US
Method for producing fine catalyst particles and method for producing carbon-supported catalyst
US9950314B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9950314-B2 |
| Application number | US-201515303877-A |
| Country | US |
| Kind code | B2 |
| Filing date | Apr 3, 2015 |
| Priority date | Apr 18, 2014 |
| Publication date | Apr 24, 2018 |
| Grant date | Apr 24, 2018 |
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- Title
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Abstract
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The present invention is to provide fine catalyst particles to which sulfate ions are less likely to be adsorbed, and a carbon-supported catalyst to which sulfate ions are less likely to be adsorbed. Disclosed is a method for producing fine catalyst particles comprising a fine palladium-containing particle and a platinum-containing outermost layer covering at least part of the fine palladium-containing particle, wherein the method comprises: a copper covering step of covering at least part of the fine palladium-containing particle with copper by preparing a second dispersion by mixing a first dispersion comprising fine palladium-containing particles being dispersed in an acid solution with a copper-containing solution, and applying a potential that is nobler than the oxidation reduction potential of copper to the fine palladium-containing particles in the second dispersion, and a platinum covering step of covering at least part of the fine palladium-containing particle with platinum by substituting the copper covering at least part of the fine palladium-containing particle with platinum by mixing the second dispersion and a platinum-containing solution after the copper covering step, with applying a constant potential that is in a range between a potential that is nobler than the oxidation reduction potential of copper and a potential that is less than the oxidation reduction potential of platinum, to the fine palladium-containing particles.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method for producing fine catalyst particles comprising a fine palladium-containing particle and a platinum-containing outermost layer covering at least part of the fine palladium-containing particle, wherein the method comprises: a copper covering step of covering at least part of the fine palladium-containing particle with copper by preparing a second dispersion by mixing a first dispersion comprising fine palladium-containing particles being dispersed in an acid solution with a copper-containing solution, and applying a potential that is nobler than the oxidation reduction potential of copper to the fine palladium-containing particles in the second dispersion, and a platinum covering step of covering at least part of the fine palladium-containing particle with platinum by substituting the copper covering at least part of the fine palladium-containing particle with platinum by mixing the second dispersion and a platinum-containing solution after the copper covering step, with applying a constant potential that is in a range between a potential that is nobler than the oxidation reduction potential of copper and a potential that is less than the oxidation reduction potential of platinum, to the fine palladium-containing particles. 2. The method for producing the fine catalyst particles according to claim 1 , wherein, the second dispersion and the platinum-containing solution are mixed in the platinum covering step, with applying a constant potential that is in a range of from 0.37 to 0.70 V (vs. RHE) to the fine palladium-containing particles. 3. A method for producing a carbon-supported catalyst in which the fine catalyst particles produced by the method of claim 1 are supported on a carbon support, wherein fine palladium-containing particles configured for use in the copper covering step are supported on a carbon support.
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Classifications
Processes of manufacture · CPC title
of particles · CPC title
Mixing {(B01J37/0009, B01J37/0018 take precedence)} · CPC title
Metals of platinum group (H01M4/94 {, H01M4/9058} take precedence) · CPC title
on carbon or graphite · CPC title
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Frequently asked questions
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- What does patent US9950314B2 cover?
- The present invention is to provide fine catalyst particles to which sulfate ions are less likely to be adsorbed, and a carbon-supported catalyst to which sulfate ions are less likely to be adsorbed. Disclosed is a method for producing fine catalyst particles comprising a fine palladium-containing particle and a platinum-containing outermost layer covering at least part of the fine palladium-co…
- Who is the assignee on this patent?
- Toyota Motor Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification B01J23/44. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Apr 24 2018 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).