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
US2017028385A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2017028385-A1 |
| Application number | US-201515303877-A |
| Country | US |
| Kind code | A1 |
| Filing date | Apr 3, 2015 |
| Priority date | Apr 18, 2014 |
| Publication date | Feb 2, 2017 |
| Grant date | — |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
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).
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 defined by 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.
Assignees
Inventors
Classifications
Scanning electron microscopy; Transmission electron microscopy · CPC title
Indexing scheme associated with group B01J35/00, related to the analysis techniques used to determine the catalysts form or properties · CPC title
with a non-spherical or unspecified core-shell structure · CPC title
Carbon · CPC title
Impregnation, coating or precipitation ({B01J37/0009 and B01J37/0018 take precedence } ; protection by coating B01J33/00) · CPC title
Patent family
Related publications grouped by family.
External sources
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US2017028385A1 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 Thu Feb 02 2017 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). 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).