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
US2017117554A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2017117554-A1 |
| Application number | US-201515302006-A |
| Country | US |
| Kind code | A1 |
| Filing date | Feb 13, 2015 |
| Priority date | Apr 11, 2014 |
| Publication date | Apr 27, 2017 |
| Grant date | — |
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Abstract
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The present invention is to provide fine catalyst particles with better catalytic performance than ever before and a carbon-supported catalyst with better catalytic performance than ever before. Disclosed is a method for producing fine catalyst particles, comprising: a potential applying step of applying a potential to the fine palladium-containing particles in a first dispersion, until a peak indicating a Pd{111} surface in a reduction wave of a cyclic voltammogram becomes larger than a peak indicating a Pd{110} or Pd{100} surface in the reduction wave of the cyclic voltammogram; a copper covering step of covering at least part of the fine palladium-containing particle with copper by preparing a second dispersion by mixing the first dispersion and a copper-containing solution after the potential applying step, 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 mixing the second dispersion and a platinum-containing solution after the copper covering step.
First claim
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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 potential applying step of applying a potential to the fine palladium-containing particles in a first dispersion comprising fine palladium-containing particles being dispersed in an acid solution and having an average particle diameter of 3.0 nm or more and 6.0 nm or less, until a peak indicating a Pd{111} surface in a reduction wave of a cyclic voltammogram becomes larger than a peak indicating a Pd{110} or Pd{100} surface in the reduction wave of the cyclic voltammogram; a copper covering step of covering at least part of the fine palladium-containing particle with copper by preparing a second dispersion by mixing the first dispersion and a copper-containing solution after the potential applying step, 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. 2 . The method for producing the fine catalyst particles according to claim 1 , wherein the potential is swept in a range including at least 1.2 V (vs. RHE) in the potential applying step. 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 potential applying step are supported on a carbon support.
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Classifications
Compounds thereof with non-metallic elements · CPC title
- H01M4/8657Primary
layered · CPC title
on carbon or graphite · CPC title
Electrodeposition · CPC title
Fuel cells · CPC title
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- What does patent US2017117554A1 cover?
- The present invention is to provide fine catalyst particles with better catalytic performance than ever before and a carbon-supported catalyst with better catalytic performance than ever before. Disclosed is a method for producing fine catalyst particles, comprising: a potential applying step of applying a potential to the fine palladium-containing particles in a first dispersion, until a peak …
- Who is the assignee on this patent?
- Toyota Motor Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification H01M4/8657. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Thu Apr 27 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).