Gas Diffusion Electrodes and Methods for Fabricating and Testing Same
US-2015376803-A1 · Dec 31, 2015 · US
Method for producing fuel cell electrode catalyst
US9947940B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9947940-B2 |
| Application number | US-201415103383-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 26, 2014 |
| Priority date | Dec 27, 2013 |
| Publication date | Apr 17, 2018 |
| Grant date | Apr 17, 2018 |
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Abstract
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A method is provided for producing a platinum alloy-containing fuel cell electrode catalyst with high activity which is suited for its industrial mass-production. The method for producing a fuel cell electrode catalyst includes a step of preparing a dispersion in which particles of a fuel cell electrode catalyst precursor including a platinum alloy is dispersed in an electrolyte solution, and a step of alternately subjecting the dispersion to bubbling with an oxidizing gas and to bubbling with an inert gas or a reducing gas.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method for producing a fuel cell electrode catalyst comprising: a step of preparing a dispersion in which a fuel cell electrode catalyst precursor comprising a platinum alloy is dispersed in an electrolyte solution, and a step of alternately subjecting the dispersion to bubbling with an oxidizing gas and to bubbling with an inert gas or a reducing gas. 2. The method for producing a fuel cell electrode catalyst described in claim 1 , wherein the electrolyte solution is an aqueous sulfuric acid solution, an aqueous perchloric acid solution, hydrochloric acid or an aqueous nitric acid solution. 3. The method for producing a fuel cell electrode catalyst described in claim 1 , wherein the oxidizing gas is an oxygen gas. 4. The method for producing a fuel cell electrode catalyst described in claim 1 , wherein the inert gas or the reducing gas is an inert gas. 5. The method for producing a fuel cell electrode catalyst described in claim 4 , wherein the inert gas is nitrogen gas. 6. The method for producing a fuel cell electrode catalyst described in claim 1 , wherein the step of alternately subjecting the dispersion to bubbling with an oxidizing gas comprises subjecting the dispersion to bubbling with an oxidizing gas for at least 5 minutes so as to oxidize surfaces of the platinum alloy and to bubbling with an inert gas or a reducing gas for at least 5 minutes so as to reduce oxidized surfaces of the platinum alloy. 7. The method for producing a fuel cell electrode catalyst described in claim 1 , wherein the platinum alloy contains platinum and one or more other metal elements in a molar ratio of platinum:other metal element(s)=1:0.1 to 10. 8. The method for producing a fuel cell electrode catalyst described in claim 1 , wherein bubbling with the oxidizing gas is carried out until a difference in potential of the electrode catalyst precursor after bubbling is not less than 0.03 V. 9. The method for producing a fuel cell electrode catalyst described in claim 1 , wherein bubbling with an inert gas or a reducing gas is carried out until a difference in potential of the electrode catalyst precursor after bubbling is not more than −0.03 V.
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Classifications
Unsupported catalytic particles; loose particulate catalytic materials, e.g. in fluidised state · CPC title
- H01M4/921Primary
Alloys or mixtures with metallic elements · CPC title
Processes of manufacture · CPC title
supported on carriers, e.g. powder carriers · CPC title
on carbon or graphite · CPC title
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Frequently asked questions
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- What does patent US9947940B2 cover?
- A method is provided for producing a platinum alloy-containing fuel cell electrode catalyst with high activity which is suited for its industrial mass-production. The method for producing a fuel cell electrode catalyst includes a step of preparing a dispersion in which particles of a fuel cell electrode catalyst precursor including a platinum alloy is dispersed in an electrolyte solution, and a…
- Who is the assignee on this patent?
- Showa Denko Kk
- What technology area does this patent fall under?
- Primary CPC classification H01M4/921. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Apr 17 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 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).