Gas Diffusion Electrodes and Methods for Fabricating and Testing Same
US-2015376803-A1 · Dec 31, 2015 · US
Platinum-coated non-noble metal-noble metal core-shell electrocatalysts
US9005331B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9005331-B2 |
| Application number | US-70822610-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 18, 2010 |
| Priority date | Dec 22, 2004 |
| Publication date | Apr 14, 2015 |
| Grant date | Apr 14, 2015 |
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Abstract
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Core-shell particles encapsulated by a thin film of a catalytically active metal are described. The particles are preferably nanoparticles comprising a non-noble core with a noble metal shell which preferably do not include Pt. The non-noble metal-noble metal core-shell nanoparticles are encapsulated by a catalytically active metal which is preferably Pt. The core-shell nanoparticles are preferably formed by prolonged elevated-temperature annealing of nanoparticle alloys in an inert environment. This causes the noble metal component to surface segregate and form an atomically thin shell. The Pt overlayer is formed by a process involving the underpotential deposition of a monolayer of a non-noble metal followed by immersion in a solution comprising a Pt salt. A thin Pt layer forms via the galvanic displacement of non-noble surface atoms by more noble Pt atoms in the salt. The overall process is a robust and cost-efficient method for forming Pt-coated non-noble metal-noble metal core-shell nanoparticles.
First claim
Opening claim text (preview).
The invention claimed is: 1. An electrocatalyst comprising: a core at least partially encapsulated by a shell to form a core-shell particle in which the core and shell have different compositions wherein the core and shell do not include Pt; and a layer of platinum atoms at least partially encapsulating the core-shell particle, wherein the layer of platinum atoms is one to three monolayers thick, and wherein the electrocatalyst promotes electrochemical reactions.…
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Operations & Transport · mapped topic
Operations & Transport · mapped topic
- H01M4/921Primary
Electricity · mapped topic
Electricity · mapped topic
Electricity · mapped topic
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- What does patent US9005331B2 cover?
- Core-shell particles encapsulated by a thin film of a catalytically active metal are described. The particles are preferably nanoparticles comprising a non-noble core with a noble metal shell which preferably do not include Pt. The non-noble metal-noble metal core-shell nanoparticles are encapsulated by a catalytically active metal which is preferably Pt. The core-shell nanoparticles are prefer…
- Who is the assignee on this patent?
- Adzic Radoslav, Zhang Junliang, Mo Yibo, and 2 more
- 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 14 2015 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).