Nanoframes with three-dimensional electrocatalytic surfaces

Patent metadata

Field	Value
Publication number	US-10686195-B2
Application number	US-201514625443-A
Country	US
Kind code	B2
Filing date	Feb 18, 2015
Priority date	Feb 19, 2014
Publication date	Jun 16, 2020
Grant date	Jun 16, 2020

Abstract

Described herein are bimetallic nanoframes and methods for producing bimetallic nanoframes. A method may include providing a solution including a plurality of nanoparticles dispersed in a solvent, and exposing the solution to oxygen to convert the plurality of nanoparticles into a plurality of nanoframes.

First claim

What is claimed is:

1. A composition of matter, comprising:
a bimetallic nanoframe having a polyhedral shape with a hollow interior and having a ratio of electrochemically-active surface area to volume that is greater than 2 nm −1 .

2. The composition of matter of claim 1 , wherein the bimetallic nanoframe comprises a composition of a form of X n Y m , wherein X is a metal selected from a first group consisting of Pt, Pd, Rh, and Au, and wherein Y is a metal selected from a second group consisting of Ni, Cu, and Co.

3. The composition of matter of claim 1 , wherein the composition comprises Pt 3 Ni.

4. The composition of matter of claim 1 , wherein the composition comprises Pt at a concentration of greater than 60% by weight of the bimetallic nanoframe.

5. The composition of matter of claim 4 , wherein the electrochemically-active surface area is formed by a portion of the Pt present as a skin structure.

6. The composition of matter of claim 1 , wherein the bimetallic nanoframe was formed according to a process comprising reacting a precursor particle with oxygen, wherein the reacting effects formation of the bimetallic nanoframe.

7. A composition of matter, comprising:
a bimetallic open frame nanoframe having a polyhedral shape defined by a plurality of interconnected struts forming edges of the polyhedral shape and further defining at least four facets of the polyhedral shape exposing a hollow interior, the bimetallic nanoframe further having a ratio of electrochemically-active surface area to volume that is greater than 2 nm −1 , wherein the nanoframe comprises a plurality of interconnected struts arranged to form the edges of a polyhedron, defining a hollow interior volume, wherein each of the plurality of interconnected struts has a diameter less than 10 nanometers (nm) and a length of 50 nm.

8. The composition of matter of claim 7 , wherein the diameter of each of the plurality of interconnected struts is 2 nm.

9. The composition of matter of claim 7 , wherein each of the plurality of struts has an electrochemically-active surface area formed by a portion of Pt present as a skin structure.

Assignees

• Univ California
• Uchicago Argonne Llc

Inventors

• Yang Peidong
• Stamenkovic Vojislav
• Somorjai Gabor A
• Markovic Nenad
• Chen Chen
• Kang Yijin
• Becknell Nigel H

Classifications

• Y02E60/50

  Fuel cells · CPC title

• B82B3/0033

  Manufacture or treatment of substrate-free structures, i.e. not connected to any support · CPC title

• H01M4/8657

  layered · CPC title

• C22C5/04

  Alloys based on a platinum group metal · CPC title

• H01M4/8889

  Cosintering or cofiring of a catalytic active layer with another type of layer · CPC title