Nanoframes with three-dimensional electrocatalytic surfaces
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.
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.