ULTRATHIN, TERNARY ALLOY PtRuFe NANOWIRES, AND METHODS OF MAKING SAME

Patent metadata

Field	Value
Publication number	US-2016293969-A1
Application number	US-201615092530-A
Country	US
Kind code	A1
Filing date	Apr 6, 2016
Priority date	Apr 6, 2015
Publication date	Oct 6, 2016
Grant date	—

Abstract

The present invention provides a method of producing ternary metal-based nanowire networks. The method comprises combining an aqueous mixture of a platinum hydrate, a ruthenium hydrate, and an iron hydrate with a solution of hexadecyltrimethylammonium bromide in chloroform to form an inverse micellar network; adding a reducing agent to reduce metal ions within the inverse micellar network; and isolating the nanowires. The relative amounts of the platinum, ruthenium and iron in the mixture correlate to the atomic ratio of the platinum, ruthenium and iron in the ternary nanowires. The diameters of the ternary nanowires are from about 0.5 nm to about 5 nm.

First claim

1 . A method of producing ternary metal-based nanowire networks, the method comprising:
combining an aqueous mixture of a platinum hydrate, a ruthenium hydrate, and an iron hydrate with a solution of hexadecyltrimethylammonium bromide in chloroform to form an inverse micellar network; adding a reducing agent to reduce metal ions within the inverse micellar network; and isolating the nanowires,
wherein the relative amount of the platinum, ruthenium and iron in the mixture correlate to the atomic ratio of the platinum, ruthenium and iron in the ternary nanowires, wherein the diameters of the ternary nanowires are from about 0.5 nm to about 5 nm.

2 . The method of claim 1 , wherein the formula of the nanowires is Pt 7 Ru 2 Fe, Pt 7 Ru 1.5 Fe 1.5 , Pt 7 RuFe 2 , or Pt 7 Ru 0.5 Fe 2.5 .

3 . The method of claim 1 wherein the platinum hydrate is hexachloroplatinic acid hydrate (H 2 PtCl 6 .6H 2 O).

4 . The method of claim 1 wherein the ruthenium hydrate is ruthenium(III) chloride hydrate (RuCl 3 .xH 2 O).

5 . The method of claim 1 wherein the iron hydrate is iron(III) nitrate nonahydrate (Fe(NO 3 ) 3 .9H 2 O).

6 . The method of claim 1 wherein the reducing agent is sodium borohydride (NaBH 4 ).

7 . The method according to claim 1 wherein the diameters of the ternary nanowires are less than about 2 nm.

8 . A ternary metal-based nanowire having a diameter of about 0.5 nm to about 5 nm and having formula Pt 7 Ru 2 Fe, Pt 7 Ru 1.5 Fe 1.5 , Pt 7 RuFe 2 , or Pt 7 Ru 0.5 Fe 2.5 .

9 . The ternary metal-based nanowire of claim 8 having a diameter of about 2 nm.

10 . The ternary metal-based nanowire of claim 8 , wherein the nanowire is segmented and comprises single crystalline segments.

11 . The ternary metal-based nanowire of claim 8 , wherein the specific activity of the nanowire is at least about ten times as great as the specific activity of a binary platinum-iron or platinum-ruthenium nanowire.

Assignees

• Univ New York State Res Found

Inventors

• Wong Stanislaus
• Koenigsmann Christopher
• Scofield Megan

Classifications

• H01M8/1011

  Direct alcohol fuel cells [DAFC], e.g. direct methanol fuel cells [DMFC] · CPC title

• H01M4/921 Primary

  Alloys or mixtures with metallic elements · CPC title

• B82Y40/00

  Manufacture or treatment of nanostructures · CPC title

• H01M4/928

  Unsupported catalytic particles; loose particulate catalytic materials, e.g. in fluidised state · CPC title

• B82Y30/00

  Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title