Ultrafine nanowires as highly efficient electrocatalysts

Patent metadata

Field	Value
Publication number	US-2019226120-A1
Application number	US-201716329084-A
Country	US
Kind code	A1
Filing date	Aug 29, 2017
Priority date	Aug 30, 2016
Publication date	Jul 25, 2019
Grant date	—

Abstract

A manufacturing method includes: (1) providing M-M′ nanowires, wherein M′ is at least one sacrificial metal different from M; and (2) subjecting the M-M′ nanowires to electrochemical de-alloying to form jagged M nanowires.

First claim

What is claimed is:

1 . A manufacturing method comprising:
providing M-M′ nanowires, wherein M′ is at least one sacrificial metal different from M; and subjecting the M-M′ nanowires to electrochemical de-alloying to form jagged M nanowires.

2 . The manufacturing method of claim 1 , wherein M is at least one noble metal selected from Pt, Ru, Pd, Ag, Rh, Os, Ir, and Au.

3 . The manufacturing method of claim 1 , wherein M includes two different metals M 1 and M 2 .

4 . The manufacturing method of claim 1 , wherein M′ is selected from Ni, Ti, V, Fe, Co, Cu, Ru, Pd, Ag, Mo, and W.

5 . The manufacturing method of claim 1 , wherein M′ is Ni.

6 . The manufacturing method of claim 1 , wherein M′ includes two different sacrificial metals M′ l and M′ 2 .

7 . The manufacturing method of claim 1 , wherein the M-M′ nanowires include an alloy of M and M′.

8 . The manufacturing method of claim 1 , wherein providing the M-M′ nanowires includes:
forming core/shell nanowires each including a core including M and a shell including an oxide of M′; and
subjecting the core/shell nanowires to thermal annealing to form the M-M′ nanowires.

9 . The manufacturing method of claim 1 , wherein subjecting the M-M′ nanowires to electrochemical de-alloying includes subjecting the M-M′ nanowires to cyclic voltammetry in the presence of an acidic solution as an electrolyte to selectively remove M′ from the M-M′ nanowires.

10 . A catalyst material comprising:
a catalyst support; and jagged Pt nanowires affixed to the catalyst support.

11 . The catalyst material of claim 10 , wherein the jagged Pt nanowires have an average diameter in a range of up to 5 nm.

12 . The catalyst material of claim 10 , wherein the jagged Pt nanowires have an electrochemical active surface area of at least 80 m 2 /g Pt .

13 . The catalyst material of claim 10 , wherein the jagged Pt nanowires have a mass activity for oxygen reduction reaction at 0.9 V vs. RHE of at least 8 A/mg Pt .

14 . A method comprising:
(1) catalyzing oxygen reduction reaction or hydrogen evolution reaction using the catalyst material of claim 10 ; (2) catalyzing oxygen evolution reaction using the catalyst material of claim 10 ; (3) catalyzing CO 2 reduction using the catalyst material of claim 10 ; (4) catalyzing CO oxidation using the catalyst material of claim 10 ; (5) catalyzing N 2 reduction using the catalyst material of claim 10 ; (6) catalyzing methanol oxidation reaction using the catalyst material of claim 10 ; or (7) catalyzing ethanol oxidation reaction using the catalyst material of claim 10 .

15 . A manufacturing method comprising:
providing M-M′ nanostructures, wherein M′ is at least one sacrificial metal different from M; and subjecting the M-M′ nanostructures to electrochemical de-alloying to form M nanostructures.

16 . The manufacturing method of claim 15 , wherein the M-M′ nanostructures are M-M′ nanoparticles, and the M nanostructures are M nanoparticles.

17 . The manufacturing method of claim 15 , wherein M is at least one noble metal.

18 . The manufacturing method of claim 15 , wherein M′ is selected from Ni, Ti, V, Fe, Co, Cu, Ru, Pd, Ag, Mo, and W.

19 . The manufacturing method of claim 15 , wherein the M-M′ nanostructures include an alloy of M and M′.

20 . The manufacturing method of claim 15 , wherein providing the M-M′ nanostructures includes:
forming core/shell nanostructures each including a core including M and a shell including an oxide of M′; and
subjecting the core/shell nanostructures to thermal annealing to form the M-M′ nanostructures.

21 . The manufacturing method of claim 15 , wherein subjecting the M-M′ nanostructures to electrochemical de-alloying includes subjecting the M-M′ nanostructures to cyclic voltammetry in the presence of an acidic solution as an electrolyte to selectively remove M′ from the M-M′ nanostructures.

Assignees

• Univ California

Inventors

• Duan Xiangfeng
• Huang Yu
• Li Mufan

Classifications

• B22F1/054

  Nanosized particles · CPC title

• B22F1/16

  Metallic particles coated with a non-metal (coated with lubricating or binding agents or with organic material B22F1/10) · CPC title

• B22F1/025

  Operations & Transport · mapped topic

• C30B7/14

  the crystallising materials being formed by chemical reactions in the solution · CPC title

• H01M4/926

  on carbon or graphite · CPC title