Core-shell FE2P@c-FE3C electrocatalyst and preparation method and application thereof

Patent metadata

Field	Value
Publication number	US-11732370-B2
Application number	US-202117381089-A
Country	US
Kind code	B2
Filing date	Jul 20, 2021
Priority date	Jul 23, 2020
Publication date	Aug 22, 2023
Grant date	Aug 22, 2023

Abstract

The present invention relates to a core-shell Fe2P@C—Fe3C electrocatalyst and a preparation method and application thereof. The core-shell Fe2P@C—Fe3C electrocatalyst comprises a carbon nanotube as a matrix which is formed by a carbon layer with FeC3 nano-dots distributed therein, and Fe2P@C embedded in the carbon nanotube. The Fe2P@C has a core-shell structure and is formed by coating Fe2P with carbon.

First claim

The invention claimed is:

1. A core-shell Fe 2 P@C—Fe 3 C electrocatalyst, comprising:
a carbon nanotube as a matrix which is formed by a carbon layer with FeC 3 nanodots distributed therein; and
Fe 2 P@C embedded in the carbon nanotube,
wherein the Fe 2 P@C has a core-shell structure and is formed by coating Fe 2 P with a C layer.

2. The core-shell Fe 2 P@C—Fe 3 C electrocatalyst of claim 1 , wherein in the Fe 2 P@C, a thickness of the C layer is 2.5 to 3.5 nm, and a particle size of the Fe 2 P is 12 to 15 nm.

3. The core-shell Fe 2 P@C—Fe 3 C electrocatalyst of claim 1 , wherein a diameter of the carbon nanotube is 30 to 40 nm, and a wall thickness of the carbon nanotube is 4 to 6 nm.

4. The core-shell Fe 2 P@C—Fe 3 C electrocatalyst of claim 1 , wherein a particle size of the FeC 3 nanodots is 4 to 6 nm.

5. The core-shell Fe 2 P@C—Fe 3 C electrocatalyst of claim 1 , wherein the content of P in the core-shell Fe 2 P@C—Fe 3 C electrocatalyst is 2.07 at %.

6. A preparation method of the core-shell Fe 2 P@C—Fe 3 C electrocatalyst of claim 1 , comprising:
(1) dissolving FeCl 3 .6H 2 O, C 2 H 4 N 4 , and F127 in a solvent to form a mixed solution, and then removing the solvent by drying, to obtain a powder;
(2) putting the powder and sodium hypophosphite separately in different places of a porcelain boat, and under a protective atmosphere, first heating them at 300 to 500° C. for 1 to 3 hours, and then heating them at 700 to 900° C. for 1 to 3 hours, to obtain the core-shell Fe 2 P@C—Fe 3 C electrocatalyst.

7. The preparation method of claim 6 ,
wherein in the mixed solution, a mass concentration of FeCl 3 .6H 2 O is 0.005 to 0.03 g/mL, a mass concentration of C 2 H 4 N 4 is 0.04 to 0.12 g/mL, and a mass concentration of F127 is 0.002 to 0.008 g/mL, and
wherein a mass ratio of FeCl 3 .6H 2 O, C 2 H 4 N 4 , and F127 is (0.5 to 1.5):(4 to 6):(0.2 to 0.4).

8. The preparation method of claim 6 , wherein a mass ratio of the powder and the sodium hypophosphite is (5 to 7):(4 to 6).

9. The preparation method of claim 6 , wherein the protective atmosphere is a mixed atmosphere of hydrogen and argon.

10. A use of the core-shell Fe 2 P@C—Fe 3 C electrocatalyst of claim 1 in a hydrogen evolution reaction, an oxygen evolution reaction, or an oxygen reduction reaction.

Assignees

• Shaanxi Univ Of Science & Technology

Inventors

• Huang Jianfeng
• Zhang Xiao
• Feng Liangliang
• Cao Liyun
• Liu Qianqian
• Li Shuainan
• He Danyang

Classifications

• B01J35/40

  characterised by dimensions, e.g. grain size (in a colloidal state B01J35/23; crystallite size B01J35/77) · CPC title

• B01J35/33

  Electric or magnetic properties · CPC title

• B01J35/61

  Surface area · CPC title

• C25B11/091 Primary

  consisting of at least one catalytic element and at least one catalytic compound; consisting of two or more catalytic elements or catalytic compounds · CPC title

• C25B1/02

  Hydrogen or oxygen · CPC title