Ultral-low loading of Pt-decorated Ni electrocatalyst, manufacturing method of the same and anion exchange membrane water electrolyzer using the same

Patent metadata

Field	Value
Publication number	US-10669640-B2
Application number	US-201615241798-A
Country	US
Kind code	B2
Filing date	Aug 19, 2016
Priority date	Aug 21, 2015
Publication date	Jun 2, 2020
Grant date	Jun 2, 2020

Abstract

Provided is an electrocatalyst for anion exchange membrane water electrolysis, including a carbonaceous material, and nickel electrodeposited on the carbonaceous material, wherein nickel is partially substituted with platinum and the substitution with platinum provides increased hydrogen evolution activity as compared to the same electrocatalyst before substitution with platinum. Also provided are a method for preparing the electrocatalyst and an anion exchange membrane water electrolyzer using the same. The nickel electrocatalyst coated with an ultralow loading amount of platinum for anion exchange membrane water electrolysis shows excellent hydrogen evolution activity and has a small thickness of catalyst, thereby providing high mass transfer and high catalyst availability. In addition, the electrocatalyst uses a particle-type electrode to facilitate emission of hydrogen bubbles generated during hydrogen evolution reaction and oxygen bubbles generated during oxygen evolution reaction, and requires low cost for preparation to provide high cost-efficiency.

First claim

What is claimed is:

1. An electrocatalyst for an anion exchange membrane water electrolysis, comprising:
a carbonaceous material; and
nickel particles electrodeposited on the carbonaceous material,
wherein a surface of one or more of the nickel particles is partially surrounded with one or more platinum particle,
wherein a ratio of a loading weight of the one or more platinum particle to a loading weight of the nickel particles is 0.25 to 0.91,
wherein the surface of the one or more of the nickel particles surrounded with the one or more platinum particle comprises a platinum-substituted portion coexisting with a non-substituted portion,
wherein the one or more platinum particle is included in the loading weight of 1.0-2.3 μg/cm 2 ,
wherein the one or more platinum particle has an average particle diameter of 50-200 nm, and
wherein the nickel particles have an average particle diameter of 400-900 nm.

2. The electrocatalyst according to claim 1 , wherein the one or more platinum particle is distributed on the surface of the one or more of the nickel particles as spherical dots.

3. The electrocatalyst according to claim 2 , wherein the one or more platinum particle is distributed on the surface of the one or more of nickel particles at a distribution ratio of 10-30%.

4. The electrocatalyst according to claim 1 , wherein the nickel particles are included in the loading weight of 2.55-4.0 μg/cm 2 .

5. The electrocatalyst according to claim 1 , wherein the carbonaceous material is a carbon paper comprising carbon fibers.

6. The electrocatalyst according to claim 1 , wherein a thickness of the electrocatalyst is in a range of 300-600 nm.

7. The electrocatalyst according to claim 1 , wherein the electrocatalyst is a catalyst for a hydrogen-evolving electrode.

8. The electrocatalyst according to claim 1 , wherein the non-substituted portion facilitates formation of reaction intermediates on the one or more platinum particle.

9. The electrocatalyst according to claim 1 , wherein the electrocatalyst is a particle-type electrocatalyst.

10. The electrocatalyst according to claim 9 , wherein the one or more platinum particle is platinum particles distributed on the surface of the one or more of the nickel particles.

11. A membrane electrode assembly for an anion exchange membrane water electrolyzer, comprising:
an anion exchange membrane; and
an electrode on the anion exchange membrane,
wherein the electrode comprises the electrocatalyst as defined in claim 1 .

12. An anion exchange membrane electrolyzer comprising the membrane electrode assembly as defined in claim 11 .

13. The anion exchange membrane electrolyzer according to claim 12 , wherein the anion exchange membrane electrolyzer is operable at 40-80° C.

Assignees

• Korea Inst Sci & Tech

Inventors

• Jang Jong Hyun
• Kim Soo-Kil
• Ahn Sang Hyun
• Kim Hyoung-Juhn
• Kim Jin Young
• Yoo Sung Jong
• Henkensmeier Dirk
• Han Jonghee
• Ryu Jaeyune

Classifications

• C25D5/54 Primary

  Electroplating of non-metallic surfaces (C25D7/12 takes precedence) · CPC title

• C23C18/54

  Contact plating, i.e. electroless electrochemical plating · CPC title

• C25B11/0478 Primary

  Chemistry & Metallurgy · mapped topic

• C25B1/10

  Chemistry & Metallurgy · mapped topic

• C25B9/10

  Chemistry & Metallurgy · mapped topic