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-2017051419-A1
Application number	US-201615241798-A
Country	US
Kind code	A1
Filing date	Aug 19, 2016
Priority date	Aug 21, 2015
Publication date	Feb 23, 2017
Grant date	—

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 a nickel electrodeposited on the carbonaceous material, wherein the nickel is partially substituted with a platinum and the substitution with the platinum provides an increased hydrogen evolution activity as compared to the same electrocatalyst before substitution with the platinum.

2 . The electrocatalyst according to claim 1 , wherein a surface of the nickel is coated with the platinum.

3 . The electrocatalyst according to claim 2 , wherein the nickel is nickel particles having a particle shape and the surface of nickel particles is partially or totally coated with platinum.

4 . The electrocatalyst according to claim 1 , wherein the platinum is included in a loading amount of 1.0-2.3 μg/cm 2 .

5 . The electrocatalyst according to claim 1 , wherein the platinum is distributed on the surface of nickel in the form of spherical dots.

6 . The electrocatalyst according to claim 5 , wherein the platinum is distributed on the surface of nickel at a distribution ratio of 10-30%.

7 . The electrocatalyst according to claim 3 , wherein the platinum particles are present on the surface of the nickel particles and have an average particle diameter of 50-200 nm.

8 . The electrocatalyst according to claim 1 , wherein the nickel is included in a loading amount of 2.55-4.0 μg/cm 2 .

9 . The electrocatalyst according to claim 7 , wherein the nickel particles have an average particle diameter of 400-900 nm.

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

11 . The electrocatalyst according to claim 1 , which has a thickness of 300-600 nm.

12 . The electrocatalyst according to claim 1 , which is a catalyst for a hydrogen-evolving electrode.

13 . The electrocatalyst according to claim 2 , wherein the surface of the nickel has a platinum-substituted portion coexisting with a non-substituted portion, and the non-substituted portion facilitates formation of reaction intermediates on the platinum.

14 . The electrocatalyst according to claim 1 , which is a particle-type electrocatalyst.

15 . The electrocatalyst according to claim 14 , wherein platinum particles are distributed on the surface of the nickel particles.

16 . 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 .

17 . An anion exchange membrane electrolyzer comprising the membrane electrode assembly as defined in claim 16 .

18 . The anion exchange membrane electrolyzer according to claim 17 , which is operated 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

• C25B9/10

  Chemistry & Metallurgy · mapped topic

• C25B11/0415

  Chemistry & Metallurgy · mapped topic

• C25D3/50

  of platinum group metals · CPC title

• C25D3/12

  of nickel or cobalt · CPC title

• C25B11/0405

  Chemistry & Metallurgy · mapped topic