Electrocatalyst for water electrolysis and preparing method of the same

Patent metadata

Field	Value
Publication number	US-2022259748-A1
Application number	US-202217588597-A
Country	US
Kind code	A1
Filing date	Jan 31, 2022
Priority date	Feb 2, 2021
Publication date	Aug 18, 2022
Grant date	—

Abstract

The present application relates to an electrode catalyst for water electrolysis including a first transition metal foam, a metal layered double hydroxide (LDH)/metal oxide mixed layer which contains a second transition metal and a third transition metal that are formed on the surface of the first transition metal foam, and fourth transition metal oxyhydroxide nanoparticles formed on the surface of the mixed layer, in which the mixed layer surface contains the metal layered double hydroxide.

First claim

1 . An electrode catalyst for water electrolysis comprising:
a first transition metal foam; a metal layered double hydroxide (LDH)/metal oxide mixed layer which contains a second transition metal and a third transition metal that are formed on the surface of the first transition metal foam; and fourth transition metal oxyhydroxide nanoparticles formed on the surface of the mixed layer, wherein the mixed layer surface contains the metal layered double hydroxide.

2 . The electrode catalyst for water electrolysis of claim 1 , further comprising a chloride ion blocking layer formed on the surface of the catalyst.

3 . The electrode catalyst for water electrolysis of claim 2 , wherein the nanoparticles have a diameter of 1 nm to 6 nm.

4 . The electrode catalyst for water electrolysis of claim 2 , wherein the blocking layer contains a material selected from the group consisting of graphene, graphene oxide, reduced graphene oxide, and combinations thereof.

5 . The electrode catalyst for water electrolysis of claim 4 , wherein the blocking layer has an interlayer spacing of 0.1 nm to 1 nm.

6 . The electrode catalyst for water electrolysis of claim 1 , wherein the metal layered double hydroxide is one which is in a beta-phase (β-phase).

7 . The electrode catalyst for water electrolysis of claim 1 , wherein the metal layered double hydroxide and the nanoparticles have interfacial oxygen bridges formed on the interface therebetween.

8 . The electrode catalyst for water electrolysis of claim 1 , wherein the first transition metal to the fourth transition metal each independently include one selected from the group consisting of Ni, Co, Fe, Cu, W, Mo, Sc, Ti, V, Cr, Mn, Zn, Y, Zr, Nb, Tc, Ru, Rh, Pd, Ag, Cd, Hf, Ta, Re, Os, Ir, Pt, Au, Hg, Rf, Db, Sg, Bh, Hs, Mt, Ds, Rg, Cn, and combinations thereof.

9 . The electrode catalyst for water electrolysis of claim 1 , wherein the catalyst includes a three-dimensional porous structure.

10 . The electrode catalyst for water electrolysis of claim 1 , wherein the catalyst is one which is used as an electrode catalyst for oxygen evolution reaction (OER) or hydrogen evolution reaction (HER) in alkaline seawater.

11 . A method for preparing an electrode catalyst for water electrolysis, the method comprising:
a first step of forming a metal layered double hydroxide (LDH) including the second transition metal and the third transition metal on the surface of the first transition metal foam by immersing a first transition metal foam in a solution containing a second transition metal and a third transition metal; a second step of forming a metal layered double hydroxide/metal oxide mixed layer by annealing the metal layered double hydroxide; and a third step of forming fourth transition metal oxyhydroxide nanoparticles on the surface of the mixed layer by immersing the mixed layer in a solution containing a fourth transition metal oxyhydroxide precursor.

12 . The method of claim 11 , wherein the third step further comprises a step of forming a chloride ion blocking layer.

13 . The method of claim 12 , wherein the step of forming the blocking layer comprises a step of immersing the nanoparticles in a solution containing a material selected from the group consisting of graphene, graphene oxide, reduced graphene oxide, and combinations thereof.

14 . The method of claim 11 , wherein the metal layered double hydroxide is grown in a petal-like shape from the surface of the first transition metal foam.

15 . The method of claim 11 , wherein the metal layered double hydroxide is converted into a metal oxide layer by annealing it in a temperature range of 100° C. to 400° C.

16 . The method of claim 11 , wherein the annealing step is performed for 30 minutes to 4 hours.

17 . The method of claim 11 , wherein the third step is performed by one selected from the group consisting of an electrodeposition method, a coevaporation method, a sputtering method, an RF sputtering method, a DC sputtering method, a reactive sputtering method, an ion beam sputtering method, an evaporation deposition method, a chemical vapor deposition (CVD) method, a low pressure chemical vapor deposition (LPCVD) method, a plasma-enhanced chemical vapor deposition (PECVD) method, an ion plating method, an E-beam evaporation method, a metal organic chemical vapor deposition (MOCVD) method, a molecular beam epitaxy (MBE) method, a screen printing method, a particle deposition method, an atomic layer epitaxy method, and combinations thereof.

18 . A seawater decomposition system including the electrode catalyst for water electrolysis according to claim 1 .

Assignees

• Research & Business Found Sungkyunkwan Univ
• Inst Basic Science

Inventors

• Lee Hyoyoung
• Amol Jadhav

Classifications

• C25B11/053 Primary

  characterised by multilayer electrocatalytic coatings · CPC title

• Y02E60/36

  Hydrogen production from non-carbon containing sources, e.g. by water electrolysis · CPC title

• Y02E60/50

  Fuel cells · CPC title

• C25B11/091

  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

• C25B11/061

  Metal or alloy · CPC title