Composite for porous transport layer, sintered body thereof, and method for preparing the same

Patent metadata

Field	Value
Publication number	US-2022339702-A1
Application number	US-202117375344-A
Country	US
Kind code	A1
Filing date	Jul 14, 2021
Priority date	Apr 23, 2021
Publication date	Oct 27, 2022
Grant date	—

Abstract

A composite for a porous transport layer may include a particulate substrate including at least one selected from a group consisting of an oxide of a first metal and a second metal, and nanoparticles of a third metal formed on a surface of the particulate substrate, a sintered body thereof, and a method for preparing the same.

First claim

What is claimed is:

1 . A composite for a porous transport layer, the composite containing:
a particulate substrate containing at least one selected from a group consisting of an oxide of a first metal and a second metal; and nanoparticles of a third metal formed on a surface of the particulate substrate.

2 . The composite of claim 1 , wherein each of the second metal and the third metal independently includes at least one selected from a group consisting of titanium (Ti), zirconium (Zr), niobium (Nb), hafnium (Hf), tantalum (Ta), and tungsten (W).

3 . The composite of claim 1 , wherein the oxide of the first metal includes an oxide of at least one metal selected from a group consisting of zirconium (Zr) and cerium (Ce), doped with at least one metal selected from a group consisting of scandium (Sc), yttrium (Y), and a lanthanide.

4 . The composite of claim 1 , wherein the nanoparticles of the third metal additionally includes at least one precious metal selected from a group consisting of gold (Au), platinum (Pt), palladium (Pd), rhodium (Rh), ruthenium (Ru), and iridium (Ir).

5 . The composite of claim 1 ,
wherein the particulate substrate has an average particle diameter of 20 μm to 50 μm, and wherein the nanoparticles of the third metal have an average particle diameter of 10 nm to 50 nm.

6 . A porous sintered body including a sintered body of the composite for the porous transport layer of claim 1 .

7 . The porous sintered body of claim 6 , wherein the sintered body has an average pore diameter of 5 μm to 30 μm and an average porosity of 30% to 60%.

8 . A porous transport layer containing the porous sintered body of claim 6 .

9 . A water electrolysis cell or fuel cell including the porous transport layer of claim 8 .

10 . A method for preparing a composite for a porous transport layer, the method comprising:
preparing a mixture by mixing a particulate substrate containing at least one selected from a group consisting of an oxide of a first metal and a second metal, and solution containing an ionic precursor of a third metal with each other; and binding the ionic precursor of the third metal to a surface of the particulate substrate by chelating the ionic precursor of the third metal in the mixture.

11 . The method of claim 10 , wherein the binding of the ionic precursor of the third metal includes:
chelating the ionic precursor of the third metal in a cationic form to be changed into a complex compound of the third metal in an anionic form; lowering pH of the mixture to be equal to or lower than an isoelectric point of the particulate substrate to positively charge charges on the surface of the particulate substrate; and electrostatically binding the complex compound of the third metal in the anionic form to the positively charged surface of the particulate substrate.

12 . The method of claim 11 , further including:
drying and heat-treating the particulate substrate having the third metal complex compound-bound surface to form nanoparticles of the third metal on the surface of the particulate substrate.

13 . The method of claim 12 , wherein the heat-treating is performed under at least one gas selected from a group consisting of hydrogen and an inert gas at 400° C. to 700° C.

14 . The method of claim 10 , wherein the binding is performed by stirring the ionic precursor of the third metal at 60 rpm to 360 rpm for 12 to 18 hours.

15 . The method of claim 10 , wherein the solution containing the ionic precursor of the third metal contains at least one solvent selected from a group consisting of an alcohol-based organic solvent and water.

16 . The method of claim 10 , wherein the chelation is performed using a chelating agent containing at least one selected from a group consisting of citric acid and ethylenediamine tetraacetic acid.

17 . A method for preparing a porous sintered body for a water electrolysis cell or a fuel cell, the method comprising:
forming the composite for the porous transport layer prepared by the method for preparing the composite for the porous transport layer of claim 10 , and then sintering the composite to prepare a sintered body of the porous sintered body.

18 . The method of claim 17 , wherein the sintering is performed in a vacuum of equal to or less than 10 −5 mbar and at 900° C. to 1,300° C.

Assignees

• Hyundai Motor Co Ltd
• Kia Corp

Inventors

• Yoon Dae Il

Classifications

• C25B11/031

  Porous electrodes · CPC title

• C25B1/04

  by electrolysis of water · CPC title

• C25B9/23

  comprising ion-exchange membranes in or on which electrode material is embedded · CPC title

• H01M4/8663

  Selection of inactive substances as ingredients for catalytic active masses, e.g. binders, fillers · CPC title

• H01M8/0236

  Glass; Ceramics; Cermets · CPC title