Method for preparing fuel electrode of solid oxide electrolysis cells embedded with bimetallic catalyst

Patent metadata

Field	Value
Publication number	US-9970118-B2
Application number	US-201615390462-A
Country	US
Kind code	B2
Filing date	Dec 23, 2016
Priority date	Sep 7, 2016
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

A method for uniformly forming a nickel-metal alloy catalyst in a fuel electrode of a solid oxide electrolysis cell is provided.
Specifically, before the nickel-metal alloy catalyst is formed, a metal oxide is uniformly distributed on nickel oxide contained in the fuel electrode through infiltration of a metal oxide precursor solution and hydrolysis of urea.

First claim

What is claimed is:

1. A method for preparing an alloy catalyst-supported fuel electrode of a solid oxide electrolysis cell, comprising:
(1) preparing a solid oxide electrolysis cell wherein a fuel electrode containing nickel oxide (NiO), an electrolyte and an air electrode are sequentially stacked;
(2) forming a nano-sized metal oxide on the nickel oxide contained in the fuel electrode; and
(3) forming a nickel-metal alloy catalyst by reducing the nickel oxide and the metal oxide, wherein (2) includes:
(2-1) mixing a metal oxide precursor, urea and a solvent;
(2-2) infiltrating the mixture solution obtained in (2-1) into the fuel electrode;
(2-3) forming a metal hydroxide or a metal hydroxycarbonate on a surface of the nickel oxide by heat-treating the fuel electrode that passed through (2-2); and
(2-4) removing the solvent and forming the metal oxide on the surface of the nickel oxide by heat-treating the fuel electrode that passed through (2-3).

2. The method for preparing an alloy catalyst-supported fuel electrode of a solid oxide electrolysis cell according to claim 1 , wherein (2-3) is performed at 80-100 ° C. for 2-4 hours.

3. The method for preparing an alloy catalyst-supported fuel electrode of a solid oxide electrolysis cell according to claim 1 , wherein (2-4) is performed at 250-400 ° C. for 1-2 hours.

4. The method for preparing an alloy catalyst-supported fuel electrode of a solid oxide electrolysis cell according to claim 1 , wherein, in (2-1), the metal oxide precursor and the urea are mixed at a molar ratio of 1:10 to 1:6.

5. The method for preparing an alloy catalyst-supported fuel electrode of a solid oxide electrolysis cell according to claim 1 wherein, in (2-1), the solvent is a mixture of ethanol with water at a volume ratio of 1:1.7 to 1:0.6.

6. The method for preparing an alloy catalyst-supported fuel electrode of a solid oxide electrolysis cell according to claim 1 , wherein (2-2) through (2-4) are repeated such that the content of the metal oxide becomes 0.25-1.25 mg/cm 2 .

7. The method for preparing an alloy catalyst-supported fuel electrode of a solid oxide electrolysis cell according to claim 1 , wherein, in (3), the nickel oxide and the metal oxide are reduced by heat-treating the fuel electrode that passed through (2) at 600-900 ° C. under a hydrogen atmosphere.

8. The method for preparing an alloy catalyst-supported fuel electrode of a solid oxide electrolysis cell according to claim 1 wherein the metal of the nickel-metal alloy catalyst is selected from platinum (Pt), palladium (Pd), ruthenium (Ru), rhodium (Rh), iron (Fe), copper (Cu) or cobalt (Co).

Assignees

• Korea Inst Sci & Tech

Inventors

• Hong Jong Sup
• Kim Si Won
• Park Man Soo
• Kim Hyoung Chul
• Yoon Kyung Joong
• Son Ji Won
• Lee Jong Ho
• Lee Hae Weon
• Kim Byung Kook

Classifications

• C25B11/0478 Primary

  Chemistry & Metallurgy · mapped topic

• B05D1/30

  performed by gravity only, i.e. flow coating · CPC title

• H01M4/04

  Processes of manufacture in general · CPC title

• H01M4/8605

  Porous electrodes · CPC title

• H01M4/9025

  Oxides specially used in fuel cell operating at high temperature, e.g. SOFC · CPC title