Nanocatalyst suitable for an anode of a solid oxide fuel cell

Patent metadata

Field	Value
Publication number	US-10923733-B2
Application number	US-201916256905-A
Country	US
Kind code	B2
Filing date	Jan 24, 2019
Priority date	Mar 26, 2018
Publication date	Feb 16, 2021
Grant date	Feb 16, 2021

Abstract

The present disclosure relates to a nanocatalyst for an anode of a solid oxide fuel cell and a method for preparing the same. More particularly, the present disclosure relates to a nanocatalyst for an anode of a solid oxide fuel cell obtained by forming a ceramic nanocatalyst including a noble metal dispersed therein in an atomic unit and contained in an ionic state having an oxidation number other than 0 through an in situ infiltration process in the internal pores of a porous electrode, and to application of the nanocatalyst to a solid oxide fuel cell having significantly higher electrochemical characteristics as compared to the solid oxide fuel cells including the conventional nickel-based anode and oxide anode, and particularly showing excellent characteristics at an intermediate or low temperature of 600° C. or less.

First claim

What is claimed is:

1. A nanocatalyst for an anode of a solid oxide fuel cell formed in internal pores of a porous electrode, the nanocatalyst comprising:
a ceramic that is doped with a plurality of metal particles which are dispersed on a surface of the ceramic, which are present in a mixed form of ions with metal, and which comprise a metal selected from the group consisting of Au, Ag, Pd, Ir, Rh, Ru, Os, and combinations thereof, and that is fluorite represented by Chemical Formula 1 below:
A 1-a-b Ce a Zr b O 2-δ ,

where A is an element selected from the group consisting of Y, Sc, Gd, Sm, La, Nb, Nd, Pr, Yb, Er, Tb and Ca, and
each of a, b and δ is a real number satisfying 0≤a≤1, 0≤b≤1 and 0≤δ≤1,
wherein the ions in the mixed form or ions with metal are an ionic species present in a ratio of 30 wt % or more based on total weight of metallic components as determined by X-ray photoelectron spectroscopy (XPS) analysis.

2. The nanocatalyst according to claim 1 , wherein the metal is present in an amount of 2-6 mol % based on the nanocatalyst.

3. The nanocatalyst according to claim 1 , wherein the nanocatalyst has a particle size of 30-40 nm, and the plurality of metal particles has a particle size of 0.1-1 nm.

4. A nanocatalyst for an anode of a solid oxide fuel cell formed in internal pores of a porous electrode, the nanocatalyst comprising:
a ceramic that is doped with a plurality of metal particles which are dispersed on the ceramic surface and comprise a metal selected from the group consisting of Au, Ag, Pd, Ir, Rh, Ru, Os, and combinations thereof and that is fluorite represented by Chemical Formula 1 below:
A 1-a-b Ce a Zr b O 2-δ ,  Chemical Formula 1

where A is an element selected from the group consisting of Y, Sc, Gd, Sm, La, Nb, Nd, Pr, Yb, Er, Tb and Ca, and
each of a, b and δ is a real number satisfying 0≤a≤1, 0≤b≤1 and 0≤δ≤1,
wherein:
the nanocatalyst includes the metal in an amount of 2-6 mol %;
the nanocatalyst has a particle size of 30-40 nm;
the plurality of metal particles has a particle size of 0.1-1 nm;
the metal particles are present in a mixed form of ions with metal; and
the ions in the mixed form of ions with metal are an ionic species present in a ratio of 30 wt % or more based on total weight of metallic components as determined by X-ray photoelectron spectroscopy (XPS) analysis.

5. The nanocatalyst according to claim 3 , wherein the metal is present in an amount of 2-6 mol % based on the nanocatalyst.

Assignees

• Korea Inst Sci & Tech
• Univ Hanyang Ind Univ Coop Found

Inventors

• Yoon Kyung Joong
• Lee Yun Jung
• Shin Ji-Su
• Park Mansoo
• Ji Ho Il
• Kim Hyoungchul
• Son Ji-Won
• Lee Jong Ho
• Kim Byung Kook
• Lee Hae-Weon

Classifications

• H01M2008/1293

  Fuel cells with solid oxide electrolytes · CPC title

• H01M4/92

  Metals of platinum group (H01M4/94 {, H01M4/9058} take precedence) · CPC title

• H01M4/9025

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

• H01M4/8882

  Heat treatment, e.g. drying, baking · CPC title

• H01M4/885

  followed by reduction of the catalyst salt precursor · CPC title