Solid oxide electrolyzer cell including electrolysis-tolerant air-side electrode

Patent metadata

Field	Value
Publication number	US-12460308-B2
Application number	US-202117519996-A
Country	US
Kind code	B2
Filing date	Nov 5, 2021
Priority date	Nov 5, 2021
Publication date	Nov 4, 2025
Grant date	Nov 4, 2025

Abstract

A solid oxide electrolyzer cell (SOEC) includes a solid oxide electrolyte, a fuel-side electrode disposed on a fuel side of the electrolyte, and an air-side electrode disposed on an air side of the electrolyte. The air-side electrode includes a barrier layer disposed on the air side of the electrolyte and including a first doped ceria material, and a functional layer disposed on the barrier layer and including an electrically conductive material and a second doped ceria material.

First claim

What is claimed is:

1 . A solid oxide electrolyzer cell (SOEC) comprising:
a solid oxide electrolyte; a fuel-side electrode disposed on a fuel side of the electrolyte; and an air-side electrode disposed on an air side of the electrolyte, the air-side electrode comprising:
a barrier layer disposed on the air side of the electrolyte and comprising a first samarium-doped ceria (SDC) material as a first doped ceria material;
a functional layer disposed on the barrier layer and comprising an electrically conductive material and a second doped ceria material comprising a second samarium-doped ceria (SDC) material wherein:
the electrically conductive material comprises lanthanum strontium cobalt ferrite (LSCF) represented by a formula (La x Sr 1-x ) y Co z Fe 1-z O 3-δ , wherein x ranges from 0.4 to 0.8, y ranges from 0.94 to 1.0, z ranges from 0.01 to 0.99, and δ is an equilibrium oxygen deficiency which ranges from 0 to 0.1; and
the second SDC material is represented by a formula Ce 1-x Sm x O 2-d , wherein x ranges from 0.1 to 0.3, and d ranges from 0 to 0.2; and

an electrically-conductive perovskite current collector layer disposed on the air side of the functional layer opposite the barrier layer.

2 . The SOEC of claim 1 , wherein the first SDC material is represented by a formula Ce 1-x Sm x O 2-d , wherein x ranges from 0.1 to 0.3, and d ranges from 0 to 0.2.

3 . The SOEC of claim 2 , wherein the first SDC material comprises Ce 0.8 Sm 0.2 O 2-d , Ce 0.9 Sm 0.1 O 2-d , or Ce 0.7 Sm 0.3 O 2-d , wherein d ranges from 0 to 0.1.

4 . The SOEC of claim 1 , wherein the electrically-conductive perovskite current collector layer comprises lanthanum strontium manganite (LSM), lanthanum strontium cobalt ferrite (LSCF), lanthanum strontium cobalt manganite (LSCM), lanthanum strontium ferrite (LSF), or lanthanum strontium nickel chromite (LSCN).

5 . The SOEC of claim 4 , wherein the electrically-conductive perovskite current collector layer comprises the lanthanum strontium cobalt ferrite (LSCF).

6 . The SOEC of claim 1 , wherein the LSCF comprises La 0.58 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ .

7 . The SOEC of claim 1 , wherein the LSCF comprises (La 0.6 Sr 0.4 ) 0.98 Co 0.2 Fe 0.8 O 3-δ .

8 . The SOEC of claim 1 , wherein the LSCF comprises (La 0.6 Sr 0.4 ) 0.95 Co 0.2 Fe 0.8 O 3-δ .

Assignees

• Bloom Energy Corp

Inventors

• Armstrong Tad
• Railsback Justin

Classifications

• C25B13/02

  characterised by shape or form · CPC title

• C25B1/04 Primary

  by electrolysis of water · CPC title

• C25B9/65

  Means for supplying current; Electrode connections; Electric inter-cell connections · CPC title

• C25B9/19

  with diaphragms · CPC title

• C25B9/70

  Assemblies comprising two or more cells · CPC title