Solid Oxide Cell Oxidation Barrier Layer for Co-Firing Stability

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing solid oxide fuel cells (SOFCs) face challenges such as deformation due to differential shrinkage during co-firing and vulnerability to damage from oxidizing environments in the anode cavity.

Innovation Solution

A solid oxide cell configuration that includes a porous cermet oxidation barrier layer (OBL) comprising yttria-stabilized zirconia and transition metals like nickel, cobalt, and iron, which helps minimize deformation and provides an oxidation barrier.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a porous cermet oxidation barrier layer is added to protect against oxidation, then reliability is improved, but device complexity increases

Engineering Contradiction:

Improveoxidation resistanceVSAvoidlayer structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines the oxidation barrier function with the anode support structure by creating a porous cermet layer that serves both as a mechanical support and an oxidation protection layer. This merging of functions reduces the need for separate protective layers while maintaining structural integrity and oxidation resistance.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The oxidation barrier layer is constructed using composite cermet materials containing nickel, cobalt, and iron oxides combined with electrolyte materials. This composite structure provides both mechanical strength and oxidation resistance, allowing the layer to protect against oxidation while maintaining device simplicity.

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If multiple layers with differing materials are co-fired, then manufacturing is enabled, but manufacturing precision deteriorates due to differential shrinkage

Engineering Contradiction:

Improveco-firing capabilityVSAvoidcell deformation

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent modifies the material composition and thermal properties of the porous cermet oxidation barrier layer to match the shrinkage characteristics of the anode support during co-firing. By adjusting parameters such as particle size distribution, binding agent content, and oxide composition, the layer undergoes coordinated shrinkage with the support structure, minimizing differential stress and preventing cell deformation.

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If the anode is exposed to oxidizing environment during shutdown, then operational flexibility is improved, but strength deteriorates due to nickel oxidation

Engineering Contradiction:

Improveshutdown capabilityVSAvoidanode structural integrity

Core Design Contradiction:

Adaptability or versatilityVSStrength

Solution Approach 1:

The patent converts the harmful effect of oxidation into a beneficial protective mechanism. The porous cermet oxidation barrier layer is designed to preferentially oxidize first, forming a protective oxide scale that prevents oxygen from reaching and oxidizing the nickel in the anode support. This controlled oxidation of the barrier layer protects the structural integrity of the anode during shutdown and emergency conditions.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The proposed configuration effectively reduces deformation and enhances the cell's resistance to oxidation, leading to improved performance and durability of the solid oxide fuel cell.

Implementation Method 1

a porous cermet oxidation barrier layer (OBL) comprising a first OBL surface and a second OBL surface, with the first OBL surface contacting the second AS surface and the second OBL surface being exposed to the reducing atmosphere. The OBL may include yttria-stabilized zirconia and about 35 vol. % to about 70 vol. % of transition metals selected from nickel and one or both of cobalt and iron

Methodology Applied

Scientific EffectOxidation: Oxidation

Implementation Method 2

The solid electrolyte membrane separates the reactants, transfers the charge in the form of ions, and, at the same time, prevents an electron short circuit between the two electrodes of the solid electrolyte. For this purpose, the solid electrolyte membrane has a low electronic conductivity while at the same time having a high ionic conductivity

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Implementation Method 3

Solid oxide fuel cells (SOFCs) are an energy generation technology that produce electricity quietly, cleanly, and efficiently through the direct electrochemical combination of a fuel with an oxidant

Methodology Applied

Scientific EffectElectrochemical reaction: Fuel Cell

Data Source

PatentUS20250030027A1Redox mitigating solid oxide cell compositions

Publication Date: 2025.01.23 VERSA POWER SYST LTD

AI summary

A solid oxide cell includes a porous solid cathode layer including a first cathode surface and a second cathode surface; a solid electrolyte layer including a first electrolyte surface and a second electrolyte surface, with the first electrolyte surface disposed toward the second cathode surface; a porous cermet anode functional layer (AFL) including a first AFL surface and a second AFL surface, the first AFL surface contacting the second electrolyte surface; a porous cermet anode substrate (AS) including a first AS surface and a second AS surface, the first AS surface contacting the second AFL surface; and a porous cermet oxidation barrier layer (OBL) including a first OBL surface and a second OBL surface, the first OBL surface contacting the second AS surface.