SOEC Air-Side Electrode Layers to Prevent Electrolysis Delamination

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Solution Overview

Problem

Solid oxide reversible fuel cell systems suffer from air-side electrode degradation due to cell voltage increases during the electrolysis process, leading to delamination issues.

Innovation Solution

Incorporation of a barrier layer comprising a doped ceria material and a functional layer with an electrically conductive material on the air-side electrode to reduce overpotential and prevent delamination.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a conventional air-side electrode is used in solid oxide reversible fuel cell systems, then the system can operate in both fuel cell mode and electrolysis mode, but the air-side electrode degrades due to cell voltage increases during electrolysis, leading to delamination

Engineering Contradiction:

Improveoperational mode flexibilityVSAvoidelectrode stability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The air-side electrode is segmented into multiple functional layers: a barrier layer (first doped ceria material) directly on the electrolyte, and a functional layer (electrically conductive material and second doped ceria material) on top of the barrier layer. This segmentation allows each layer to perform specific functions - the barrier layer prevents oxygen ion crossover and reduces overpotential, while the functional layer provides electrical conductivity and catalytic activity, thereby resolving the contradiction between operational flexibility and electrode stability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The air-side electrode uses composite materials consisting of doped ceria materials combined with electrically conductive materials. The doped ceria provides oxygen ion conductivity and electrochemical stability, while the electrically conductive material ensures electron transport. This composite structure maintains performance in both fuel cell and electrolysis modes while preventing delamination, thus resolving the contradiction between adaptability and reliability

Inventive Principle:

Principle #40Composite materials

2Productivity

If the air-side electrode operates during electrolysis process, then hydrogen can be generated by electrolyzing water, but cell voltage increases cause air-side electrode degradation

Engineering Contradiction:

Improvehydrogen production capabilityVSAvoidelectrode integrity

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The barrier layer acts as an intermediary between the electrolyte and the functional layer during electrolysis. It mediates the oxygen ion flux, preventing excessive oxygen ion crossover to the air-side electrode that would cause degradation. This intermediary layer reduces overpotential and protects the electrode structure while allowing hydrogen production to proceed, resolving the contradiction between productivity and reliability

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The use of doped ceria materials changes the electrochemical parameters of the air-side electrode, specifically improving oxygen ion conductivity and reducing overpotential during electrolysis. This parameter change allows the electrode to withstand the harsh conditions of electrolysis mode without degradation, enabling sustained hydrogen production while maintaining electrode integrity

Inventive Principle:

Principle #35Parameter changes

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 doped ceria-based barrier and functional layers effectively suppress air-side electrode delamination, maintaining cell integrity and performance under electrolysis conditions.

Implementation Method 1

air-side electrode degradation due to cell voltage increases that may occur during the electrolysis process

Methodology Applied

Scientific EffectIon crossover: Ion Repulsion/Attraction

Implementation Method 2

solid oxide electrolyzer cell (SOEC) includes a solid oxide electrolyte

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Implementation Method 3

functional layer disposed on the barrier layer and comprising an electrically conductive material

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS20260043159A1Solid oxide electrolyzer cell including electrolysis-tolerant air-side electrode

Publication Date: 2026.02.12 BLOOM ENERGY CORP

AI summary

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.