Metal Oxide Coating for Solid Oxide Cell Protection

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Solution Overview

Problem

Solid oxide fuel cell (SOFC) and electrolyzer stacks face challenges with thermal management due to significant thermal gradients, leading to undesirable stresses and inefficiencies, and conventional protective coatings are costly and prone to degradation from chromium compounds, limiting their operational lifetime and efficiency.

Innovation Solution

A high-velocity solution precursor flame spray process is used to form a dense metal oxide coating with nanoscaled particles on metallic structure plates, which are fed into a thermal flame with an average velocity over 200 m/s, preventing corrosion and improving electrical efficiency by reducing chromium transport and oxidation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional protective coatings are applied to cell structure plates, then corrosion resistance is improved, but manufacturing cost increases and coating degradation from chromium compounds occurs

Engineering Contradiction:

Improvecorrosion resistanceVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent replaces expensive conventional protective coatings with a cost-effective spray-dried biomass-derived coating that forms a protective carbonaceous layer. This coating uses readily available biomass materials processed through spray drying, significantly reducing manufacturing costs while providing adequate protection against corrosion and chromium compound degradation in SOFC/electrolyzer environments.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent transforms biomass material through spray drying to create a coating with specific physical and chemical properties. By controlling drying parameters and coating composition, the process creates a stable protective layer that resists degradation from chromium compounds while maintaining cost-effectiveness compared to conventional coating systems.

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If high-velocity spray drying is used to form protective coating, then coating density and adhesion are improved, but process complexity increases

Engineering Contradiction:

Improvecoating densityVSAvoidprocess complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent replaces complex multi-step coating processes with a streamlined spray drying system. The high-velocity spray drying process achieves dense, well-adhered coatings through controlled atomization and rapid drying, eliminating the need for multiple application steps, burn-in procedures, and complex curing cycles required by conventional coating methods.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The spray-dried biomass coating self-forms a protective structure during the drying process. The rapid evaporation of solvent and controlled dehydration create a dense, cross-linked carbonaceous matrix that adheres strongly to the substrate without requiring additional processing steps or complex equipment beyond the spray drying system.

Inventive Principle:

Principle #25Self-service

3Reliability

If thermal flame processing is applied to form metal oxide coating, then coating protection against chromium transport is improved, but energy consumption increases

Engineering Contradiction:

Improveprotection against chromium transportVSAvoidenergy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent utilizes phase transitions of biomass components during spray drying to form the protective coating. The rapid heating and evaporation of moisture, followed by controlled carbonization, create a stable carbonaceous barrier that effectively blocks chromium transport. This phase transition-based approach achieves protective functionality with lower energy input compared to high-temperature thermal flame processing of conventional coatings.

Inventive Principle:

Principle #36Phase transitions

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

This approach enhances the operational lifetime and electrical efficiency of SOFCs and electrolyzers by preventing cathode degradation and minimizing thermal stresses, making the power operation more economical and efficient compared to prior art embodiments.

Implementation Method 1

forming material for protective coating from liquid precursor fed into thermal flame

Methodology Applied

Scientific EffectThermal flame heating: Heating

Implementation Method 2

fed into thermal flame having average gas velocity over 200 m/s

Methodology Applied

Scientific EffectThermal flame gas flow: Convection

Data Source

PatentUS10770735B2Protection arrangement and method of solid oxide cells

Publication Date: 2020.09.08 ELCOGEN

AI summary

An object of the invention is a protection method of solid oxide cells, in which method is arranged gas flows in the cell by at least two cell structure plates made of metal. In the method is formed metal oxide material on metallic structure from liquid precursor containing at least metal ions and at least one of organic and inorganic compounds fed into thermal flame having average gas velocity over 200 m/s.