Composite Hot-BOP Coating to Suppress Chromium Volatilization
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Solution Overview
Problem
Chromium volatilization from Hot-BOP components in solid oxide fuel cells leads to chromium poisoning, causing performance deterioration and hindering commercialization due to the lack of effective surface coating technologies that can suppress chromium volatilization under high-temperature and long-time conditions.
Innovation Solution
A composite coating layer comprising a nickel layer and a lanthanum oxide layer is applied to the surface of solid oxide fuel cell members, specifically designed to suppress chromium volatilization by providing a uniform and effective barrier against high-temperature environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wet powder spraying is used to apply coating layer, then the coating process is simple and convenient for industrial production, but the amount of material used is large and uniformity of coating layer is difficult to control
Solution Approach 1:
The patent replaces the wet powder spraying method with an electrostatic coating method. Instead of using a mechanical spray system that mixes coating material with binder and solvent, the invention uses electrostatic field to deposit dry coating powder onto the BOP surface. This substitution eliminates the need for liquid carriers and allows precise control of coating thickness and uniformity through electrical field parameters, thereby resolving the contradiction between manufacturing ease and coating precision.
2Strength
If chromium is contained in BOP to improve material properties, then the strength and corrosion resistance are enhanced, but chromium volatilization occurs under high temperature causing electrode poisoning
Solution Approach 1:
The patent introduces an aluminum oxide coating layer as an intermediary barrier between the chromium-containing BOP and the electrode. This coating layer physically separates the chromium source from the electrode surface, preventing chromium volatilization and subsequent electrode poisoning while allowing the BOP to retain its chromium-containing alloy composition for strength and corrosion resistance. The aluminum oxide layer acts as a protective mediator that blocks harmful chromium species.
3Power
If high temperature operation is maintained for high efficiency energy production, then the energy conversion efficiency is improved, but chromium volatilization and electrode deterioration are accelerated
Solution Approach 1:
The patent applies the aluminum oxide coating layer to the BOP surface before operation begins. This preliminary protective action creates a barrier that prevents chromium volatilization during subsequent high-temperature operation, thereby maintaining electrode integrity and performance stability over time. The pre-applied coating ensures that when high power operation occurs, the electrode is already protected from chromium poisoning, resolving the contradiction between power output and reliability.
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 composite coating layer significantly reduces chromium volatilization by up to 95.50%, thereby enhancing the durability and performance of solid oxide fuel cell members even under prolonged high-temperature exposure.
Implementation Method 1
the composite coating layer significantly reduces chromium volatilization by up to 95.50%, thereby enhancing the durability and performance of solid oxide fuel cell members even under prolonged high-temperature exposure
Data Source
AI summary
A composite coating layer for a solid oxide fuel cell member according to the present disclosure includes a nickel layer that coats at least a portion of the surface of the solid oxide fuel cell member, and a lanthanum oxide layer that coats at least a portion of the surface of the nickel layer, and thereby, has an effect of suppressing the volatilization of chromium from the solid oxide fuel cell member even under high temperature and long-term conditions.