Electrolyzer Water Impurity Removal for Efficiency Recovery
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Solution Overview
Problem
Existing electrolyzer devices face durability and efficiency challenges due to impurities in water electrolysis, particularly in AEMELs, which degrade components and increase costs.
Innovation Solution
Development of novel electrolyzer designs and impurity removal components, including innovative materials and processes to stack operation, which enhance durability and high current density in electrolyzers, particularly for electrolysis, and strategies to recover cell efficiency, employing materials such as anionic exchange membranes and stainless steel components, and impurity removal systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If AEMELs operate with water containing trace impurities, then capital expenditure is reduced through use of inexpensive polymeric membrane materials and low-cost non-precious metal catalysts, but device durability deteriorates with lifespan only approximately a few 100s of hours
Solution Approach 1:
The patent applies preliminary action by implementing impurity removal systems and protective measures before the impurities can cause damage to the AEMEL components. This includes pre-treatment of water to remove trace impurities and protective coatings on catalysts and membranes to prevent degradation from remaining impurities, thereby extending device lifespan while maintaining cost-effectiveness
Solution Approach 2:
The patent introduces intermediary protective layers and filtration systems that mediate between the impure water and the sensitive AEMEL components. These intermediaries include protective coatings on non-precious metal catalysts and selective membranes that allow water passage while blocking harmful impurities, enabling the system to operate with cheaper materials while maintaining durability
2Ease of manufacture
If stainless steel components are used in electrolyzer stacks, then manufacturing cost is reduced, but hazardous ions such as hexavalent chromium are generated during operation
Solution Approach 1:
The patent converts the harmful effect of stainless steel corrosion into a beneficial outcome by designing controlled oxidation environments and protective coatings that prevent the formation of hazardous hexavalent chromium while allowing controlled corrosion products to serve as protective layers. This approach maintains the cost advantage of stainless steel while eliminating its harmful effects
Solution Approach 2:
The patent applies parameter changes by modifying operational conditions such as pH, potential, and temperature to prevent the formation of hexavalent chromium from stainless steel components. By controlling these parameters, the system maintains stainless steel's cost benefits while avoiding the generation of hazardous ions through optimized electrochemical conditions
3Productivity
If PEM electrolyzers operate with high water purity requirements, then device efficiency is maintained, but balance of plant cost increases significantly
Solution Approach 1:
The patent applies partial action by implementing selective impurity removal rather than complete purification. The system removes only the most harmful impurities that affect PEM performance while allowing less critical impurities to remain, thereby maintaining high device efficiency while significantly reducing the cost and complexity of the water purification system
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 systems and methods significantly extend electrolyzer lifespan to 2000 hours, maintain safe operation by reducing hazardous hexavalent chromium, and recover cell efficiency through impurity management.
Implementation Method 1
anionic exchange membranes capable of operating with a range of temperatures (0-160° C.)
Implementation Method 2
Water electrolysis, also known as 'water splitting,' forms oxygen gas (O2) and hydrogen gas (H2) by decomposing liquid water (H2O)
Implementation Method 3
impurity removal components, including innovative materials and processes to stack operation
Data Source
AI summary
An impurity removal system for process water for an electrolytic cell.