Electrolysis Cell Frame Structure for Oxidation-Resistant Sealing
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Solution Overview
Problem
Oxygen generated during water electrolysis causes oxidation degradation of the frame body, leading to a decrease in sealing properties and durability of the water electrolysis cell.
Innovation Solution
A water electrolysis cell design with a frame body having a multi-layer structure, where the first resin layer closer to the membrane-electrode assembly contains a higher concentration of antioxidant, particularly a chelating agent, to mitigate oxidation degradation and inactivate metal ions, thereby enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resin frame body is used in the water electrolysis cell, then the sealing properties are secured, but oxidation degradation occurs due to oxygen generated during electrolysis, reducing durability
Solution Approach 1:
The frame body is constructed as a composite material by incorporating an antioxidant into the resin matrix. This composite structure combines the sealing properties of resin with the protective function of the antioxidant, allowing the frame to resist oxidation degradation while maintaining its sealing capability throughout the operational duration.
Solution Approach 2:
The antioxidant acts as an intermediary substance between the oxygen generated during electrolysis and the resin frame body. It intercepts and neutralizes the oxidizing effect of oxygen before it can degrade the resin, thereby protecting the frame body and maintaining both sealing properties and durability.
2Reliability
If a high concentration of antioxidant is added to the frame body, then oxidation degradation is mitigated, but the amount of chelating agent increases, potentially causing catalyst poisoning
Solution Approach 1:
The patent applies local quality by concentrating the antioxidant in the frame body where oxidation resistance is most needed - at the peripheral edge portion of the membrane-electrode assembly where oxygen generation and oxidation degradation are most severe. This localized approach provides effective protection without requiring high antioxidant concentrations throughout the entire frame body, thereby minimizing chelating agent usage and reducing catalyst poisoning risk.
Solution Approach 2:
The patent optimizes the concentration parameter of the antioxidant in the frame body to achieve the minimum effective level for preventing oxidation degradation. By carefully controlling and adjusting the antioxidant concentration parameter, the invention achieves sufficient oxidation resistance while minimizing the amount of chelating agent present, thus avoiding catalyst poisoning.
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 design effectively reduces oxidation degradation and maintains sealing properties by using a higher antioxidant concentration in the first resin layer, while minimizing the amount of chelating agent needed, thus improving the cell's durability and preventing catalyst poisoning.
Implementation Method 1
When oxygen causes oxidation degradation of the frame body at a peripheral edge portion of the membrane-electrode assembly
Implementation Method 2
The antioxidant may include a chelating agent. Metal ions having flowed out of the membrane-electrode assembly sometimes promote oxidation degradation of the frame body. In the above-described configuration, metal ions having flowed out can be inactivated by the chelating agent.
Implementation Method 3
During water electrolysis, oxygen is generated
Data Source
AI summary
A water electrolysis cell includes a membrane-electrode assembly, a frame body made of resin that is provided along a peripheral edge of the membrane-electrode assembly, and a first separator and a second separator that face each other through the membrane-electrode assembly and the frame body and are joined to each other by the frame body. An outer peripheral portion of the membrane-electrode assembly is extended to between a first face of the frame body and the first separator. A surface of the first face includes an antioxidant.