Electrochemical Cell Water Deionization Using Regenerable Chelation
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Solution Overview
Problem
The degradation of components in hydrogen electrochemical cells, such as fuel cells and electrolyzers, due to metal ions from impure water sources reduces efficiency and longevity, necessitating effective deionization methods to prevent membrane degradation and maintain performance.
Innovation Solution
A hydrogen electrochemical stack and deionization system incorporating a deionizing additive, like chelating agents, that selectively binds metal ions while leaving hydrogen ions unaffected, combined with a regeneration device and water permeable membranes, ensures efficient removal and recycling of unwanted ions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If deionizing additive is added to remove metal ions, then membrane degradation is prevented and component reliability is improved, but device complexity increases due to additional components and regeneration systems
Solution Approach 1:
A deionizing additive is introduced as an intermediary substance that selectively binds to metal ions in the water stream, preventing them from reaching and degrading the membrane. The additive acts as a mediator between the impure water source and the electrochemical cell, capturing harmful ions through chelation or ion exchange mechanisms while allowing clean water to pass through to the membrane.
Solution Approach 2:
The system implements a regeneration mechanism where the deionizing additive, after binding metal ions and becoming saturated, is diverted to a regeneration device. There, the bound metal ions are removed from the additive through electrochemical or chemical processes, restoring the additive's ion-binding capacity. The regenerated additive is then returned to the water stream for continued use, creating a closed-loop system that recovers and reuses the deionizing agent.
2Productivity
If deionization additive is used to capture metal ions, then efficiency is maintained, but loss of substance occurs due to additive consumption and metal ion accumulation
Solution Approach 1:
The regeneration device recovers the deionizing additive by removing bound metal ions through electrochemical or chemical processes. The regenerated additive is returned to the water stream for continued use, while the concentrated metal ions are discarded. This closed-loop approach minimizes substance loss by continuously reusing the deionizing agent rather than consuming it.
Solution Approach 2:
The system changes the chemical state of the deionizing additive during operation. The additive cycles between a free state (ready to bind ions), a bound state (saturated with metal ions), and a regenerated state (after treatment in the regeneration device). These parameter changes allow the additive to repeatedly capture and release metal ions, maintaining efficiency while reducing substance consumption.
3Manufacturing precision
If water permeable membrane is used to separate ions, then deionization effectiveness is improved, but device complexity increases due to membrane integration requirements
Solution Approach 1:
The water permeable membrane serves as a physical intermediary that separates the water stream into purified and concentrated streams. It allows water molecules to pass through while blocking the passage of deionized water and metal ion complexes, creating distinct zones for deionization and concentration processes. This membrane-based separation enhances deionization effectiveness by providing a physical barrier that directs ion flow.
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 system effectively captures and removes metal ions, preventing membrane degradation and maintaining the efficiency and longevity of hydrogen electrochemical cells by using chelating agents and regeneration processes, allowing for continuous operation and extended lifespan.
Implementation Method 1
a deionizing additive selectively binding the metal ions and non-binding to hydrogen ions. The deionizing additive may be a chelating agent.
Implementation Method 2
The deionization additive may be an ionophore. The deionization additive may be a chelating agent including a metal ion receptor.
Implementation Method 3
a water permeable membrane impermeable to additive-bound ions
Implementation Method 4
a water permeable membrane impermeable to additive-bound ions
Implementation Method 5
The deionizing additive and the membrane both including a hydrogel. The water permeable membrane may include a hydrogel.
Implementation Method 6
The regeneration device may be an electrochemical regeneration device.
Data Source
AI summary
A hydrogen electrochemical stack includes a plurality of hydrogen electrochemical cells, a common water input source upstream from the plurality of hydrogen electrochemical cells, the common water input source including a water stream with metal ions, and a deionizing additive source including a deionizing additive selectively binding the metal ions and non-binding to hydrogen ions.