Bipolar Membrane Electrospinning Delamination Resistance
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Solution Overview
Problem
Conventional 2D interface bipolar membranes suffer from delamination, also known as ballooning, due to osmotic pressure build-up during start-ups and shut-downs of electrodialysis systems, which is exacerbated by the batch-wise manufacturing process.
Innovation Solution
A method for assembling a bipolar membrane using electrospinning, centrifugal spinning, or electrocentrifugal spinning to create evenly coupled layers, including a cation exchange layer, a junction layer, and an anion exchange layer, without physical attachment, thereby reducing delamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hot pressing or casting methods are used to join cation exchange layer and anion exchange layer, then the manufacturing process is simple, but delamination occurs due to osmotic pressure build-up during start-ups and shut-downs
Solution Approach 1:
The bipolar membrane is divided into multiple discrete layers (cation exchange layer, junction layer, anion exchange layer) that are assembled in a specific sequence through electrospinning. This segmentation allows each layer to be independently optimized and assembled with controlled interfaces, preventing delamination while maintaining manufacturing feasibility through modular construction
Solution Approach 2:
A junction layer is introduced as an intermediary between the cation exchange layer and anion exchange layer. This junction layer acts as a mediator that manages the interface between the two exchange layers, distributing osmotic pressure evenly and preventing direct contact that would cause delamination, while the entire structure is assembled through electrospinning
2Reliability
If batch-wise manufacturing process is used, then production flexibility is maintained, but delamination problem is exacerbated due to pressure build-up
Solution Approach 1:
The bipolar membrane structure is pre-assembled with proper layer sequencing and interface configuration through electrospinning before deployment. The junction layer is pre-positioned to manage future osmotic pressure, and the layered structure is pre-optimized to prevent delamination during batch operations, allowing flexible manufacturing without compromising stability
Solution Approach 2:
The electrospinning process enables precise control of layer thickness, porosity, and material composition parameters. By optimizing these parameters during manufacturing, the membrane structure can accommodate batch-wise production cycles while maintaining delamination resistance through controlled pressure distribution and enhanced interfacial bonding
3Reliability
If 2D interface structure is used, then water splitting function is achieved, but delamination occurs at the junction interface
Solution Approach 1:
The membrane structure transitions from a simple 2D interface between cation and anion exchange layers to a multi-layered 3D structure with the junction layer inserted between them. This dimensional expansion creates a more robust interface that manages pressure distribution in multiple directions, preventing delamination while maintaining the water splitting function through the layered architecture
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 method results in a bipolar membrane that is less prone to delamination, more chemically resistant, and mechanically stable, achieving efficient water dissociation with lower transmembrane voltage compared to conventional membranes.
Implementation Method 1
electrospinning and/or centrifugal spinning and/or electrocentrifugal spinning a first cation exchange layer comprising a first water splitting catalyst and a first cation exchange polymer
Implementation Method 2
electrospinning and/or centrifugal spinning and/or electrocentrifugal spinning a junction layer
Implementation Method 3
electrospinning and/or centrifugal spinning and/or electrocentrifugal spinning a first anion exchange layer comprising a second water splitting catalyst and a first anion exchange polymer
Implementation Method 4
electrospinning and/or centrifugal spinning and/or electrocentrifugal spinning a first anion exchange layer comprising a second water splitting catalyst and a first anion exchange polymer
Implementation Method 5
delamination, also referred to as ballooning, which can occur at the junction of the interface between the anion exchange layers and cation exchange layer due to (osmotic) pressure build-up
Data Source
AI summary
The invention relates to a method for assembling a bipolar membrane, and bipolar membrane thereof. The method comprises the steps of electrospinning and centrifugal spinning and electrocentrifugal spinning a first cation exchange layer comprising a first water splitting catalyst and a first cation exchange polymer, electrospinning and centrifugal spinning and electrocentrifugal spinning a junction layer. Further, the method comprises electrospinning and centrifugal spinning and electrocentrifugal spinning a first anion exchange layer comprising a second water splitting catalyst and a first anion exchange polymer. A system comprising a bipolar membrane according to the invention is also disclosed.