Layered Hydrogel Bipolar Membrane With Bimetallic Hydroxide Catalysts
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Solution Overview
Problem
Existing bipolar membranes suffer from poor stability and limited water dissociation efficiency due to catalysts that are not closely bound with the anion and cation exchange membrane layers, leading to membrane delamination and increased water dissociation voltage.
Innovation Solution
A layered bimetallic hydroxide-based hydrogel bipolar membrane is prepared by blade-coating quaternized polyethersulfone anion exchange membrane solutions, followed by hydrogel cross-linking with sodium alginate and metal ions, and then coating sulfonated polyethersulfone cation exchange resin, resulting in a tightly bound membrane structure with improved catalytic active sites.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional catalysts are used in the intermediate interface layer, then water dissociation rate is improved, but catalyst stability and membrane binding are worsened
Solution Approach 1:
The patent uses a composite structure consisting of an anion exchange membrane layer, a cation exchange membrane layer, and an intermediate interface layer containing catalyst particles. This composite material approach allows the catalyst to be embedded within the membrane structure, improving both water dissociation rate and stability by preventing catalyst release while maintaining binding between membrane layers.
Solution Approach 2:
The intermediate interface layer is designed with localized catalyst distribution at the interface between anion and cation exchange membrane layers. This local quality enhancement concentrates catalytic activity where water dissociation is most needed, improving water dissociation rate while the localized structure prevents catalyst migration and maintains membrane binding.
2Productivity
If catalyst efficiency is increased, then water dissociation performance is improved, but membrane delamination is worsened
Solution Approach 1:
The patent merges the catalyst layer with the intermediate interface layer between the anion and cation exchange membranes. This combining ensures that high-efficiency catalysts are integrated into the membrane structure, improving water dissociation performance while the unified structure prevents membrane delamination by eliminating separate catalyst layers that could detach.
Solution Approach 2:
The intermediate interface layer acts as an intermediary between the anion and cation exchange membrane layers, containing the catalyst particles. This intermediary structure mediates between the two membrane layers, ensuring strong binding while providing a stable environment for high-efficiency catalysts to enhance water dissociation performance.
3Use of energy by moving object
If water dissociation voltage is reduced, then energy consumption is improved, but catalyst binding strength is worsened
Solution Approach 1:
The catalyst particles are pre-loaded into the intermediate interface layer during membrane fabrication, before the membrane is put into service. This preliminary action ensures strong binding between catalyst and membrane structure from the outset, allowing the membrane to operate at low water dissociation voltage without worrying about catalyst detachment during operation.
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 new membrane design enhances water dissociation efficiency, stability, and reduces energy consumption by ensuring the catalysts are uniformly distributed and closely bound, facilitating rapid water dissociation at low voltage.
Implementation Method 1
A bipolar membrane is a new type of composite ion exchange membrane including an anion exchange membrane layer, a cation exchange membrane layer, and an intermediate interface layer
Implementation Method 2
water molecules located in the intermediate interface layer will undergo a water dissociation reaction, thereby generating hydrogen ions and hydroxide ions to load the current
Implementation Method 3
under the action of the electric field, the hydrogen ions and the hydroxide ions move to the polar chambers on two sides of the bipolar membrane
Data Source
AI summary
The present disclosure relates to a layered bimetallic hydroxide-based hydrogel bipolar membrane and a method for preparing the same. The method includes: blade-coating a quaternized polyethersulfone solution on a substrate, and carrying out drying to obtain an anion exchange layer; immersing the layer sequentially and cyclically in a sodium alginate solution and a first metal ion mixed solution to obtain a hydrogel anion exchange membrane; immersing the hydrogel membrane sequentially in a second metal ion mixed solution and an alkaline solution; and blade-coating a sulfonated polyethersulfone solution on the obtained membrane, and carrying out drying to obtain the layered bimetallic hydroxide-based hydrogel bipolar membrane. The anion and cation exchange membrane layers on two sides of the bipolar membrane prepared in the present disclosure are closely bound by way of hydrogel cross-linking. The bipolar membrane has the advantages of high water dissociation efficiency, low energy consumption, and good stability.