Barium Sulfate Separator for Alkaline Electrolysis
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Solution Overview
Problem
The high cost of zirconium oxide-based separators for alkaline water electrolysis makes hydrogen production less cost-effective, necessitating the development of more affordable yet high-quality separators.
Innovation Solution
A separator comprising a porous hydrophilic layer with barium sulfate particles of 0.7 μm or less in size, combined with a porous support, is developed, where the dope solution is applied on both sides of the support and undergoes phase inversion to form a three-dimensional polymer network, ensuring efficient ion transport and mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If zirconium oxide particles are used in the separator, then the ionic conductivity and separation performance are improved, but the production cost increases significantly
Solution Approach 1:
The patent replaces expensive zirconium oxide particles with cheaper barium sulfate particles as the hydrophilic inorganic particles in the porous hydrophilic layer. This substitution maintains the necessary ionic conductivity and separation performance while significantly reducing the production cost of the separator, directly addressing the technical contradiction between reliability and manufacturing cost.
Solution Approach 2:
The patent changes the particle size parameter of the barium sulfate particles to D50 of 0.7 μm or less, which optimizes the pore structure and ionic conductivity of the separator. This parameter optimization ensures that the cheaper alternative material achieves performance comparable to zirconium oxide, resolving the contradiction between cost reduction and performance maintenance.
2Ease of manufacture
If larger inorganic particles are used in the separator, then the manufacturing process is simplified, but the ionic resistance increases and ion transport efficiency decreases
Solution Approach 1:
The patent specifies a particle size D50 of 0.7 μm or less for barium sulfate particles, which is an optimized parameter that balances manufacturing ease with ionic transport efficiency. This particle size creates appropriate pore structures that maintain low ionic resistance while remaining practical for manufacturing processes.
Solution Approach 2:
The patent uses porous barium sulfate particles with controlled size to create an optimized pore structure in the hydrophilic layer. This porous structure facilitates efficient OH- ion transport from cathode to anode while maintaining the mechanical integrity of the separator, resolving the contradiction between manufacturing simplicity and ionic resistance.
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 use of barium sulfate particles with a D50 of 0.7 μm or less in the separator reduces ionic resistance and production costs, enhancing the efficiency and cost-effectiveness of hydrogen production in alkaline water electrolysis.
Implementation Method 1
the dope solution is applied on both sides of the support and undergoes phase inversion to form a three-dimensional polymer network
Implementation Method 2
the separator should also be a highly ionic conductor for transportation of OH− ions from the cathode to the anode
Data Source
AI summary
A separator for alkaline water electrolysis (1) comprising a porous hydrophilic polymer layer (20), the porous hydrophilic polymer layer comprising a polymer resin and hydrophilic inorganic particles, characterized in that the inorganic particles are barium-sulfate particles having a particle size D50 of 0.7 pm or less.