Alkaline Electrolysis Separator with Lateral Bubble Point
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Solution Overview
Problem
In alkaline water electrolysis, voids at the interface between porous polymer layers and the porous support lead to gas bubble formation, reducing ion conductivity and efficiency, and potentially causing hot spots or burning of the separator due to lateral migration of gas bubbles.
Innovation Solution
A reinforced separator with a lateral Bubble Point of at least 0.2 bar, achieved by impregnating the porous support with a dope solution containing a polymer resin and hydrophilic inorganic particles, which forms a three-dimensional porous network that extends into the support, reducing void formation and enhancing adhesion, and optimizing pore diameter and porosity to prevent gas crossover while ensuring efficient hydroxyl ion transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a porous support is used to reinforce the separator, then mechanical strength and ease of manipulation are improved, but voids form at the interface between porous polymer layers and support leading to gas bubble formation and reduced ion conductivity
Solution Approach 1:
The porous support is pre-treated with a plasma process before applying the porous polymer layer. This preliminary action creates surface characteristics on the support that promote better adhesion and reduce void formation at the interface, thereby preventing gas bubble accumulation while maintaining mechanical strength
Solution Approach 2:
The invention creates a composite structure consisting of the porous support and porous polymer layer with optimized interfacial bonding. The composite achieves both mechanical reinforcement from the support and high ion conductivity by minimizing voids through the plasma treatment and controlled layer formation
2Reliability
If gas bubbles form in the separator, then lateral migration of gas bubbles occurs causing hot spots or burning, but preventing gas bubble formation requires eliminating interface voids without compromising separator structure
Solution Approach 1:
The plasma treatment process, which could be seen as an additional complex step, actually converts a potential harm (interface voids) into a benefit (improved adhesion and void-free interface). The plasma creates surface activation and roughness that promotes intimate contact between layers, eliminating the root cause of gas bubble formation
Solution Approach 2:
The plasma treatment is applied in advance to prevent the formation of interface voids before the porous polymer layer is deposited. This preliminary anti-action counteracts the tendency toward void formation by modifying the support surface properties beforehand, ensuring proper adhesion and preventing gas bubble entrapment
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 solution significantly reduces gas bubble formation and accumulation, maintaining high ion conductivity and preventing hot spots, thus enhancing the efficiency and reliability of the electrolysis process.
Implementation Method 1
forming a three-dimensional porous network that extends into the support
Implementation Method 2
the separator should also be a highly ionic conductor for transportation of hydroxyl ions from the cathode to the anode
Implementation Method 3
prevent the recombination of hydrogen (formed at the cathode) and oxygen (formed at the anode) by avoiding gas crossover
Implementation Method 4
a dope solution containing a polymer resin and hydrophilic inorganic particles, which forms a three-dimensional porous network
Data Source
AI summary
A separator for alkaline electrolysis (1) comprising a porous support (100) and a porous layer (200) provided on the porous support, characterized in that a lateral Bubble Point of the separator, measured according to the method described in the description, is at least 0.2 bar.