Differential Pressure Electrolysis Membrane for High-Pressure Dry-Out
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Solution Overview
Problem
Existing differential pressure electrolysis cells face efficiency loss and membrane deterioration due to uneven water distribution and drying out of the electrolyte membrane, particularly at the electrode facing the high-pressure gas production site.
Innovation Solution
The electrolyte membrane is structured with layers having varying ion exchange capacities, with the layer facing the high-pressure electrode having a higher ion exchange capacity to maintain optimal water content and prevent drying, thereby stabilizing electrolysis efficiency and membrane integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a uniform electrolyte membrane is used in differential pressure electrolysis, then the structure is simple and manufacturing is easy, but water distribution becomes uneven and the membrane dries out at the high-pressure electrode side
Solution Approach 1:
The electrolyte membrane is designed with non-uniform ion exchange capacity distribution, where the region facing the high-pressure electrode has higher ion exchange capacity than the region facing the low-pressure electrode. This local quality variation compensates for the differential pressure effect, maintaining uniform water content across the membrane thickness and preventing drying at the high-pressure side.
2Reliability
If the ion exchange capacity is increased at the high-pressure electrode side to prevent drying, then water content uniformity is maintained, but the manufacturing process becomes more complex
Solution Approach 1:
The ion exchange capacity parameter is varied across the membrane thickness to create a gradient structure. Specifically, the ion exchange capacity is higher at the high-pressure electrode interface and lower at the low-pressure electrode interface. This parameter change approach maintains manufacturing feasibility while achieving uniform water distribution.
3Loss of energy
If differential pressure electrolysis is implemented to produce high-pressure gas, then energy efficiency is improved, but the electrolyte membrane dries out and efficiency is lost
Solution Approach 1:
The electrolyte membrane is designed with non-uniform ion exchange capacity distribution, where the region facing the high-pressure electrode has higher ion exchange capacity than the region facing the low-pressure electrode. This local quality variation compensates for the differential pressure effect, maintaining uniform water content across the membrane thickness and preventing drying at the high-pressure side.
Solution Approach 2:
The membrane structure is pre-designed with higher ion exchange capacity at the high-pressure side to counteract the drying effect that would occur during differential pressure operation. This preliminary anti-action prevents efficiency loss before it occurs by maintaining adequate water content in the membrane throughout 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
This configuration maintains consistent water content across the membrane, preventing efficiency loss and membrane deterioration, enhancing the performance of the electrolysis cell and stack.
Implementation Method 1
the electrolyte membrane includes: a first layer facing the first electrode and having a first ion exchange capacity per unit area; and a second layer facing the second electrode and having a second ion exchange capacity per unit area
Implementation Method 2
the differential pressure electrolysis cell being configured to cause a gas to be produced at the second electrode by applying a voltage between the first electrode and the second electrode for electrolyzing a fluid that contains water
Data Source
AI summary
A differential pressure electrolysis cell for producing a gas having a higher pressure than a fluid at the second electrode by applying a voltage between a first electrode and a second electrode to electrolyze the fluid containing water and supplied to the first electrode, wherein an electrolyte membrane of the differential pressure electrolysis cell includes: a first layer facing the first electrode and having a first ion exchange capacity per unit area; and a second layer facing the second electrode and having a second ion exchange capacity per unit area, and the second ion exchange capacity is larger than the first ion exchange capacity.