Membrane-Free Electrolysis Cell for Efficient Gas Separation
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Solution Overview
Problem
Existing electrolysis cells face limitations due to membrane-induced current flow restrictions, increased electrode separation, decreased efficiency with high current density, poor performance at high temperatures and pressures, high costs, and sensitivity to carbon monoxide poisoning, especially in proton exchange membranes.
Innovation Solution
The method involves using closely spaced, permeable electrodes made of materials like stainless steel, nickel, or palladium in a liquid alkaline electrolysis cell without a membrane, allowing for efficient production and separation of hydrogen and oxygen gases by applying a voltage across the electrodes in a potassium hydroxide or sodium hydroxide solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a membrane is used to separate hydrogen and oxygen gases, then gas separation is achieved, but current flow is restricted and electrode distance increases
Solution Approach 1:
The patent removes the membrane component entirely from the electrolysis cell design. Instead of using a membrane to separate gases, the invention relies on the physical separation of gas collection zones above each electrode and uses a wick material to manage electrolyte distribution, thereby eliminating the current flow restrictions and electrode spacing issues caused by membranes
Solution Approach 2:
The patent introduces a wick material as an intermediary component between the electrodes and gas collection spaces. This wick serves multiple functions: distributing electrolyte uniformly across the electrode surfaces, preventing gas bubbles from blocking active sites, and maintaining electrical insulation without requiring a dense membrane structure that would restrict current flow
2Reliability
If a membrane is used to separate gases, then gas separation is achieved, but the distance between electrodes increases resulting in increased resistance
Solution Approach 1:
By completely removing the membrane from the system, the patent allows electrodes to be positioned much closer together without the need for a physical barrier between them. Gas separation is achieved through separate collection chambers above each electrode rather than through a membrane, thereby minimizing electrode spacing and reducing ohmic resistance in the cell
3Productivity
If known liquid alkaline membranes are used, then electrolysis can proceed, but efficiency decreases with an increase in current density
Solution Approach 1:
The patent eliminates the membrane component that causes efficiency degradation at high current densities. Without a membrane to clog with gas bubbles or develop high resistance at elevated current densities, the cell can operate efficiently at high current densities typical of industrial electrolysis applications
Solution Approach 2:
The patent employs a wick-based hydraulic system to distribute electrolyte across the electrode surfaces. This passive capillary action ensures uniform electrolyte coverage and continuous removal of gas bubbles, maintaining high active electrode surface area and efficient current distribution even at high current densities
4Reliability
If known proton exchange membranes are used, then gas separation is achieved, but the cost increases due to requirement of noble-metal catalyst
Solution Approach 1:
The patent removes the proton exchange membrane and its associated noble metal catalyst requirements entirely. Gas separation is achieved through the physical configuration of separate gas collection chambers and wick-based electrolyte management, eliminating the need for expensive membrane materials and platinum group metal catalysts
Solution Approach 2:
The patent employs inexpensive, readily available materials such as porous wicks, standard electrode materials, and conventional electrolytes. These components can be easily replaced if needed, providing a cost-effective alternative to expensive, specialized membrane and catalyst systems
5Reliability
If known proton exchange membranes are used, then gas separation is achieved, but additional reactors are needed to reduce carbon monoxide
Solution Approach 1:
The patent eliminates the membrane system that is sensitive to carbon monoxide poisoning. By using a membrane-free design with wick-based electrolyte management, the system becomes inherently more tolerant of impurities in the feed water or electrolyte, removing the need for additional CO reduction reactors or complex purification systems
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 approach reduces the voltage required for electrolysis, enhances efficiency, and eliminates the need for costly membranes, enabling high-purity gas production at lower temperatures and pressures, while maintaining high current density and reducing operational costs.
Implementation Method 1
An electrolysis cell uses electricity to convert water to hydrogen and oxygen in gas phase
Implementation Method 2
a liquid alkaline electrolyte, namely a solution of potassium hydroxide (KOH) or sodium hydroxide (NaOH)
Data Source
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AI summary
This invention relates to electrolysis apparatus 10 adapted to produce oxygenated and hydrogenated fluid, formed during the electrolysis of an electrolytic solution passed into the apparatus 10. The apparatus 10 comprises a first and second outer end members 12 and 14 and first and second permeable electrodes 16 and 18 spaced from one another. Each permeable electrode 16 and 18 are of a foraminous or perforated material. An inlet chamber 20 has two inlets 26 for allowing electrolytic solution to pass into said chamber 20. The apparatus 10 also has an oxygen outlet 28 as well as a hydrogen outlet 30. The flow of electrolytic solution through the permeable electrodes 16 and 18 will carry with it the oxygen and hydrogen gasses generated on the positive and negative (first and second) permeable electrodes respectively.