Porous Anode for Ion Exchange Membrane Electrolyzer
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Solution Overview
Problem
Current ion exchange membrane electrolyzers require high electrolysis voltages and produce high concentrations of impurity gases, particularly oxygen, during the electrolysis of alkali metal chloride solutions, which increases energy consumption and environmental impact.
Innovation Solution
The development of an anode with a reduced thickness (0.1-0.5 mm) and optimized perforation dimensions (SW/LW ratio of 0.45-0.55) or woven mesh with wire diameters not exceeding 0.20 mm and a d/D ratio of 0.40-0.55, which reduces the retention time of hydroxide ions and decreases oxygen gas production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional anode thickness is used, then structural strength is maintained, but electrolysis voltage remains high and energy consumption increases
Solution Approach 1:
The anode employs a porous metal plate structure with controlled porosity (30-70%) and specific pore size (10-100 μm). This porous configuration reduces the effective thickness and electrical resistance of the anode, enabling electrolysis at lower voltages while maintaining sufficient structural strength through the three-dimensional framework of the porous material.
Solution Approach 2:
The anode utilizes composite material construction by combining metal base material with porous structure, and optionally coating it with catalyst layers (such as ruthenium oxide, iridium oxide, or mixed metal oxides). This composite approach optimizes both mechanical strength and electrochemical performance, allowing thin-section anodes to achieve low electrolysis voltage without sacrificing durability.
2Use of energy by moving object
If anode thickness is reduced to lower electrolysis voltage, then energy consumption decreases, but the retention time of hydroxide ions increases leading to higher impurity gas concentration
Solution Approach 1:
The porous structure with optimized pore size (10-100 μm) and porosity (30-70%) creates enhanced mass transfer characteristics. Hydroxide ions diffusing through the ion exchange membrane are rapidly transported through the porous anode structure, reducing their retention time and minimizing oxygen gas generation from side reactions, thus lowering impurity gas concentration in the chlorine product.
Solution Approach 2:
The anode design implements local quality optimization by creating different functional zones within the porous structure. The surface layer near the ion exchange membrane interface is designed with specific pore characteristics to maximize hydroxide ion removal, while the bulk structure maintains mechanical strength. This spatial differentiation allows thin-section anodes to effectively reduce impurity gas without compromising overall performance.
3Use of energy by moving object
If conventional anode configuration is used, then manufacturing experience is available, but the opening ratio and perforation dimensions are not optimized for low-voltage electrolysis
Solution Approach 1:
The invention systematically optimizes key parameters including anode thickness (0.1-1.0 mm), porosity (30-70%), pore size (10-100 μm), and catalyst layer properties. These parameter changes are designed to work together to achieve low electrolysis voltage. The standardized parameter ranges facilitate manufacturing while delivering superior electrochemical performance compared to conventional anodes.
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 allows for electrolysis at lower voltages and reduces the concentration of impurity gases in the anode gas, enhancing energy efficiency and environmental sustainability.
Implementation Method 1
the retention time of hydroxide ions (OH−) on the surface of an anode, which ions have diffused from a cathode chamber through an ion exchange membrane
Implementation Method 2
enables an aqueous solution of an alkali metal chloride to be electrolyzed at a lower voltage than a conventional anode
Data Source
AI summary
Provided are an anode for an ion exchange membrane electrolyzer which enables an aqueous solution of an alkali metal chloride to be electrolyzed at a lower voltage than a conventional anode and allows the concentration of an impurity gas included in an anode gas to be reduced and an ion exchange membrane electrolyzer using the same. The anode is an anode for an ion exchange membrane electrolyzer to be used in an ion exchange membrane electrolyzer that is separated by an ion exchange membrane into an anode chamber and a cathode chamber. The anode for an ion exchange membrane electrolyzer comprises at least one perforated flat metal plate 1 (expanded metal 1) and the thickness of the perforated flat metal plate 1 (expanded metal 1) ranges from 0.1 to 0.5 mm and the ratio of the short way SW to the long way LW (SW/LW) ranges from 0.45 to 0.55. The short way SW is preferably not more than 3.0 mm.