Conductive Diamond Ozone Generator Membrane Segmentation
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Solution Overview
Problem
Conventional ozone generators using conductive diamond electrodes with fluororesin type cation exchange membranes face high membrane consumption and short operational safety due to hydrogen gas permeation, limiting ozone generation efficiency and stability over time.
Innovation Solution
The ozone generator design incorporates a conductive diamond electrode with a substrate having a convexo-concave surface and a notch-less fluororesin type cation exchange membrane, along with a close-packed layer of ion exchange resin particles, to suppress membrane consumption and maintain stable ozone production by controlling hydrogen concentration and cell voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fluororesin type cation exchange membrane is used in an electrolytic ozone generator with a conductive diamond electrode, then high current efficiency in ozone generation is achieved, but the membrane is consumed rapidly due to oxidation by the conductive diamond electrode, leading to short operational life and safety issues
Solution Approach 1:
The membrane system is segmented into multiple layers: a first fluororesin type cation exchange membrane layer closely adhering to the conductive diamond electrode, and a second porous layer made of ion exchange resin particles or porous fluororesin particles. This segmentation allows the first layer to handle the harsh electrochemical environment near the electrode while the second layer provides structural support and reduced consumption, thereby extending operational life while maintaining high ozone generation efficiency.
Solution Approach 2:
The invention uses a composite membrane structure combining fluororesin type cation exchange membrane with ion exchange resin particles or porous fluororesin particles. This composite structure leverages the chemical stability and ion conductivity of fluororesin near the electrode while using the porous structure and mechanical strength of the particle-based second layer to reduce overall membrane consumption and extend operational life.
2Duration of action of stationary object
If a thick fluororesin type cation exchange membrane is used to reduce consumption, then membrane life is extended, but hydrogen gas from the cathode can permeate through to the anode side, creating explosion hazards
Solution Approach 1:
The second layer is constructed from ion exchange resin particles or porous fluororesin particles with controlled porosity (30-70%). This porous structure provides mechanical strength and maintains ion conductivity while being sufficiently thick to prevent hydrogen gas permeation from the cathode to the anode side, thereby extending membrane life without creating explosion hazards.
3Object-affected harmful factors
If the membrane is made thinner to prevent hydrogen permeation, then safety is improved, but membrane consumption increases rapidly, reducing operational life
Solution Approach 1:
The membrane is segmented into a thin first layer (5-50 μm) of fluororesin type cation exchange membrane that prevents hydrogen permeation and closely adheres to the electrode, and a thicker second layer (50-500 μm) made of ion exchange resin particles or porous fluororesin particles that provides structural support and reduces overall consumption, thereby achieving both safety and extended operational life.
4Stability of the object's composition
If conventional lead dioxide electrodes are used, then good long-term stability is achieved, but the electrodes are susceptible to reduction and deterioration in reducing environments, requiring protective current mechanisms
Solution Approach 1:
The invention replaces conventional lead dioxide electrodes with conductive diamond electrodes that are inherently stable in reducing environments. Although diamond electrodes have high oxidation capacity that accelerates membrane consumption, they eliminate the need for protective current mechanisms during suspension, simplifying the overall system while maintaining long-term operational stability.
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 enables stable ozone generation for an extended period with reduced fluororesin type cation exchange membrane consumption, maintaining high current efficiency and operational safety, thus overcoming the limitations of previous designs.
Implementation Method 1
water is electrolyzed to evolve ozone from the anode and hydrogen from the cathode
Implementation Method 2
a notch-less fluororesin type cation exchange membrane is closely adhered to the surface of the cathode
Data Source
AI summary
The present invention provides an ozone generator comprising an anode and a cathode provided on each side of a fluororesin type cation exchange membrane, the anode being a conductive diamond electrode having conductive diamond on the surface, wherein water is supplied to an anode compartment, DC current is supplied between the anode and the cathode to electrolyze water to evolve ozone from the anode compartment and hydrogen from a cathode compartment, the conductive diamond electrode comprising a substrate having a plurality of convexo-concave and a conductive diamond film coated on the surface of the substrate is applied as the conductive diamond electrode, and a close packed layer of ion exchange resin particles or the fluororesin type cation exchange membrane with notch is closely adhered to the surface of the anode side of the fluororesin type cation exchange membrane.