Conductive Diamond Electrode for Ozone Water Measurement
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Solution Overview
Problem
Conventional ozone water concentration measurement methods, such as iodine/pigment titration and ultraviolet absorption, face challenges including reliance on visual determination, high costs, complex operations, and issues with electrolyte handling and corrosion, while diaphragm-type polarography struggles with precise measurement due to ozone bubbles and electrolyte maintenance.
Innovation Solution
An ozone water concentration measurement apparatus using an electrically conductive diamond working electrode with a small surface area contact (628 μm2 to 392500 μm2) to measure ozone concentration without an electrolyte, allowing precise electric current measurement and eliminating voltage drop issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a large working electrode (4mm to 5mm outer diameter) is used in electrochemical ozone measurement, then the electrode can be directly dipped in ozone water without diaphragm, but the solution resistance becomes too large causing excessive voltage drop and inaccurate current measurement
Solution Approach 1:
The patent changes the critical parameter of electrode surface area from large (4-5mm diameter) to extremely small (628-392500 μm²). This parameter change reduces the solution resistance and voltage drop to negligible levels, enabling accurate current measurement while maintaining the simplicity of direct dipping operation without diaphragm or electrolyte
Solution Approach 2:
The patent transitions from macro-scale electrode (millimeter dimension) to micro-scale electrode (micrometer dimension). This dimensional change fundamentally alters the electrical characteristics, reducing the electrode area to a point-contact level that minimizes solution resistance and enables precise measurement
2Measurement precision
If electrolyte is added to reduce solution resistance, then voltage drop decreases and current measurement improves, but liquid waste disposal and handling difficulties arise
Solution Approach 1:
The patent extracts and eliminates the electrolyte component from the measurement system. By using an extremely small electrode area, the system achieves sufficient measurement precision without requiring electrolyte to reduce solution resistance, thereby removing the harmful waste disposal issue entirely
Solution Approach 2:
The patent employs a disposable, maintenance-free microelectrode that eliminates the need for electrolyte replacement and waste disposal. The electrode itself is the consumable element that requires no further handling after the measurement, replacing the problematic electrolyte system
3Reliability
If diaphragm-type polarography is used to avoid electrolyte corrosion, then electrode corrosion is prevented, but precise measurement is difficult due to ozone bubbles scattering light
Solution Approach 1:
The patent replaces the optical measurement system (ultraviolet absorption) with an electrochemical measurement system using a microelectrode. This substitution eliminates the light scattering problem caused by ozone bubbles while maintaining reliability through direct electrochemical detection at the electrode surface
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
Enables high-accuracy ozone concentration measurement without electrolytes, reducing waste disposal concerns and operational complexities, while maintaining precise voltage application and current measurement.
Implementation Method 1
an ozone water concentration measurement apparatus and an ozone water concentration measurement method using an electrochemical method
Implementation Method 2
the large surface area of contact with the sample solution greatly increases the solution resistance Rsol and the current I, and the resultant voltage drop becomes too large to ignore
Data Source
AI summary
An ozone water concentration measurement apparatus that is capable of measuring ozone concentrations with high accuracy and without using an electrolyte brings at least a counter electrode and a working electrode into contact with ozone water, which is a sample solution (S), applies voltage between the counter electrode and the working electrode, and measures the current value at that voltage, to thereby calculate the ozone concentration in the ozone water. In the ozone water concentration measurement apparatus, the working electrode is a conductive diamond electrode, and the surface area that contacts the ozone water of the working electrode is within the range of 628 to 392,500 μm2.