Voltammetric pH Sensor with Ionic Liquid Reference Electrode
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Solution Overview
Problem
Traditional glass pH probes are unstable, require tedious calibration, are fragile, and limited in application, making them unsuitable for food and beverage industries and harsh environments, while existing voltammetry-based systems are costly and difficult to use.
Innovation Solution
Development of voltammetric sensors with novel redox-active working electrodes, reference electrodes, and counter electrodes in flexible or user-configurable form factors, including a hand-held pH meter with interchangeable cartridges and a user-friendly interface, utilizing a modified reference electrode with a room temperature ionic liquid and carbon allotrope, enabling precise measurements over extended lifetimes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional glass pH probes are used, then pH measurement capability is achieved, but the probes are fragile and require tedious calibration
Solution Approach 1:
The patent changes the fundamental measurement parameter from potentiometric (glass electrode potential) to voltammetric (current response). This involves using a three-electrode system with working, reference, and counter electrodes, where the working electrode material and potential are dynamically adjusted to achieve both robustness and simplified operation without calibration
Solution Approach 2:
The patent replaces the mechanical glass membrane structure with an electrochemical system based on redox reactions at electrode surfaces. This substitution eliminates the fragile glass component while maintaining pH sensing capability through electrochemical measurements, achieving both durability and ease of use
2Reliability
If traditional glass pH probes are used, then pH measurement is possible, but they require careful maintenance and storage
Solution Approach 1:
The voltammetric system with its three-electrode configuration and automated measurement protocol eliminates the need for manual calibration and maintenance. The system self-regulates through electrochemical principles, with the reference electrode providing stable potential and the counter electrode handling current flow, freeing the working electrode to focus solely on pH-sensitive measurements without requiring user intervention for maintenance
3Adaptability or versatility
If voltammetry-based analyte sensing systems are used, then replacement for glass probe is achieved, but the systems are costly and difficult to use
Solution Approach 1:
The patent divides the voltammetric system into distinct functional components: a working electrode for pH-sensitive measurements, a reference electrode for stable potential, and a counter electrode for current flow. This segmentation allows each component to be optimized independently and simplifies the overall system operation, making it more user-friendly while maintaining versatility across applications
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
The solution provides stable, precise pH measurements that can be performed by unskilled workers in various conditions, with flexible form factors and reduced maintenance needs, overcoming the limitations of traditional glass probes.
Implementation Method 1
voltammetric sensors comprising novel redox-active working electrodes, reference electrodes, and counter electrodes
Implementation Method 2
modified reference electrode with a room temperature ionic liquid and carbon allotrope
Data Source
AI summary
Analyte sensing devices suitable for measuring pH or other analytes are provided in a variety of form factors, including a hand-held device.