Self-Powered Potentiometric Sensor Transduction to a Capacitive Electronic Component for Later Readout

Area of Science:

• Electrochemistry
• Sensor Technology
• Energy Harvesting

Background:

• Potentiometric sensors function as galvanic cells, generating voltage based on sample composition.
• Traditional potentiometric sensing requires external power for voltage measurement and readout.
• There is a need for self-powered, portable sensing solutions, especially for point-of-care applications.

Purpose of the Study:

• To demonstrate energy harvesting and storage within a potentiometric sensor system.
• To enable readout of ion activity from stored energy, independent of the sensor circuit.
• To validate the concept for detecting physiological ion concentrations in portable devices.

Main Methods:

• Integration of an electronic capacitor as a portable transduction component between indicator and reference electrodes.
• Harvesting and storing energy generated by the potentiometric sensor during the sensing process.
• Disconnection of the capacitor from the sensor circuit for subsequent voltage readout using a multimeter.

Main Results:

• Successfully harvested and stored energy from the potentiometric sensor without external power.
• Demonstrated that the capacitor maintains stored charge for extended periods (hours) after disconnection.
• Validated the detection of physiological potassium ion (K+) concentrations in artificial sweat samples.

Conclusions:

• A novel method for energy harvesting and storage in potentiometric sensors has been developed.
• This approach enables self-powered potentiometric detection and convenient readout using portable devices.
• The technology holds significant potential for developing low-cost, point-of-care diagnostic tools and other portable sensing applications.