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First-Principles Algorithm for Air Quality Electrochemical Gas Sensors.

¹Lancaster Environment Centre, Lancaster University, Library Avenue, Lancaster LA1 4YQ, United Kingdom.

|September 9, 2020

Summary

This study introduces a simple method for accurately measuring air pollutant concentrations using electrochemical sensors. By employing an auxiliary sensor with a Nafion membrane, humidity-induced signal drifts are corrected, improving data reliability for air quality monitoring.

Keywords:

air quality algorithm electrochemical sensor relative humidity temperature

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Area of Science:

Environmental Science
Analytical Chemistry
Sensor Technology

Background:

Electrochemical sensors are crucial for air quality monitoring, but their accuracy can be compromised by environmental factors like humidity.
Existing methods for correcting sensor drift are often complex or time-consuming.

Purpose of the Study:

To develop a simple, rapid, and physically clear method for mapping raw voltage readings to concentrations for parts-per-billion (ppb) level air quality electrochemical sensors.
To improve the accuracy and reliability of electrochemical sensor data by compensating for humidity-induced signal drift.

Main Methods:

Introduction of an auxiliary sensor coated with a Nafion membrane to specifically capture humidity-induced signals.
Utilizing the auxiliary sensor's signal to correct drift in the main sensor, which detects both the target gas and ambient water vapor.
Validation of the method by comparing sensor data with reference instruments.

Main Results:

The developed approach enables rapid and accurate mapping of voltage readings to ppb-level concentrations.
The Nafion-coated auxiliary sensor effectively isolates and quantifies humidity effects.
Corrected sensor data showed favorable comparison with reference instruments, demonstrating improved accuracy.

Conclusions:

The presented double-sensor approach offers a robust and user-friendly solution for enhancing electrochemical air quality sensor performance.
The method is based on first principles, ensuring physical clarity and ease of implementation for routine users.
A potential single-sensor design incorporating a Nafion-coated electrode is proposed for further miniaturization and integration.