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Redox-Paired Oxide/Nitride Electrodes for Humidity-Tolerant Fuel-Cell NO2 Sensing.

Xichao Mo1, Jiaxin Li1, Fengge Liu2

  • 1School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.

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|March 12, 2026
PubMed
Summary

This study introduces a novel fuel-cell-type sensor for detecting nitrogen dioxide (NO2). By pairing specific electrodes, the sensor achieves high sensitivity and stability, even in humid conditions, outperforming existing technologies.

Keywords:
fuel-cell-type gas sensorshumidity tolerancenitrogen dioxide sensingredox-paired electrodestin oxidetitanium nitride

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Environmental Sensing

Background:

  • Fuel-cell-type electrochemical gas sensors offer low-power monitoring but face challenges with humidity sensitivity and long-term stability for nitrogen dioxide (NO2) detection.
  • Existing symmetric electrode designs often compromise performance and durability.

Purpose of the Study:

  • To develop a highly sensitive, stable, and humidity-tolerant room-temperature NO2 sensor.
  • To investigate the efficacy of redox pairing in asymmetric heteroelectrodes for gas sensing applications.

Main Methods:

  • Fabrication of an asymmetric TiN/SnO2 heteroelectrode sensor using a Nafion membrane.
  • Performance evaluation including sensitivity, detection limit, response/recovery times, selectivity, and long-term stability under varying humidity.
  • Mechanistic investigation using in situ infrared spectroscopy and density functional theory (DFT).
  • Machine learning (ML)-guided screening of materials.

Main Results:

  • The asymmetric TiN/SnO2 sensor demonstrated high sensitivity (1.572 μA ppm-1), a low detection limit (18 ppb), and rapid response/recovery times (8/9 s).
  • The sensor exhibited excellent selectivity, minimal humidity-induced drift, and sustained signal retention (>98% over 180 days).
  • Performance significantly surpassed symmetric TiN-TiN, SnO2-SnO2, and previously reported fuel-cell-type NO2 sensors.
  • Mechanistic studies revealed the roles of SnO2 in water oxidation and TiN in NO2 intermediate stabilization.

Conclusions:

  • Redox pairing in asymmetric TiN/SnO2 heteroelectrodes provides a promising strategy for humidity-tolerant, stable fuel-cell-type NO2 sensing.
  • The developed sensor design overcomes key limitations of conventional gas sensors.
  • ML-guided material screening can accelerate the discovery of optimal electrode materials for advanced gas sensing.