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Nitrogen-Doped Indium Oxide Electrochemical Sensor for Stable and Selective NO2 Detection.
Xichao Mo1, Chonghui Zhu1, Zhaorui Zhang1
1School of Environmental Science and Technology, Dalian University of Technology, No. 2 Linggong Road, Ganjingzi District, Dalian, 116024, China.
Advanced Materials (Deerfield Beach, Fla.)
|August 20, 2024
Summary
A new nitrogen-doped indium oxide sensor offers a cost-effective alternative for detecting nitrogen dioxide (NO2). This novel electrochemical sensor demonstrates high stability and rapid response times at room temperature, outperforming precious metal catalysts.
Area of Science:
- Materials Science
- Electrochemistry
- Environmental Science
Background:
- Metal oxide semiconductor (MOS) sensors lack selectivity and require high temperatures.
- Electrochemical sensors offer selectivity but are expensive and unstable due to precious metal catalysts (e.g., Pt/C).
Purpose of the Study:
- To develop a novel, cost-effective electrochemical sensor for gas detection.
- To synthesize and optimize nitrogen-doped indium oxide (In2O3-xNx/3Vx/3) for enhanced gas sensing performance.
Main Methods:
- Synthesis of nitrogen-doped indium oxide with varying nitriding times.
- Optimization of the In2O3-xNx/3Vx/3 composition (0.01≤x≤0.14).
- Performance evaluation of the optimized sensor for nitrogen dioxide (NO2) detection.
Main Results:
- The optimized In2O3 N-40 min sensor showed a 771 nA response to 10 ppm NO2 at ambient temperature.
- Achieved rapid response (5 s) and recovery (16 s) times, significantly faster than Pt/C sensors.
- Demonstrated excellent long-term stability (over 30 days) with 98% performance retention, outperforming Pt/C (68% retention).
Conclusions:
- The novel nitrogen-doped indium oxide sensor is a cost-effective and high-performance alternative to traditional gas sensors.
- Eliminates the need for expensive and unstable precious metal catalysts.
- Offers a promising solution for environmental monitoring and industrial safety applications.
