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Catalytic Activation Function of Noble-Metal-Free High-Entropy Alloy for Enhancing SnO2 Acetone Detection Capability
Ou Wang1, Zhiheng Ma1,2, Zhenggang Xue1
1NEST Lab, Department of Chemistry, College of Sciences, Shanghai University, Shanghai 200444, PR China.
ACS Nano
|March 27, 2025
Summary
A novel non-noble metal alloy enhances tin dioxide for efficient acetone detection. This development offers a sustainable alternative for high-performance gas sensors, improving sensitivity and stability.
Area of Science:
- Materials Science
- Chemical Engineering
- Sensor Technology
Background:
- Noble metals are commonly used to enhance gas sensor performance but are costly and scarce.
- Developing sustainable alternatives for high-performance gas sensors is crucial.
Purpose of the Study:
- To design and evaluate a non-noble metal high-entropy alloy (HEA) as a sensitizer for SnO2.
- To improve the sensitivity, selectivity, and stability of SnO2-based acetone sensors.
Main Methods:
- Synthesized MnFeCoNiCu HEA nanoparticles.
- Loaded HEA onto SnO2 to create a composite material.
- Tested the gas-sensing performance of the composite for acetone detection.
Main Results:
- The HEA-loaded SnO2 exhibited high sensitivity (Ra/Rg = 4.17 at 0.5 ppm) and selectivity for acetone.
- Achieved a low detection limit (30 ppb), fast response/recovery times (4.6 s/5 s), and excellent long-term stability (>50 days).
- Demonstrated stable performance under high humidity (90% RH).
Conclusions:
- The MnFeCoNiCu HEA effectively enhances SnO2 for acetone sensing through electronic sensitization.
- The HEA's unique electronic properties increase active oxygen species and catalytic sites.
- This study presents a promising, cost-effective approach for developing advanced gas sensors.
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