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High-Entropy Engineering and External Magnetic Field Modulation Synergistically Enhance the H2S Sensing Performance
Yunfei Wang1, Min Zhang1, Rui Li1
1School of Physics Science and Technology, Xinjiang University, Urumqi, China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|August 5, 2026
Summary
This study introduces a novel high-entropy perovskite oxide for highly sensitive hydrogen sulfide (H₂S) detection. The material demonstrates a significantly enhanced response and recovery speed, crucial for industrial safety and environmental monitoring.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Engineering
Background:
- High-performance gas sensors are essential for detecting low concentrations of hydrogen sulfide (H₂S), vital for environmental safety and industrial applications.
- Conventional rare-earth ferrites exhibit slow response times at low H₂S levels due to thermodynamic and kinetic limitations.
- High surface reaction barriers in existing materials hinder efficient gas detection.
Purpose of the Study:
- To design and synthesize a novel high-entropy perovskite oxide for enhanced H₂S detection.
- To investigate the synergistic effects of high entropy and magnetic field modulation on sensor performance.
- To overcome the limitations of conventional rare-earth ferrites in terms of sensitivity and response kinetics.
Main Methods:
- A wet-chemical method was employed to synthesize the high-entropy perovskite oxide (Gd₀.₂Tb₀.₂Dy₀.₂Ho₀.₂Er₀.₂)FeO₃.
- The material's structure was characterized, focusing on lattice distortion and active site generation.
- The influence of an external magnetic field on electron transfer and surface redox kinetics was studied.
Main Results:
- The high-entropy composition induced significant local lattice distortion and created heterogeneous active sites.
- External magnetic field application optimized electron transfer and accelerated surface redox reactions.
- The sensor achieved a 6-fold sensitivity enhancement, an ultrafast 1.72 s recovery time, and a detection limit of 0.5 ppm for H₂S.
Conclusions:
- The synergistic effect of high-entropy structural distortion and magnetic field modulation overcomes the response-recovery trade-off in gas sensors.
- This strategy offers a promising pathway for developing next-generation intelligent sensing systems for H₂S.
- The developed material shows potential for advanced environmental monitoring and industrial safety applications.
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