Related Experiment Video
Updated: Jun 19, 2025
09:21
Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether
Published on: August 17, 2019
8.9K
Oxygen Vacancy Enabled Electronic Structure Engineering of Pt-WO3 Nanosheets toward Highly Efficient BTEX Sensing
Xuan-Yu Yang1, Jian-Yong Yuan1, Li-Juan Yue1
1College of Materials and Chemical Engineering, Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, Zhengzhou University of Light Industry, Zhengzhou 450002, P. R. China.
ACS Sensors
|July 24, 2024
Summary
Tuning oxygen vacancies in platinum (Pt) decorated tungsten trioxide (WO3) nanosheets enhances benzene series (BTEX) gas sensing. This material design optimizes electronic interactions for superior performance in detecting volatile organic compounds.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Sensing
Background:
- Tungsten trioxide (WO3) and platinum (Pt) nanoparticles are key components in catalytic reactions.
- The electronic and surface structures of these materials significantly influence their performance.
- The role of oxygen vacancies in WO3 and their effect on Pt's electronic structure remain unclear, hindering advanced material design.
Purpose of the Study:
- To investigate the impact of oxygen vacancies in WO3 on the electronic structure of Pt nanoparticles.
- To explore the synergistic effects between Pt and the WO3 matrix for improved catalytic reaction performance.
- To develop advanced Pt-decorated WO3 nanosheets for enhanced benzene series (BTEX) sensing.
Main Methods:
- Preparation of Pt-decorated WO3 nanosheets with controlled oxygen vacancy structures.
- Fine-tuning of electronic metal-support interactions through annealing.
- Comprehensive structural characterization and Density Functional Theory (DFT) calculations.
Main Results:
- Pt-modified WO3 nanosheets annealed at 400 °C (Pt/WO3-400) demonstrated excellent BTEX sensing performance.
- Achieved high sensitivity (e.g., 377.33 for ethylbenzene), rapid response/recovery (10/7 s), and excellent reliability/stability.
- DFT results confirmed interfacial Ptδ+-Ov-W5+ sites as active centers, with oxygen vacancies modulating Pt's d-band structure.
Conclusions:
- Oxygen vacancies in WO3 significantly influence the d-band structure of Pt nanoparticles.
- Pt/WO3-400 exhibits enhanced surface oxygen mobility and optimal electronic metal-support interaction.
- This facilitates efficient activation and desorption of BTEX, leading to high-performance gas sensing.
