Bimetallic PtPd sensitized oxygen vacancies enriching WO3 hollow microspheres for efficient triethylamine sensing

Real-time and high efficient monitoring of triethylamine (TEA) is crucial for chemical industry production and environmental safety. However, it is still challenge to achieve ppb level detection efficiently and exact understanding. In this paper, bimetallic PtPd sensitized vacancies enriching WO 3 hollow microspheres materials were designed and harvested an ultra-high response and selectivity to TEA gas. It was found that the oxygen vacancies of WO 3 hollow microspheres can be enhanced by the introduction of Fe element. Furthermore, the PtPd@Fe-WO 3 exhibited a remarkable sensing response (409.58–20 ppm TEA), which was 4.85 times higher than that of Fe-WO 3 -based sensor and 21.28 times higher than that of pure WO 3 sensor. This further enhancement of response can be attributed to the strong catalytic spillover effect and electron sensitization of Pt as well as the reversible redox cycling properties of Pd. In addition, the PtPd@Fe-WO 3 material also possesses fast response, excellent selectivity, long-term stability, and a low detection limit of 69.59 ppb, and the gas sensing mechanism was understood by density functional theory (DFT). The proposed bimetallic PtPd sensitized oxygen vacancies enriching WO 3 system is a promising candidate for building high-performance TEA sensors for practical applications.