Guan, Heng; Fan, Yizhuo; Wang, Wei; Wang, Qilin; Chen, Yu; Ruan, Shengping Source: Sensors and Actuators B: Chemical, v 407, May 15, 2024;

Abstract:

As a ternary metal oxide with a suitable band gap and double catalytic center, MnWO4 has a broad application prospect in the fields of electrochemistry, catalysis, and gas detection. In this study, MnWO4 @C composite was synthesized by a one-step hydrothermal method and its sensitivity property to xylene was investigated. The carbon microspheres with favorable ion adsorption ability effectively inhibit the agglomeration of the reaction ions, thus producing uniformly dispersed nanoscale MnWO4 particles with large specific surface area, which could expose more reaction sites for the high valence W with good redox ability as well as Mn catalytic activation center with d-orbit. The MnWO4 @C composite material possesses enhanced gas adsorption and high catalytic activity. The response of the MnWO4 @C composite (53.4, 100 ppm) is 25 times larger than that of MnWO4 to xylene, and the modified material shows properties of lower detection limit (2 ppm), good operating temperature (157 ℃) and significant selectivity to xylene. This work provides an effective strategy to improve the sensitive activity of MnWO4.

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