Abstract
The high and ultrafast response of hydrogen gas sensors is very critical during H2 transportation and storage. For detecting the ultra-low ppm level H2, a new Pt functionalized Fe2(MoO4)3 (FMO) nanoflower gas sensor (Pt/Fe2(MoO4)3 briefed as Pt/FMO) was fabricated in this work by a simple solvothermal method and calcination process. The Pt/FMO gas sensor shows excellent H2 sensing performances, which can be attributed to the high catalytic activity of Pt and the large surface area of 3D FMO. The optimal operating temperature of Pt/FMO was investigated and determined at 300 °C. The response/recovery time of Pt/FMO was only 16/38 s, which displayed excellent stability and ultrafast response/recovery time toward ultra-low ppm level H2 (10 ppm) at 300 °C, respectively. The enhancement mechanism was also studied and discussed. This newly developed gas sensor may have great application potential in the rapid detection of low-concentration hydrogen gas.
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