Electrospinning of Pd–In₂O₃ Nanofibers for High-Performance Room Temperature Hydrogen Sensors

Abstract

Pure In2O3 nanofibers (NFs) were first prepared by electrospinning, and then Pd–In2O3 NFs were obtained by Pd modification and further used for room temperature hydrogen (H2) sensing. The chemical composition, morphology, and structure of the obtained samples were systematically investigated. The sensing performance of sensors was tested under different H2 concentrations at room temperature. The Pd@In2O3 NF sensor with a Pd loading of 1.5 wt% reflected excellent selectivity, high response (Ra/Rg = 293.6), short response time (12 s), and recovery time (23 s) for 10,000 ppm H2 at room temperature, which is due to not only the catalytic property and chemical sensitization of Pd but also the high specific surface area from the porous structure. The outstanding sensing performance indicated that the Pd@In2O3 nanocomposites have broad prospects for applications for detecting low concentration H2 at room temperature.