Abstract
The rapid detection of hydrogen (H2) at 25 ℃ was of important. Here, A strategy was used to construct a hydroxyl-oxygen vacancy model by functionalizing palladium nanoparticles (Pd NPs) on cubic, rod and spherical CeO2, through a simple reduction process to obtain the Ce4+/Ce3+ transited and the generated of Pd. The results have shown that the 5.0 wt% Pd NPs /CeO2-C sensor exhibited sensitive H2 sensing performance (response value Ra/Rg of 1322 for 1% H2), and fast sensing speed (response time of only 3 s for 1% H2 and 2 s for 3% H2) in the air at 25 °C, the actual detection limit of the instrument is only 50 ppm. Probably due to the reduction of ascorbic acid, the chemisorbed oxygen and Ce3+ were raised by a factor of 2.95 and 1.62. The synergistic effect of the hydroxyl-oxygen vacancy model and Pd presents a new idea for the detection of hydrogen at 25 ℃.
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