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Gas sensors based on Pd-decorated and Sb-doped SnO2 for hydrogen detection
Xingtai Chen,Tao Liu,Ran Wu,Jingkun Yu,Xitao Yin 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.115 No.-
Pd-modified Sb-doped SnO2 nanomaterials were prepared by a simple hydrothermal reaction and reductionmethod. The as-obtained samples were characterized by X-ray diffraction, scanning electron microscopy,X-ray phosphorescence, and elemental mapping analysis. The extracted results demonstrated evendoping of Sb within the SnO2 lattice, and Pd was successfully incorporated on the surface of samples. Compared with the pristine SnO2, 3 mol% Sb doping with 7 wt% Pd decorating exhibited the highestresponse of 9.7 to 100 ppm H2 at 320 C and revealed excellent selectivity and cycling stability to hydrogen. The mechanism of the enhanced sensing performance of Pd@Sb-SnO2 can be attributed to the changein the energy band structure by Sb doping, the energy-band bending, and depletion layer generated withthe Pd loading. The increased oxygen vacancy caused by the lattice distortion generated by the Sb doping,and the strong metal-support interaction effect between the Pd and SnO2 also plays an important role.