科研之友
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摘要
In this study, the hydrogen response of Pt-coated WO3 center dot H2O nanoplates before and after annealing is investigated and the interaction mechanism is revealed using in situ Raman spectroscopy and quasi in situ x-ray photoelectron emission spectroscopy. We find that structural water molecules form in the nanoplate during its interaction with hydrogen. However, the generation of oxygen vacancy is not observed. Generation of in-plane compressive stress is evidenced, which suggests that the valence states change of W atoms during the interaction is related to the structural displacement due to the formation of structural water. The enhancement of gas response performance after annealing is due to the transition from orthorhombic to monoclinic phase, which causes the reduction of formation energy of lattice O-H bonding and increase of reactive sites in WO6 octahedron.
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单位x; 济南大学; 五邑大学; 暨南大学; 武夷学院
