摘要
Engineering the local three-dimensional structure of metal sites has an important effect of maximizing the activity and selectivity of single-atom site catalysts.Here,we engineered a strain-assisted single Pt sites structure on a highly curved MoS_(2)surface to enhance its H_(2)S sensor property.By introducing N-methyl-2-pyrrolidone(NMP)as guiding molecules,a multilayer MoS_(2)structure with bending base planes was achieved.This bending behavior could inject not only uniform in-plane strain into the original inert MoS_(2)basal plane but also introduce sufficient accessible sites to anchor Pt monomers.Further experimental and theoretical results showed that the highcurvature MoS_(2)surface endowed 0.8%stretch strain onto the low-coordinated single Pt sites with a unique“tip”effect,which led to more accumulation of electrons around the Pt species,thereby accelerating the electric transfer process between H_(2)S and supports.The final catalyst delivered pronouncedly enhanced H_(2)S sensing response and response speed at room temperature.Our proposed strain-assisted strategy might create a new path to design highly active single-atom site catalysts for gas sensors.
基金
This work was supported by the China Ministry of Science and Technology(grant no.2020YFA0710200)
National Key R&D Program of China 2017YFA(grant nos.0208300 and 0700104)
the National Natural Science Foundation of China(grant no.21671180)
the Dalian National Laboratory for Clean Energy(DNL)Cooperation Fund,CAS(grant no.DNL201918)
the Fundamental Research Funds for the Central Universities(grant nos.WK2060120004,WK2060000021,WK2060000025,and KY2060000180).
