Ultra-small MoS_(2) quantum dots(QDs)with an average size of 2.48 nm coated on Au nanoparticles with a core-satellite structure(Au/MoS_(2) QDs)are successfully prepared by a self-assembly strategy through the strong b...Ultra-small MoS_(2) quantum dots(QDs)with an average size of 2.48 nm coated on Au nanoparticles with a core-satellite structure(Au/MoS_(2) QDs)are successfully prepared by a self-assembly strategy through the strong bonding between Au and S.Benefited from the unique structure,the Au/MoS_(2) QDs hybrid exhibits outstanding electrocatalytic performance toward hydrogen evolution reaction(HER).The Au/MoS_(2) QDs hybrid needs overpotentials of 112,146,and 206 mV to approach current densities of 10,20,and 50 mA·cm^(−2) in 0.5 mol·L^(−1) H_(2)SO_(4)(pH=0.3),respectively.And a low Tafel slope(83 mV·dec^(−1))is obtained.The catalyst also displays satisfactory stability and durability,indicating a negligible current density loss after 20 h of electrolysis.The high hydrogen generation activities and stability are attributed to the great number of active sites,high conductivity and synergistic effects between gold nanoparticles(Au NPs)and MoS_(2) QDs.Last but not least,this strategy opens up a favorable way to combine MoS_(2) QDs with other metals.展开更多
基金This work was financially supported by the National Natural Science Foundation of China(Grant No.21765016)Ningxia,leading scientific and technological innovation talents project(Grant No.KJT2018002)+1 种基金Natural Science Foundation of Ningxia(Grant No.2018AAC03012)First-rate Discipline Construction Project of Ningxia(Grant No.NXYLXK2017A04).
文摘Ultra-small MoS_(2) quantum dots(QDs)with an average size of 2.48 nm coated on Au nanoparticles with a core-satellite structure(Au/MoS_(2) QDs)are successfully prepared by a self-assembly strategy through the strong bonding between Au and S.Benefited from the unique structure,the Au/MoS_(2) QDs hybrid exhibits outstanding electrocatalytic performance toward hydrogen evolution reaction(HER).The Au/MoS_(2) QDs hybrid needs overpotentials of 112,146,and 206 mV to approach current densities of 10,20,and 50 mA·cm^(−2) in 0.5 mol·L^(−1) H_(2)SO_(4)(pH=0.3),respectively.And a low Tafel slope(83 mV·dec^(−1))is obtained.The catalyst also displays satisfactory stability and durability,indicating a negligible current density loss after 20 h of electrolysis.The high hydrogen generation activities and stability are attributed to the great number of active sites,high conductivity and synergistic effects between gold nanoparticles(Au NPs)and MoS_(2) QDs.Last but not least,this strategy opens up a favorable way to combine MoS_(2) QDs with other metals.
