We reported a facile and robust one-pot wet chemistry strategy to achieve the growth of uniform three dimensional（3D） MoSe_2 ultrathin nanostructures on graphene nanosheets to form high quality MoSe_2/rGO hybrid nan...We reported a facile and robust one-pot wet chemistry strategy to achieve the growth of uniform three dimensional（3D） MoSe_2 ultrathin nanostructures on graphene nanosheets to form high quality MoSe_2/rGO hybrid nanostructures.Owing to the graphene as a support,it can significantly prevent the aggregation of MoSe_2 and the distribution of MoSe_2 on graphene was highly uniform.Importantly,due to the unique structures,the as-harvested MoSe_2/rGO hybrid exhibited excellent electrochemical performance as anode materials for sodium-ion battery（SIB）.When evaluated in a half cell system,the MoSe_2/rGO hybrid nanostructures could deliver a capacity of 200.2 mA h g^（-1） at8 A g^（-1） and maintain a capacity of 230.1 mA h g^（-1） over 100 cycles at 5 A g^（-1）.When coupled with Na_3V_2（PO_4）_3 cathode in a full cell system,the material could deliver a discharge capacity of 363.1 mA h g^（-1） at the current density of 0.5 A g^（-1）.Moreover,a discharge capacity of 56.4 mA h g^（-1） could be achieved even at a high current density of 10 A g^（-1）,which clearly suggested the high power capability of MoSe_2/rGO hybrid nanostructures for sodium ion energy storage.展开更多
The lithium polysulfide shuttle and sluggish sulfur reaction kinetics still pose significant challenges to lithium-sulfur(Li-S)batteries.The functional plane of Fe-MoSe_(2)@r GO nanohybrid with abundant defects has be...The lithium polysulfide shuttle and sluggish sulfur reaction kinetics still pose significant challenges to lithium-sulfur(Li-S)batteries.The functional plane of Fe-MoSe_(2)@r GO nanohybrid with abundant defects has been designed and applied in Li-S batteries to develop the functional separator and multi-layer sulfur cathode.The cell with a functional separator exhibits a retention capacity of 462 m Ah g^(-1)after the 1000th at 0.5 C and 516 m Ah g^(-1)after the 600th at 0.3 C.Even at low electrolyte conditions(7.0μL_(mgsulfur)^(-1)and 15μL_(mgsulfur)^(-1))under high sulfur loadings(3.46 mg cm^(-2)and 3.73 mg cm^(-2)),the cell still presents high reversible discharge capacities 679 and 762 m Ah g^(-1)after 70 cycles,respectively.Further,at sulfur loadings up to 8.26 and 5.2 mg cm^(-2),the cells assembled with the bi-layers sulfur cathode and the tri-layers sulfur cathode give reversible capacities of 3.3 m Ah cm^(-2)after the 100th cycle and 3.0 m Ah cm^(-2)after the 120th cycle,respectively.This research not only demonstrates that the FeMoSe_(2)@r GO functional plane is successfully designed and applied in Li-S batteries with superior electrochemical performances but also paves the novel way for developing a unique multi-layer cathode technique to enhance and advance the electrochemical behavior of Li-S cells at a high-sulfur-loading cathode under lean electrolyte/sulfur(E/S)ratio.展开更多
基金supported by the start-up funding from Xi'an Jiaotong University,the Fundamental Research Funds for the Central Universities(2015qngzl2)the China National Funds for Excellent Young Scientists(21522106)the National Natural Science Foundation of China(21371140)
文摘We reported a facile and robust one-pot wet chemistry strategy to achieve the growth of uniform three dimensional（3D） MoSe_2 ultrathin nanostructures on graphene nanosheets to form high quality MoSe_2/rGO hybrid nanostructures.Owing to the graphene as a support,it can significantly prevent the aggregation of MoSe_2 and the distribution of MoSe_2 on graphene was highly uniform.Importantly,due to the unique structures,the as-harvested MoSe_2/rGO hybrid exhibited excellent electrochemical performance as anode materials for sodium-ion battery（SIB）.When evaluated in a half cell system,the MoSe_2/rGO hybrid nanostructures could deliver a capacity of 200.2 mA h g^（-1） at8 A g^（-1） and maintain a capacity of 230.1 mA h g^（-1） over 100 cycles at 5 A g^（-1）.When coupled with Na_3V_2（PO_4）_3 cathode in a full cell system,the material could deliver a discharge capacity of 363.1 mA h g^（-1） at the current density of 0.5 A g^（-1）.Moreover,a discharge capacity of 56.4 mA h g^（-1） could be achieved even at a high current density of 10 A g^（-1）,which clearly suggested the high power capability of MoSe_2/rGO hybrid nanostructures for sodium ion energy storage.
基金the support from the National Natural Science Foundation of China(No.21373189)the Science and Technology Department of Henan Province(No.212102210586)the Top-Notch Talents Program of Henan Agricultural University(No.30501035)。
文摘The lithium polysulfide shuttle and sluggish sulfur reaction kinetics still pose significant challenges to lithium-sulfur(Li-S)batteries.The functional plane of Fe-MoSe_(2)@r GO nanohybrid with abundant defects has been designed and applied in Li-S batteries to develop the functional separator and multi-layer sulfur cathode.The cell with a functional separator exhibits a retention capacity of 462 m Ah g^(-1)after the 1000th at 0.5 C and 516 m Ah g^(-1)after the 600th at 0.3 C.Even at low electrolyte conditions(7.0μL_(mgsulfur)^(-1)and 15μL_(mgsulfur)^(-1))under high sulfur loadings(3.46 mg cm^(-2)and 3.73 mg cm^(-2)),the cell still presents high reversible discharge capacities 679 and 762 m Ah g^(-1)after 70 cycles,respectively.Further,at sulfur loadings up to 8.26 and 5.2 mg cm^(-2),the cells assembled with the bi-layers sulfur cathode and the tri-layers sulfur cathode give reversible capacities of 3.3 m Ah cm^(-2)after the 100th cycle and 3.0 m Ah cm^(-2)after the 120th cycle,respectively.This research not only demonstrates that the FeMoSe_(2)@r GO functional plane is successfully designed and applied in Li-S batteries with superior electrochemical performances but also paves the novel way for developing a unique multi-layer cathode technique to enhance and advance the electrochemical behavior of Li-S cells at a high-sulfur-loading cathode under lean electrolyte/sulfur(E/S)ratio.
