Two-dimensional(2D)heterostructures hold great promise in designing integrated materials,while the current synthesis strategies still confront challenges for multilayer heterostructure construction and scale-up produc...Two-dimensional(2D)heterostructures hold great promise in designing integrated materials,while the current synthesis strategies still confront challenges for multilayer heterostructure construction and scale-up production.Here we report a generalized host-vip strategy based on nonexfoliated layered graphene oxide(LGO)to construct graphene-based heterostructures that consist of multilayered,alternately aligned graphene and metal oxide nanosheets.The 2D-aligned GOs and open interlayer spaces make LGO an ideal platform to create periodic 2D host frameworks.Polyetheramine oligomers covalently bond the adjacent GOs.The extended chain conformation endows the resulting accordionlike GO frameworks with high structural stability,periodicity and enlarged interlayer space.Owing to the high affinity of the open and well-arranged 2D channels toward vip precursors,a variety of high-quality heterostructures can be synthesized.Furthermore,a variety of exfoliated,ultrathin metal oxide nanosheets can also be prepared by removing the graphene skeleton.The flexible interlayer chemistry presented in this study paves a way toward the synthesis of a large family of graphene-inorganic/organic 2D heterostructures.展开更多
Metal sulfides as a feasible candidate with high specific capacitance for supercapacitors suffer from sluggish ion/electron transport kinetics and rapid capacitance fading. Herein, we demonstrate a method to fabricate...Metal sulfides as a feasible candidate with high specific capacitance for supercapacitors suffer from sluggish ion/electron transport kinetics and rapid capacitance fading. Herein, we demonstrate a method to fabricate a composite of reduced graphene oxide（rGO） with hollow Co9S8 derived from metal organic framework（MOF）. Due to the combined highly conductive rGO substrates and hollow shell, the prepared r GO/Co9S8 composite exhibits a high specific capacitance of 575.9 F/g at 2 A/g and 92.0% capacitance retention after 9000 cycles. Its excellent electrochemical performance provides great promise for application, and this versatile method can be extended to prepare other similar nanocomposite.展开更多
基金This work was supported by Shanghai International Collaboration Research Project(19520713900).
文摘Two-dimensional(2D)heterostructures hold great promise in designing integrated materials,while the current synthesis strategies still confront challenges for multilayer heterostructure construction and scale-up production.Here we report a generalized host-vip strategy based on nonexfoliated layered graphene oxide(LGO)to construct graphene-based heterostructures that consist of multilayered,alternately aligned graphene and metal oxide nanosheets.The 2D-aligned GOs and open interlayer spaces make LGO an ideal platform to create periodic 2D host frameworks.Polyetheramine oligomers covalently bond the adjacent GOs.The extended chain conformation endows the resulting accordionlike GO frameworks with high structural stability,periodicity and enlarged interlayer space.Owing to the high affinity of the open and well-arranged 2D channels toward vip precursors,a variety of high-quality heterostructures can be synthesized.Furthermore,a variety of exfoliated,ultrathin metal oxide nanosheets can also be prepared by removing the graphene skeleton.The flexible interlayer chemistry presented in this study paves a way toward the synthesis of a large family of graphene-inorganic/organic 2D heterostructures.
基金Financial support from National Key Project (No. 2017YFF0210703)Distinguished Young Scientists Program of the National Natural Science Foundation of China (Nos. 51425301, 21374021, 51673096 and U1601214)
文摘Metal sulfides as a feasible candidate with high specific capacitance for supercapacitors suffer from sluggish ion/electron transport kinetics and rapid capacitance fading. Herein, we demonstrate a method to fabricate a composite of reduced graphene oxide（rGO） with hollow Co9S8 derived from metal organic framework（MOF）. Due to the combined highly conductive rGO substrates and hollow shell, the prepared r GO/Co9S8 composite exhibits a high specific capacitance of 575.9 F/g at 2 A/g and 92.0% capacitance retention after 9000 cycles. Its excellent electrochemical performance provides great promise for application, and this versatile method can be extended to prepare other similar nanocomposite.
