Abstract
Hierarchically two-dimensional (2D) heteroarchitecture with ultrafine MoS2 nanosheets vertically patterned on graphene is developed by using a facile solvothermal method. It is revealed that the strong interfacial interaction between acidic Mo precursors and graphene oxides allows for uniform and tight alignment of edge-oriented MoS2 nanosheets on planar graphene. The unique sheet-on-sheet architecture is of grand advantage in synergistically utilizing the highly conductive graphene and the electroactive MoS2, thus rendering boosted reaction kinetics and robust structural integrity for energy storage. Consequently, the heterostructured MoS2@graphene exhibits impressive Li/Na-ion storage properties, including high-capacity delivery and superior rate/cycling capability. The present study will provide a positive impetus on rational design of 2D metal sulfide/graphene composites as advanced electrode materials for high-efficient alkali–metal ion storage.
Highlights
The increasing social concern on natural resources and environmental problems has triggered extensive research activities on the development of sustainable and renewable resources of solar energy and wind power (Yang et al, 2011)
The homogeneous anchoring of 2D MoS2 nanostructures onto the rGO nanosheets is validated by the even distribution of elemental C, Mo, and S from the energydispersive X-ray (EDX) mapping (Figure 1C)
TEM imaging (Figure 1D) presents the hybrid sheet-on-sheet configuration, wherein the nanostructured MoS2 deposits are clearly patterning on the whole rGO nanosheet surface
Summary
The increasing social concern on natural resources (e.g., fossil fuels) and environmental problems (e.g., climate change) has triggered extensive research activities on the development of sustainable and renewable resources of solar energy and wind power (Yang et al, 2011). Rechargeable battery technologies, including Li-ion batteries and Na-ion batteries, stand at the forefront of the EES devices due to their high energy density (Yabuuchi et al, 2014). To meet the ever-increasing demands of energy/power densities for applications ranging from portable consumer electronics and electric vehicles to large-scale smart utility grids, it is of great necessity to improve the battery performance by developing advanced electrode materials. Transition metal dichalcogenides (TMDs) represent a class of promising 2D nanomaterials for use in Li-ion/Na-ion batteries (Xu et al, 2014; Yun et al, 2018; Zhu et al, 2021). Among the well-studied TMDs, MoS2 has been considered to be a prominent candidate due to its high specific capacity and low cost (Wu et al, 2020).
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