Abstract
A facile one-step solution reaction route for growth of novel MoS2 nanorose cross-linked by 3D rGO network, in which the MoS2 nanorose is constructed by single-layered or few-layered MoS2 nanosheets, is presented. Due to the 3D assembled hierarchical architecture of the ultrathin MoS2 nanosheets and the interconnection of 3D rGO network, as well as the synergetic effects of MoS2 and rGO, the as-prepared MoS2-NR/rGO nanohybrids delivered high specific capacity, excellent cycling and good rate performance when evaluated as an anode material for lithium-ion batteries. Moreover, the nanohybrids also show excellent hydrogen-evolution catalytic activity and durability in an acidic medium, which is superior to MoS2 nanorose and their nanoparticles counterparts.
Highlights
A facile one-step solution reaction route for growth of novel MoS2 nanorose cross-linked by 3D reduced graphene oxide (rGO) network, in which the MoS2 nanorose is constructed by single-layered or few-layered MoS2 nanosheets, is presented
The 3D architecture assembled with MoS2-NR and rGO nanosheets is favored for preventing the aggregation of these nano/microcrystals and graphene sheets, which is essential for the cycling stability[52]
The excellent lithium storage performance of the MoS2-NR/rGO can be attributed to the rational design of the unique MoS2 nanostructure and the synergistic effect between MoS2 NRs and rGO. (1) 3D assembly of single-layer MoS2 nanosheets into flowers
Summary
Yanyan Zhao1*, Long Kuai2*, Yanguo Liu3*, Pengpeng Wang[4], Hamidreza Arandiyan[5], Sufeng Cao[6], Jie Zhang[7], Fengyun Li8, Qing Wang[2], Baoyou Geng2 & Hongyu Sun[1]. The freshly prepared MoS2 layers have a tendency to aggregate during practical application even in the drying process, resulting in the loss of active sites of ultrathin 2D nanostructures This rose structure assembled by single-layer will expose many edges, which is closely related to the large surface area of the layers and decrement the agglomeration efficiently. The improved capacity and cycle life of MoS2-NR/rGO cell may be attributed to the hierarchical porous nature arisen by single-layer MoS2 nanosheets assembled flowers and 3D rGO network, which is more convenient and accessible for electrolyte diffusion and intercalation of Li ions into the active phases. The EIS results show that the addition of rGO preserved the high conductivity of the composite electrode, and largely enhanced the electrochemical activity of MoS2-NR during the cycling processes. The sample still maintain the initial morphology after the cycling test (see Figure S6 in the Supplementary Information), which reveals the good stabilities of the nanohybrid structures during charge/discharge cycling
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