Abstract
Graphene oxide flexibly supported MoO2 porous architectures (MoO2/GO) by decomposition of the prepared ammonium molybdate/GO preforms is fabricated. Focused ion beam microscope analysis shows that the inside structures of the architectures strongly depend on the percentages of the GO used as flexible supports: micrometer scale MoO2 particulates growing on the GO (micrometer MoO2/GO), 3D honeycomb‐like nanoarchitectures (MoO2/GO nanohoneycomb), and layered MoO2/GO architectures are achieved at the percentage of GO at 4.3, 15.2, and 20.8 wt%, respectively. The lithium storage performance of the MoO2/GO architectures strongly depends on their inside structures. At the current density of 100 mA g−1, the capacities of the micrometer MoO2/GO, MoO2/GO nanohoneycomb, and layered MoO2/GO remain at 901, 1127, and 967 mAh g−1 after 100 cycles. The average coulombic efficiencies of micrometer MoO2/GO, MoO2/GO nanohoneycomb, and layered MoO2/GO electrodes are 97.6%, 99.3%, and 99.0%. Moreover, the rate performance shows even cycled at a high current density of 5000 mA g−1, the MoO2/GO nanohoneycomb can deliver the capacity as high as 461 mAh g−1. The MoO2/GO nanohoneycomb exhibits best performance attributed to its unique nanohoneycomb structure constructed with ultrafine MoO2 fixed on the GO flexible supports.
Highlights
Used as flexible supports: micrometer scale MoO2 particulates growing on the graphene oxide (GO), 3D honeycomb-like nanoarchitectures (MoO2/ GO nanohoneycomb), and layered MoO2/GO architectures are achieved at the percentage of GO at 4.3, 15.2, and 20.8 wt%, respectively
Nanoscale metal oxides, including MnO,[9] SnO2,[10,11] Co3O4,[12] NiO,[13] and Fe3O4,[14,15] used as anode active materials for Lithium ion batteries (LIBs) have been paid storage performance of the MoO2/GO architectures strongly depends on their inside structures
At the current density of 100 mA g−1, the capacities of the micrometer MoO2/GO, MoO2/GO nanohoneycomb, and layered MoO2/ GO remain at 901, 1127, and 967 mAh g−1 after 100 cycles
Summary
In order to show the effects of the inside pore structure of of water, an ammonium molybdate/GO preform formed. As to the micrometer MoO2/GO, it decreases from the first cycle to 10th cycle than increases from the 10th cycle to the 20th cycle, showing a transition between the MoO2/GO nanohoneycomb, layered MoO2/GO and bulk MoO2 particle, possibly attributed to that the size of MoO2 of micrometer MoO2/GO is in microm eter lever, which is between nanoscale MoO2 in the MoO2/GO nanohoneycomb and bulk lever MoO2 Another peaks at 2.50 V (red)/1.78 V (oxid) is ascribe to GO (The constant current discharge/charge voltage profile and the corresponding dQ/dV of the GO are provided, Supporting Information). The MoO2/GO nanohoneycomb shows much higher capacity compared with the other two MoO2/GO architectures, attributed to that fine MoO2 particles (around 50 nm) anchored on GO supports to form a honeycomb-like network structure with nanoscale pores (around 50 nm) All these provide efficient space for electrolyte transfer, and significantly decrease the diffusion distance of lithium ions and electrons. 1442 (50) 443.8 (850) 1138.5 (60) 873.7 (60) 1330 (100) 913 (typical) 390 (typical)
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call