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ABSTRACT:A new type of crosslinked chitosan was prepared using Dihydroxy azacrown ether as the crosslinking agent. Its structure was confirmed by elemental analysis, Fourier transform infrared (FTIR) spectra analysis, solid-state 13 C nuclear magnetic resonance (NMR) analysis, and X-ray diffraction analysis.

A three-dimensional (3D) reduced graphene oxide (rGO)/multi-walled carbon nanotubes (MWCNTs)/ Fe 2 O 3 ternary composite was fabricated by a facile, green and economical one-step urea-assisted hydrothermal approach as a promising anode material for high-performance lithium ion batteries. Designing and tailoring the 3D porous hierarchical nanostructure of rGO/MWCNTs/Fe 2 O 3 contributes to a robust hybrid material with overwhelmingly superior electrochemical performances compared with bare Fe 2 O 3 , MWCNTs/Fe 2 O 3 , rGO/Fe 2 O 3 and a physical mixture of rGO/Fe 2 O 3 and MWCNTs, due to the strong synergistic effects among the individual component. The 3D rGO/MWCNTs/Fe 2 O 3 composite exhibits highly enhanced specific capacity, cycling performance and rate capability: initial discharge and charge capacities of 1692 and 1322 mAh g 21 at 100 mA g 21 , respectively, 1118 mAh g 21 after 50 cycles at 100 mA g 21 and 785 mAh g 21 at 1000 mA g 21 . The assembling mechanism well illustrates the simple strategy, and the comprehensive electrochemical investigations further demonstrate its supernormal effectiveness, which could be extended to various transition metal oxides for energy storage and conversion.

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