摘要
Chemically integrated hybrid nanostructures of Fe 2 O 3 /holey graphene frameworks (Fe 2 O 3 /HGF) nanocomposites have been successfully synthesized via a glycerol activated process. Defected graphene oxides were first etched by a certain volume of hydrogen peroxide. Subsequently, multi-dimensionally nanosized Fe 2 O 3 particles were generated and anchored on the defected graphene layers. Based on this method, the ability in synthesizing the exquisitely tune Fe 2 O 3 nanoparticles with highly controllable nanostructures and desirable properties is demonstrated, ranging from zero-dimensional quantum dots (~4.42 nm) to one-dimensional nanorods, and eventually to two-dimensional nanosheets. As anodes for lithium-ion batteries, these hybrid Fe 2 O 3 /holey graphene frameworks electrodes exhibit excellent cyclic stability at 1 A g −1 after 500 cycles (73.59 mAh g −1 for quantum dots Fe 2 O 3 /HGF electrodes, 695.4 mAh g −1 for nanosheets Fe 2 O 3 /HGF electrodes and 805.6 mAh g −1 for nanorods Fe 2 O 3 /HGF electrodes, respectively) and specific capacity retention at the current density of 4 A g −1 (427.6 mAh g −1 for quantum dots Fe 2 O 3 /HGF electrodes, 374.2 mAh g −1 for nanosheets Fe 2 O 3 /HGF electrodes and 473.5 mAh g −1 for nanorods Fe 2 O 3 /HGF electrodes, respectively). This work reveals a facile way to modify the oxygenic defect sites of carbon-based materials, providing more attaching sites for metal oxides, and hopefully accelerating the commercialization of carbon-based nanocomposites as anodes for metal-ion batteries.