▎ 摘　　要

Iron oxides have been recognized as a potential electrode material for lithium-ion and sodium-ion batteries owing to their relatively ultrahigh theoretical capacity, low-cost and earth-rich resources. Nevertheless, the rapid capacity degradation and sluggish kinetics seriously limit their practical applications. Herein, the kinetics enhanced ultrafine Fe2O3 nanocrystals (-5 nm) well anchored on graphene are prepared for high-rate lithium and sodium storage. The unique structure could provide abundant electrochemical active edge sites, short ion/ electron diffusion pathways, and excellent electrical conductivity, allowing for enhanced electron/ion transport/ diffusion kinetics. The fabricated Fe2O3/reduced graphene oxide nanocomposite shows impressive discharge capacity (1175 mAh g-1 at 0.2 A g-1), significant rate performance (822 mAh g-1 at 5 A g-1) and stable longterm cycle durability (993 mAh g-1 after 500 cycles at 1 A g-1) as a lithium-ion battery anode. As for sodium-ion storage, it also shows high discharge capacity of 701 mAh g-1 at 0.1 A g-1 and remarkable rate performance (253 mAh g-1 at 2 A g-1). These above intriguing electrochemical performances outperform most of the so-far recorded Fe2O3 based electrodes. Such material design strategy may pave a new way for the development of outstanding performance anode materials based on earth-rich materials for energy storage application.