▎ 摘　　要

Aqueous nickel-iron (Ni-Fe) batteries provide a sustainable solution for large-scale power sources, but their practical applications are still restrained by the nonstable Fe anodes. A simple, inexpensive and mass-manufacturable one-pot strategy is used to in situ grow Fe2O3 nanoparticles on graphene sheets for preparing a chemically coupled Fe2O3/graphene hydrogel (Fe2O3@GH), of which the pore structure can be well rationally tuned by the ratio of graphene to Fe2O3. In contrast to the conventional iron oxide/carbon anodes (FeOx/C), Fe2O3@GH anode in Ni-Fe batteries delivers much higher specific capacity (287.2 mAh g(-1) vs. 159.5 mAh g(-1) at 2 A g(-1)), better stability (capacity retention of 95 % vs. 61.2 % after 1000 charge/discharge cycles) and superior power density comparable with supercapacitors. More remarkably, the assembled full rechargeable Ni-Fe battery made from Ni(OH)(2) microspheres growing on Ni foam (Ni(OH)(2) MSs@NF) (+)//Fe2O3@GH (-) achieves excellent cycling stability (retention of 82 % of specific capacity after 500 cycles) at a large operating potential of 1.6 V, while delivering the largest energy density of 203 Wh kg(-1) and also a highest power density of 6.4 kW kg(-1) among the reported full Ni-Fe batteries. This work holds great promises to fabricate alternative safer high-performance vehicle batteries.