Fe2O3 nanocrystals anchored onto graphene nanosheets as the anode material for low-cost sodium-ion batteries

Fe2O3 nanocrystals were uniformly anchored onto graphene nanosheets (Fe2O3@GNS) by a nanocasting technique, and the resulting composites were applied as anodes of sodium-ion batteries. Fe2O3@GNS exhibits excellent cycling performance and rate capability.