Fig. 6From: Progress in Iron Oxides Based Nanostructures for Applications in Energy StorageReprinted with Permission from [54]. Copyright, American Chemical Societya, b FESEM and c TEM images of hollow Fe2O3 microboxes obtained at 350 °C. d Schematic illustration of the formation of hollow Fe2O3 microboxes and the evolution of the shell structure with the increasing calcination temperature.Back to article page