PEG-200-assisted hydrothermal method for the controlled-synthesis of highly dispersed hollow Fe3O4 nanoparticles

Herein, we have developed a facile one-pot PEG-200-assited hydrothermal method for the controlled-synthesis of highly dispersed hollow Fe3O4 nanoparticles (∼150 nm in diameter, ∼25 nm in wall-thickness). Magnetic domains of hollow Fe3O4 nanoparticles are relatively regular with domain width of ∼150 nm. The capacity of hollow Fe3O4 nanoparticles retained 599 mA h g−1 after 50 cycles at 85 mA h g−1. When returning to the initial rate of 100 mA h g−1, the hollow Fe3O4 nanoparticles electrode returns a lower capacity (315 mA h g−1) than the original capacity (433 mA h g−1).