Halide-ion-assisted synthesis of different α-Fe2O3 hollow structures and their lithium-ion storage properties

• Main Authors: Ma, Ruguang, Wang, Man, Dam, Duc Tai, Dong, Yucheng, Chen, Yu, Moon, Seung Ki, Yoon, Yong-Jin, Lee, Jong-Min
• Other Authors: School of Chemical and Biomedical Engineering
• Format: Article
• Language: English
• Published: 2015
• Subjects: DRNTU::Engineering::Mechanical engineering::Alternative, renewable energy sources
• Online Access: https://hdl.handle.net/10356/106869; http://hdl.handle.net/10220/25214; http://dx.doi.org/10.1002/cplu.201402236
• Institution: Nanyang Technological University

Various α-Fe2O3 hollow structures, such as wormlike shapes, ellipsoids, and quasicubes, were synthesized successfully by a halide-ion-assisted solvothermal method. The self-assembly assisted by selective absorption of halide ions and Ostwald ripening speeded up by acidic etching commonly determine the final unique structures. The electrochemical performance of the α-Fe2O3 with different structures in reversible lithium-ion storage was investigated, and showed that the hollow Fe2O3 quasicubes exhibit the best cycling performance with a charge capacity of 401.6 mAh g−1 after 100 cycles at 0.2 C. The superior cycling stability and high specific capacity can be ascribed to the higher specific surface area, lower charge-transfer resistance, and adequate alleviation of volume variation.