Journal
RSC ADVANCES
Volume 6, Issue 28, Pages 23659-23665Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra23960e
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Funding
- Shanghai Municipal Education Commission [09YZ387, 11ZZ179]
- Science and Technology Commission of Shanghai Municipality [09QT1400600]
- ShuGuang Project [11SG54]
- National Natural Science Foundation of China [20976105]
- Shanghai Leading Academic Discipline Project [J51503]
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Self-assembled graphene coupled hollow-structured gamma-Fe2O3 spheres (SHFS) were synthesized using a simple hydrothermal method combined with an easy annealing route. In the SHFS crystals, alpha-Fe2O3 completely transformed into gamma-Fe2O3 upon annealing at 500 degrees C under N-2 atmosphere. SHFS-500 was also found to have a high specific surface area of 198 m(2) g(-1) and to have the characteristics of a good supercapacitor electrode material, an ultrahigh specific capacitance of 332.7 F g(-1) at a current density of 2 A g(-1), good rate capability, and excellent cycling stability. This enhanced electrochemical performance may be due to the optimal architecture of the hollow-structured gamma-Fe2O3 as a result of the extraordinary electrical conductivity of graphene sheets combined with the easy annealing at 500 degrees C.
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