Journal
MATERIALS TODAY COMMUNICATIONS
Volume 25, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.mtcomm.2020.101540
Keywords
Iron oxide (Fe3O4); Graphene; Reduced graphene oxide; Alkaline electrolyte; Rechargeable Fe-air batteries
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Funding
- Japan Society for the Promotion of Science (JSPS) [JP17K18985]
- JSPS KAKENHI [JP18K14013, JP18F18063]
- Toyohashi University of Technology Research Support Fund
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A simple formation of iron oxide (Fe3O4)-embedded reduced graphene oxide (rGO) composite was demonstrated using the chemical precipitation method proposed in this study. The rGO consisted of exfoliated nanosheets serves as a good framework for penetration and adsorption of the Fe precursor, allowing homogeneous formation of Fe3O4 crystals within the rGO nanosheet structure. The Fe3O4/rGO composite electrode, containing 60 wt.% Fe3O4, demonstrated promising electrochemical behavior at different scan rates. In a three-electrode charge discharge measurement, a prolonged cyclic performance with good capacity retention for 100 cycles was obtained. In the battery performance evaluation for alkaline aqueous rechargeable Fe-air batteries, a maximum and stable discharge capacity of approximately 420 mA h g(-1) was achieved. This simple fabrication method of Fe3O4/rGO composites is very promising not only for large-scale active materials fabrication for Fe-air batteries with enhanced performance, but also serves as a good platform for the development of complex-oxide-rGO hybrids in high performance energy storage materials.
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