Morphology Effects on the Supercapacitive Electrochemical Performances of Iron Oxide/Reduced Graphene Oxide Nanocomposites

abstract

The benzyl alcohol route is used to decorate reduced graphene oxide (RGO) nanosheets with iron oxide (FeOx) nano-particles. The resulting FeOx/RGO composites combine both electrical double-layer capacitive and pseudocapacitive behaviors of RGO and FeOx, respectively, owing to the hybrid nano-structure. In 1m Na2SO4 aqueous electrolyte, the capacitance of the FeOx/RGO electrode reaches 126 Fg(-1) in a negative potential range from -0.8 to 0.0 V (vs. Ag/AgCl) and 97 Fg(-1) in the extended potential window from -0.8 to + 0.7 V (vs. Ag/AgCl). By using the benzyl alcohol route, a higher concentration of iron precursor leads to full surface coverage of the RGO nanosheets by smaller FeOx nanoparticles, forming a close-packed layer that limits the restacking of RGO nonosheets in the dry state. The resulting FeOx/RGO composite gains the same power capability as RGO and a higher energy density than raw FeOx, owing to this well-designed morphology.

keywords

ENERGY MANAGEMENT; CAPACITORS; STORAGE; SHEETS; FILMS; GAMMA-FE2O3; COMPOSITE; DENSITY

subject category

Electrochemistry

authors

Gao, PC; Russo, PA; Conte, DE; Baek, S; Moser, F; Pinna, N; Brousse, T; Favier, F

our authors

Groups

acknowledgements

The authors acknowledge the French Centre National pour la Recherche Scientifique (CNRS) for funding. P.-C.G. gratefully thanks the Chinese Scientific Council for a PhD fellowship.

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