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Morphology Effects on the Supercapacitive Electrochemical Performances of Iron Oxide/Reduced Graphene Oxide Nanocomposites
Author(s) -
Gao PengCheng,
Russo Patrícia A.,
Conte Donato E.,
Baek Seunghwan,
Moser François,
Pinicola,
Brousse Thierry,
Favier Frédéric
Publication year - 2014
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201300087
Subject(s) - graphene , materials science , oxide , supercapacitor , chemical engineering , nanocomposite , electrochemistry , nanoparticle , benzyl alcohol , electrolyte , electrode , nanotechnology , metallurgy , catalysis , chemistry , organic chemistry , engineering
The benzyl alcohol route is used to decorate reduced graphene oxide (RGO) nanosheets with iron oxide (FeOx) nanoparticles. The resulting FeOx/RGO composites combine both electrical double‐layer capacitive and pseudocapacitive behaviors of RGO and FeOx, respectively, owing to the hybrid nanostructure. In 1 M Na 2 SO 4 aqueous electrolyte, the capacitance of the FeOx/RGO electrode reaches 126 F g −1 in a negative potential range from −0.8 to 0.0 V (vs. Ag/AgCl) and 97 F g −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,.