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Bi 2 O 3 @Reduced Graphene Oxide Nanocomposite: An Anode Material for Sodium‐Ion Storage
Author(s) -
Nithya Chandrasekaran
Publication year - 2015
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.201402394
Subject(s) - graphene , nanocomposite , materials science , oxide , anode , nanoparticle , chemical engineering , electrochemistry , bromide , diffusion , ion , nanotechnology , inorganic chemistry , chemistry , electrode , metallurgy , organic chemistry , physics , engineering , thermodynamics
The high capacity, excellent cyclability, and good rate capability of reduced graphene oxide (rGO) anchored with Bi 2 O 3 nanocomposite for sodium‐ion batteries is reported. A simple reduction method is adapted to deposit spherical Bi 2 O 3 nanoparticles on the surface of rGO sheets. The surfactant cetyltrimethylammonium bromide (CTAB) plays a major role in controlling the morphology of the Bi 2 O 3 nanoparticles. This Bi 2 O 3 @rGO nanocomposite has the advantages of high reversible capacity with a capacity retention (at high rate) of 70.2 % after 200 cycles at a current density of 350 mA g −1 . This superior performance can be attributed to the fact that rGO sheets hamper the volume expansion of Bi 2 O 3 nanoparticles and result in faster diffusion of Na + ions (diffusion coefficient: 5.12×10 −8 cm 2 s −1 ) and smaller internal resistance (84.17 Ω) compared with pristine Bi 2 O 3 nanoparticles. The results suggest that anchoring rGO sheets with metal oxides is one of the simplest ways to enhance the electrochemical performance of sodium‐ion batteries.