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Remarkable Enhancement in Sodium‐Ion Kinetics of NaFe 2 (CN) 6 by Chemical Bonding with Graphene
Author(s) -
Li Weijie,
Han Chao,
Xia Qingbing,
Zhang Kai,
Chou Shulei,
Kang YongMook,
Wang Jiazhao,
Liu Hua Kun,
Dou Shi Xue
Publication year - 2018
Publication title -
small methods
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.66
H-Index - 46
ISSN - 2366-9608
DOI - 10.1002/smtd.201700346
Subject(s) - graphene , oxide , composite number , materials science , chemical bond , ion , kinetics , chemical engineering , prussian blue , chemical stability , inorganic chemistry , nanotechnology , chemistry , composite material , organic chemistry , electrode , electrochemistry , metallurgy , physics , quantum mechanics , engineering
Abstract Hexacyanoferrate (Prussian blue, PB)/reduced graphene oxide (PB‐RGO) composites with a synergistic structure (graphene/PB/graphene) and a chemical bond are fabricated using a facile one‐step method that does not require any external chemical reducing agent. Here, Na 4 Fe(CN) 6 is decomposed in an acidic solution to produce Fe 2+ ions, which anchor onto the electronegative graphene oxide (GO) layers by electrostatic interaction and then reduce the GO. The formation of an FeOC chemical bond in the composite results in an excellent rate capability of the PB‐RGO composite at room temperature, delivering capacities of 78.1, 68.9, and 46.0 mAh g −1 even at the high rates of 10, 20, and 50 C, with a capacity retention of 70.2%, 63.4%, and 41.0%, respectively. The composite also shows an unprecedentedly outstanding cycling stability, retaining ≈90% of the initial capacity after 600 cycles.