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Ultrathin Titanate Nanosheets/Graphene Films Derived from Confined Transformation for Excellent Na/K Ion Storage
Author(s) -
Zeng Cheng,
Xie Fangxi,
Yang Xianfeng,
Jaroniec Mietek,
Zhang Lei,
Qiao ShiZhang
Publication year - 2018
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201803511
Subject(s) - graphene , materials science , titanate , anode , chemical engineering , oxide , electrode , titanium , diffusion , nanotechnology , composite material , ceramic , metallurgy , chemistry , physics , engineering , thermodynamics
Confined transformation of assembled two‐dimensional MXene (titanium carbide) and reduced graphene oxide (rGO) nanosheets was employed to prepare the free‐standing films of the integrated ultrathin sodium titanate (NTO)/potassium titanate (KTO) nanosheets sandwiched between graphene layers. The ultrathin Ti‐based nanosheets reduce the diffusion distance while rGO layers enhance conductivity. Incorporation of graphene into the titanate films produced efficient binder‐free anodes for ion storage. The resulting flexible NTO/rGO and KTO/rGO electrodes exhibited excellent rate performances and long cycling stability characterized by reversible capacities of 72 mA h g −1 at 5 A g −1 after 10000 cycles and 75 mA h g −1 after 700 cycles at 2 A g −1 for sodium and potassium ion batteries, respectively. These results demonstrate the superiority of the unique sandwich‐type electrodes.