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|Title:||Ultrathin titanate nanosheets/graphene films derived from confined transformation for excellent Na/K ion storage|
|Citation:||Angewandte Chemie International Edition, 2018; 57(28):8540-8544|
|Cheng Zeng, Fangxi Xie, Xianfeng Yang, Mietek Jaroniec, Lei Zhang, and Shi-Zhang Qiao|
|Abstract:||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 NTO/rGO electrode for sodium ion batteries exhibited an excellent rate performance and long cycling stability characterized by reversible capacity of 72 mA h g-1 at 5 A g-1 after 10000 cycles. Moreover, flexible KTO/rGO electrode for potassium ion batteries maintained a reversible capacity of 75 mA h g-1 after 700 cycles at 2 A g-1. These results demonstrate the superiority of the unique sandwich-type electrodes.|
|Keywords:||anode materials; sandwich structures; sodium titanate; sodium-ion batteries; ultrathin nanosheets|
|Rights:||Copyright 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim|
|Appears in Collections:||Chemical Engineering publications|
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