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Ultrathin Titanate Nanosheets/Graphene Films Derived from Confined Transformation for Excellent Na/K Ion Storage |
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| Authors: | Cheng Zeng Fangxi Xie Prof Xianfeng Yang Prof Mietek Jaroniec Prof Lei Zhang Prof Shi‐Zhang Qiao |
| Institution: | 1. Key Lab of Heat Transfer Enhancement and Energy Conservation of Ministry of Education, School of Chemistry & Chemical Engineering, South China University of Technology, Guangzhou, P. R. China;2. School of Chemical Engineering, The University of Adelaide, Adelaide, Australia;3. Analytical and Testing Centre, South China University of Technology, Guangzhou, P. R. China;4. Department of Chemistry and Biochemistry, Kent State University, Kent, OH, USA;5. School of Materials Science and Engineering, Tianjin University, Tianjin, P. R. China |
| 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 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. |
| Keywords: | anode materials sandwich structures sodium titanate sodium-ion batteries ultrathin nanosheets |