标题：One-Step In Situ Formation of N-doped Carbon Nanosheet 3D Porous Networks/TiO2 Hybrids with Ultrafast Sodium Storage
作者：Li, Baosong ;Xi, Baojuan ;Wu, Fangfang ;Mao, Hongzhi ;Liu, Jing ;Feng, Jinkui ;Xiong, Shenglin
作者机构：[Li, Baosong ;Xi, Baojuan ;Wu, Fangfang ;Mao, Hongzhi ;Xiong, Shenglin ] Key Laboratory of the Colloid and Interface Chemistry, Ministry of Education, 更多
来源：Advanced Energy Materials
摘要：In spite of the satisfactory advancement in preparing TiO2-based hybrid structures, most methods rely on additional template-based multistep reactions for engineering the given structure. Herein, a unique self-template and in situ recrystallization strategy is explored to synthesize uniform flowerlike multicompositional structures of nitrogen-doped porous carbon nanosheet networks immobilizing TiO2 nanoparticles (TiO2∩NPCSs) via a self-prepared single precursor and subsequent thermal treatment. Depending on the unique coordination ability of 2,4-dihydroxybenzoic acid with metal ions under alkaline conditions to form a flowerlike network, a self-produced single precursor can be achieved. Careful investigations of the self-prepared precursor reveal a high practicability of the present synthetic scheme. Because of the novel structural and compositional features, these TiO2∩NCSN flowers indicate superior sodium storage properties when evaluated as anodes for sodium-ion batteries. Impressively, the TiO2∩NCSN flowers deliver high reversible capacities of 152 mAh g−1 at 2C for 3000 cycles and 114 mAh g−1 at 10C for 10000 cycles, as well as an ultrahigh rate capability up to 50C with a capacity of 101 mAh g−1. The facile method could stimulate further capability in precise construction of complex architectures with complicated compositions for different device applications.
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