有序介孔化学计量金属氧化物的分子设计策略
Molecular Design Strategy for Ordered Mesoporous Stoichiometric Metal Oxide.
作者信息
Wang Changyao, Wan Xiaoyue, Duan Linlin, Zeng Peiyuan, Liu Liangliang, Guo Dingyi, Xia Yuan, Elzatahry Ahmed A, Xia Yongyao, Li Wei, Zhao Dongyuan
机构信息
Laboratory of Advanced Materials, Department of Chemistry, Shanghai Key Lab of Molecular Catalysis and Innovative Materials, iChEM and State Key Laboratory of Molecular Engineering of Polymers, Fudan University, Shanghai, 200433, China.
Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing, 211816, China.
出版信息
Angew Chem Int Ed Engl. 2019 Oct 28;58(44):15863-15868. doi: 10.1002/anie.201907748. Epub 2019 Sep 11.
A molecular design strategy is used to construct ordered mesoporous Ti -doped Li Ti O nanocrystal frameworks (OM-Ti -Li Ti O ) by the stoichiometric cationic coordination assembly process. Ti /Li -citrate chelate is designed as a new molecular precursor, in which the citrate can not only stoichiometrically coordinate Ti with Li homogeneously at the atomic scale, but also interact strongly with the PEO segments in the Pluronic F127. These features make the co-assembly and crystallization process more controllable, thus benefiting for the formation of the ordered mesostructures. The resultant OM-Ti -Li Ti O shows excellent rate (143 mAh g at 30 C) and cycling performances (<0.005 % fading per cycle). This work could open a facile avenue to constructing stoichiometric ordered mesoporous oxides or minerals with highly crystalline frameworks.
采用分子设计策略，通过化学计量阳离子配位组装过程构建有序介孔Ti掺杂LiTi₂O₄纳米晶框架（OM-Ti-LiTi₂O₄）。设计Ti³⁺/Li⁺-柠檬酸盐螯合物作为一种新的分子前驱体，其中柠檬酸盐不仅能在原子尺度上使Ti与Li进行化学计量的均匀配位，还能与Pluronic F127中的PEO链段强烈相互作用。这些特性使共组装和结晶过程更可控，从而有利于形成有序介观结构。所得的OM-Ti-LiTi₂O₄表现出优异的倍率性能（30℃下为143 mAh g⁻¹）和循环性能（每循环<0.005%的衰减）。这项工作可为构建具有高度结晶框架的化学计量有序介孔氧化物或矿物开辟一条简便途径。
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