纳米晶
材料科学
纳米技术
储能
电化学储能
金属有机骨架
超级电容器
电化学
化学工程
金属
电化学能量转换
电极
化学
冶金
功率(物理)
吸附
物理化学
有机化学
工程类
物理
量子力学
作者
Peitao Xiao,Fanxing Bu,Ranran Zhao,Mohamed F. Aly Aboud,Imran Shakir,Yuxi Xu
出处
期刊:ACS Nano
[American Chemical Society]
日期:2018-03-20
卷期号:12 (4): 3947-3953
被引量:110
标识
DOI:10.1021/acsnano.8b01488
摘要
Synthesis of ultrasmall metal-organic framework (MOF) nanoparticles has been widely recognized as a promising route to greatly enhance their properties but remains a considerable challenge. Herein, we report one facile and effective spatially confined thermal pulverization strategy to successfully transform bulk Co-MOF particles into sub-5 nm nanocrystals encapsulated within N-doped carbon/graphene (NC/G) by using conducting polymer coated Co-MOFs/graphene oxide as precursors. This strategy involves a feasible mechanism: calcination of Co-MOFs at proper temperature in air induces the partial thermal collapse/distortion of the framework, while the uniform coating of a conducting polymer can significantly improve the decomposition temperature and maintain the component stability of Co-MOFs, thus leading to the pulverization of bulk Co-MOF particles into ultrasmall nanocrystals without oxidation. The pulverization of Co-MOFs significantly increases the contact area between Co-MOFs with electrolyte and shortens the electron and ion transport pathway. Therefore, the sub-5 nm ultrasmall MOF nanocrystals-based composites deliver an ultrahigh reversible capacity (1301 mAh g-1 at 0.1 A g-1), extraordinary rate performance (494 mAh g-1 at 40 A g-1), and outstanding cycling stability (98.6% capacity retention at 10 A g-1 after 2000 cycles), which is the best performance achieved in all reported MOF-based anodes for lithium-ion batteries.
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