Wang Xiao, Chen Ye, Fang Yongjin, Zhang Jintao, Gao Shuyan, Lou Xiong Wen David
School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore.
School of Materials Science and Engineering, Henan Normal University, Xinxiang, Henan, 453007, P. R. China.
Angew Chem Int Ed Engl. 2019 Feb 25;58(9):2675-2679. doi: 10.1002/anie.201812387. Epub 2019 Jan 29.
We report the synthesis of cobalt sulfide multi-shelled nanoboxes through metal-organic framework (MOF)-based complex anion conversion and exchange processes. The polyvanadate ions react with cobalt-based zeolitic imidazolate framework-67 (ZIF-67) nanocubes to form ZIF-67/cobalt polyvanadate yolk-shelled particles. The as-formed yolk-shelled particles are gradually converted into cobalt divanadate multi-shelled nanoboxes by solvothermal treatment. The number of shells can be easily controlled from 2 to 5 by varying the temperature. Finally, cobalt sulfide multi-shelled nanoboxes are produced through ion-exchange with S ions and subsequent annealing. The as-obtained cobalt sulfide multi-shelled nanoboxes exhibit enhanced sodium-storage properties when evaluated as anodes for sodium-ion batteries. For example, a high specific capacity of 438 mAh g can be retained after 100 cycles at the current density of 500 mA g .
我们报道了通过基于金属有机框架（MOF）的复合阴离子转化和交换过程合成硫化钴多壳纳米盒。多钒酸盐离子与钴基金属有机框架-67（ZIF-67）纳米立方体反应形成ZIF-67/钴多钒酸盐蛋黄壳颗粒。通过溶剂热处理，所形成的蛋黄壳颗粒逐渐转化为二钒酸钴多壳纳米盒。通过改变温度，可以轻松地将壳的数量从2个控制到5个。最后，通过与S离子进行离子交换并随后退火，制备出硫化钴多壳纳米盒。当将所获得的硫化钴多壳纳米盒用作钠离子电池的阳极进行评估时，其展现出增强的储钠性能。例如，在500 mA g的电流密度下循环100次后，仍可保持438 mAh g的高比容量。
