Formation of Double-Shelled Zinc-Cobalt Sulfide Dodecahedral Cages from Bimetallic Zeolitic Imidazolate Frameworks for Hybrid Supercapacitors.
Formation of Double-Shelled Zinc-Cobalt Sulfide Dodecahedral Cages from Bimetallic Zeolitic Imidazolate Frameworks for Hybrid Supercapacitors.
复制标题
DOI：
10.1002/anie.201702649
复制
发表时间：
2017-06
影响因子：
--
通讯作者：
Peng Zhang;B. Guan;Le Yu;X. Lou
中科院分区：
文献类型：
--
作者：
Peng Zhang;B. Guan;Le Yu;X. Lou
复杂的金属有机框架作为前体允许设计和构建各种纳米结构的功能材料，这可能是无法通过其他方法获得的。在这里，我们开发了一个顺序的化学蚀刻和硫化策略，以制备定义明确的双壳锌钴硫化物（Zn-Co-S）菱形十二面体笼（RDC）。首先通过可控化学刻蚀法合成了蛋黄壳锌/钴基咪唑骨架沸石（Zn/Co-ZIF）RDC，然后通过水热硫化反应制备了双壳Zn-Co-S RDC。此外，在这项工作中报告的策略，使容易控制的Zn/Co的摩尔比在所获得的双壳Zn-Co-S RDC。由于结构和组成的益处，所获得的双壳Zn-Co-S RDC表现出增强的性能，具有高比电容（在1A g-1下为1266 F g-1）、良好的倍率性能和长期循环稳定性（在10，000次循环中保持91%），作为混合超级电容器的电池型电极材料。
Complex metal-organic frameworks used as precursors allow design and construction of various nanostructured functional materials which might not be accessible by other methods. Here, we develop a sequential chemical etching and sulfurization strategy to prepare well-defined double-shelled zinc-cobalt sulfide (Zn-Co-S) rhombic dodecahedral cages (RDCs). Yolk-shelled zinc/cobalt-based zeolitic imidazolate framework (Zn/Co-ZIF) RDCs are first synthesized by a controlled chemical etching process, followed by a hydrothermal sulfurization reaction to prepare double-shelled Zn-Co-S RDCs. Moreover, the strategy reported in this work enables easy control of the Zn/Co molar ratio in the obtained double-shelled Zn-Co-S RDCs. Owing to the structural and compositional benefits, the obtained double-shelled Zn-Co-S RDCs exhibit enhanced performance with high specific capacitance (1266 F g-1 at 1 A g-1 ), good rate capability and long-term cycling stability (91 % retention over 10,000 cycles) as a battery-type electrode material for hybrid supercapacitors.