Dual-ZIF-derived "reassembling strategy" to hollow MnCoS nanospheres for aqueous asymmetric supercapacitors.
Dual-ZIF-derived "reassembling strategy" to hollow MnCoS nanospheres for aqueous asymmetric supercapacitors.
复制标题
用于水性不对称超级电容器的中空 MnCoS 纳米球的双 ZIF 衍生“重组策略”
作者：
用一种简便、温和、经济的方法构建精细的纳米结构是构建高性能电极材料的关键问题。我们展示了一种简单而新颖的“重组策略”，以空心MnCoS纳米球衍生自双ZIF的超级电容器。通过调节溶剂热反应时间，可以控制球壳的表面结构、厚度和锰的分布。研究了材料的化学组成、物相、比表面积和微观结构，并对材料的电化学性能进行了系统评价。由于独特的低结晶度和优化的中空纳米球结构有助于增加活性位点，MnCoS纳米球表现出优异的电化学性能。测试结果表明，比电容随着溶剂热时间的增加而增加，并且反应时间为5 h的MCS表现出最佳的电化学性能，具有957 C g − 1（1 A g − 1）的高比容量。此外，MCS-5//AC非对称超级电容器装置在750 W kg − 1的比功率下提供高达36.9 W h kg − 1的比能量。提出了一种新颖的表面“重组策略”，从双ZIF合成中空MnCoS纳米球。优化的MnCoS纳米球具有957 C g − 1的高比容量。MCS-5//AC ASC的比能量为36.9 W h kg − 1。
Construction of delicate nanostructures with a facile, mild-condition and economical method is a key issue for building high-performance electrode materials. We demonstrate a facile and novel “reassembling strategy” to hollow MnCoS nanospheres derived from dual-ZIF for supercapacitors. The spherical shell's surface structure, thickness and Mn distribution were controlled by regulating the solvothermal reaction time. The chemical composition, phases, specific surface areas and microstructure were studied and the electrochemical performances were systematically estimated. As the unique low-crystalline and optimized hollow nanosphere structure contributes to increasing active sites, MnCoS nanospheres exhibit excellent electrochemical performance. The test results show that the specific capacitance increases with increasing solvothermal time, and the MCS with a 5 h reaction time exhibits optimal electrochemical properties with a high specific capacity of 957 C g−1 (1 A g−1). Furthermore, an MCS-5//AC asymmetric supercapacitor device delivers a specific energy as high as 36.9 W h kg−1 at a specific power of 750 W kg−1. A facial and novel “reassemble strategy” was demonstrated to synthesize hollow MnCoS nanospheres from dual-ZIF. Optimized MnCoS nanospheres exhibits a high specific capacity of 957 C g−1. An MCS-5//AC ASC delivers a specific energy of 36.9 W h kg−1.
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DOI：
10.1016/j.colsurfa.2020.125650
发表时间：
2021-01-20
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