Liu Song, Chen Kun, Xue Changguo, Nie Shibin, Li Jianjun, Zhu Jinbo
School of Materials Science and Engineering, Anhui University of Science and Technology Huainan Anhui 232001 P. R. China
School of Safety Science and Engineering, Anhui University of Science and Technology Huainan Anhui 232001 P. R. China.
RSC Adv. 2022 Aug 31;12(38):24769-24777. doi: 10.1039/d2ra03914a. eCollection 2022 Aug 30.
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 A g). Furthermore, an MCS-5//AC asymmetric supercapacitor device delivers a specific energy as high as 36.9 W h kg at a specific power of 750 W kg.
采用简便、温和条件且经济的方法构建精细的纳米结构是制备高性能电极材料的关键问题。我们展示了一种简便且新颖的“重组策略”，用于制备源自双金属有机框架（dual-ZIF）的中空MnCoS纳米球以用于超级电容器。通过调节溶剂热反应时间来控制球壳的表面结构、厚度和Mn分布。研究了其化学成分、相、比表面积和微观结构，并系统评估了其电化学性能。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，比电容随溶剂热时间的增加而增大，反应时间为5 h的MnCoS（MCS）表现出最佳的电化学性能，在1 A g时具有957 C g的高比容量。此外，一个MCS-5//活性炭（AC）非对称超级电容器装置在750 W kg的比功率下可提供高达36.9 W h kg的比能量。
