Wang Ying, Liu Fuyang, Ji Ying, Yang Min, Liu Wei, Wang Wei, Sun Qiushi, Zhang Ziqing, Zhao Xudong, Liu Xiaoyang
State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun, 130012, P. R. China.
Dalton Trans. 2015 Jun 14;44(22):10431-7. doi: 10.1039/c5dt00402k.
Three types of copper sulfides including CuS, Cu7S4 and Cu9S5 were successfully synthesized at different concentrations of ethylenediamine in a liquid phase synthesis process. The whole shape evolution of Cu7S4 microstructures could be manipulated by adjusting the concentration of ethylenediamine. This study indicates that the coordination chemistry of ethylenediamine ligands and copper cations exerts vital effects on the formation of the dendritic structure. Furthermore, experimental conditions such as the reaction temperature and time are also observed to have an impact on the morphology of copper sulfides. The structures of Cu7S4 with snowflake-like morphology provided special paths for ion diffusion. Therefore, apart from the excellent discharge rate and good stability, Cu7S4 also exhibits a high specific capacitance of 1303.01 F g(-1) at a current density of 5 A g(-1).
在液相合成过程中，通过不同浓度的乙二胺成功合成了三种硫化铜，包括CuS、Cu7S4和Cu9S5。通过调节乙二胺的浓度，可以控制Cu7S4微观结构的整体形状演变。该研究表明，乙二胺配体与铜阳离子的配位化学对树枝状结构的形成起着至关重要的作用。此外，还观察到反应温度和时间等实验条件对硫化铜的形貌有影响。具有雪花状形貌的Cu7S4结构为离子扩散提供了特殊路径。因此，除了优异的放电率和良好的稳定性外，Cu7S4在5 A g(-1)的电流密度下还表现出1303.01 F g(-1)的高比电容。
