Liu Xiong, Xiong Hougao, Yang Yifu, Dong Jinfeng, Li Xuefeng
College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P. R. China.
ACS Omega. 2018 Oct 12;3(10):13146-13153. doi: 10.1021/acsomega.8b01299. eCollection 2018 Oct 31.
A new approach to develop novel hollow urchinlike copper oxide (CuO) microspheres by the hydrothermal method was reported, and zwitterionic alkyldimethylbetaine (BS) surfactants were employed as templates in the classic copper-ammonia complex systems. Effects of numerous environmental factors on the morphology of CuO particles were studied systematically, in which the concentration and structure of BS predominantly affected the developed CuO materials. It was noticed that hollow urchinlike CuO microspheres were generally formed in the presence of BS regardless of the reaction temperature and time and the source of copper ions. Generally speaking, high concentrations of BS and BS with longer chain length strongly favored the formation of hollow urchinlike CuO microspheres. The microstructures of synthesized CuO particles were studied in detail, and the corresponding formation mechanism of hollow urchinlike CuO microspheres was also proposed based on the selective adsorption of BS on the particular crystal facets of CuO crystals. Moreover, hollow urchinlike CuO microspheres showed excellent performance in the lithium-ion batteries as anode materials with a reversible capability of 511 mA h·g at 0.1 C after 40 charge-discharge cycles, which was one of the best values of CuO materials reported in this field.
报道了一种通过水热法制备新型空心海胆状氧化铜（CuO）微球的新方法，在经典的铜氨络合物体系中使用两性离子烷基二甲基甜菜碱（BS）表面活性剂作为模板。系统研究了众多环境因素对CuO颗粒形貌的影响，其中BS的浓度和结构对所制备的CuO材料影响较大。值得注意的是，无论反应温度、时间以及铜离子来源如何，在BS存在的情况下通常都会形成空心海胆状CuO微球。一般来说，高浓度的BS以及链长较长的BS更有利于空心海胆状CuO微球的形成。详细研究了合成的CuO颗粒的微观结构，并基于BS在CuO晶体特定晶面上的选择性吸附提出了空心海胆状CuO微球相应的形成机理。此外，空心海胆状CuO微球作为锂离子电池的负极材料表现出优异的性能，在0.1 C下经过40次充放电循环后可逆容量为511 mA h·g，这是该领域报道的CuO材料的最佳值之一。
