Hunan Province Key Laboratory of Chemical Power Source, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China; Innovation Base of Energy and Chemical Materials for Graduate Students Training, Central South University, Changsha 410083, China; Public Security Fire Force College, Kunming 650208, China.
Hunan Province Key Laboratory of Chemical Power Source, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China.
J Colloid Interface Sci. 2020 Mar 7;562:518-528. doi: 10.1016/j.jcis.2019.11.083. Epub 2019 Nov 21.
A novel three-dimensional (3D) flower-like ZnO@Ag composite is successfully synthesized through a simple and facile process, which is characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS).When evaluated as an anodic material for nickel-zinc alkaline secondary batteries, the 3D flower-like ZnO@Ag composite exhibits the high discharge capacity (627 mAh g) and long cycle life (830 cycles). The outstanding electrochemical performance is ascribed to the Ag nanoparticles enhancing electron conductivity and the uniform flower-like structure providing enough electrochemical reaction sites, so as to reduce electrode polarization and improve cell efficiency. Furthermore, the possible growth mechanism of 3D flower-like ZnO@Ag composite has been proposed. The effect of silver content on formation of ZnO@Ag composites was also investigated in detail, indicating the appropriate silver content plays a key role in forming a defined 3 D flower-like structure for the ZnO@Ag composite.
一种新颖的三维（3D）花状 ZnO@Ag 复合材料通过简单易行的方法成功合成，其特点是 X 射线衍射（XRD）、扫描电子显微镜（SEM）和 X 射线光电子能谱（XPS）。当用作镍锌碱性二次电池的阳极材料时，3D 花状 ZnO@Ag 复合材料表现出高放电容量（627 mAh g-1）和长循环寿命（830 次循环）。优异的电化学性能归因于 Ag 纳米粒子增强了电子导电性和均匀的花状结构提供了足够的电化学反应位点，从而降低了电极极化并提高了电池效率。此外，还提出了 3D 花状 ZnO@Ag 复合材料的可能生长机制。还详细研究了银含量对 ZnO@Ag 复合材料形成的影响，表明适当的银含量在形成 ZnO@Ag 复合材料的定义的 3D 花状结构方面起着关键作用。
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