Yunnan Province Key Lab of Micro-Nano Materials and Technology, Yunnan University, 650091 Kunming, People's Republic of China.
School of Materials Science and Engineering, Yunnan University, 650091 Kunming, People's Republic of China.
Sci Rep. 2017 Jan 6;7:40167. doi: 10.1038/srep40167.
Carbon sphere (CS)@ZnO core-shell nanocomposites were successfully prepared through facile low-temperature water-bath method without annealing treatment. The morphology and the microstructure of samples were characterized by transition electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), respectively. ZnO nanoparticles with several nanometers in size decorated on the surface of the carbon sphere and formed a core-shell structure. Electrochemical performances of the CS@ZnO core-shell nanocomposites electrodes were investigated by cyclic voltammetry (CV) and galvanostatic charge/discharge (GDC). The CS@ZnO core-shell nanocomposite electrodes exhibit much larger specific capacitance and cycling stability is improved significantly compared with pure ZnO electrode. The CS@ZnO core-shell nanocomposite with mole ratio of 1:1 achieves a specific capacitance of 630 F g at the current density of 2 A g. Present work might provide a new route for fabricating carbon sphere and transition metal oxides composite materials as electrodes for the application in supercapacitors.
碳球（CS）@氧化锌核壳纳米复合材料通过简便的低温水浴法制备，无需退火处理。通过透射电子显微镜（TEM）、X 射线衍射（XRD）和 X 射线光电子能谱（XPS）分别对样品的形貌和微观结构进行了表征。尺寸为几纳米的氧化锌纳米粒子修饰在碳球表面，形成核壳结构。通过循环伏安法（CV）和恒流充放电（GDC）研究了 CS@ZnO 核壳纳米复合材料电极的电化学性能。与纯 ZnO 电极相比，CS@ZnO 核壳纳米复合材料电极具有更大的比电容和显著提高的循环稳定性。摩尔比为 1:1 的 CS@ZnO 核壳纳米复合材料在 2 A/g 的电流密度下具有 630 F/g 的比电容。本工作为制备碳球和过渡金属氧化物复合材料作为超级电容器应用的电极提供了一条新途径。
