Zhang Siwen, Yin Bosi, Jiang He, Qu Fengyu, Umar Ahmad, Wu Xiang
Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, Harbin Normal University, Harbin 150025, P. R. China.
Dalton Trans. 2015 Feb 7;44(5):2409-15. doi: 10.1039/c4dt03270e.
Heterostructured ZnO/ZnS nanoforests are prepared through a simple two-step thermal evaporation method at 650 °C and 1300 °C in a tube furnace under the flow of argon gas, respectively. A metal catalyst (Au) to form a binary alloy has been used in the process. The as-obtained ZnO/ZnS products are characterized by using a series of techniques, including scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersion X-ray spectroscopy (EDS), Raman spectroscopy and photoluminescence. A possible growth mechanism is temporarily proposed. The hybrid structures are also directly functionalized as supercapacitor (SC) electrodes without using any ancillary materials such as carbon black or binder. Results show that the as-synthesized ZnO/ZnS heterostructures exhibit a greatly reduced ultraviolet emission and dramatically enhanced green emission compared to pure ZnO nanorods. The SCs data demonstrate high specific capacitance of 217 mF cm(-2) at 1 mA cm(-2) and excellent cyclic performance with 82% capacity retention after 2000 cycles at a current density of 2.0 mA cm(-2).
通过简单的两步热蒸发法，分别在650℃和1300℃的管式炉中，于氩气气流下制备了异质结构的ZnO/ZnS纳米森林。该过程中使用了一种金属催化剂（Au）以形成二元合金。通过一系列技术对所制备的ZnO/ZnS产物进行了表征，包括扫描电子显微镜（SEM）、X射线衍射（XRD）、能量色散X射线光谱（EDS）、拉曼光谱和光致发光。暂时提出了一种可能的生长机制。这些混合结构还被直接用作超级电容器（SC）电极，无需使用任何辅助材料，如炭黑或粘结剂。结果表明，与纯ZnO纳米棒相比，所合成的ZnO/ZnS异质结构的紫外发射大大降低，绿色发射显著增强。超级电容器数据表明，在1 mA cm(-2)时具有217 mF cm(-2)的高比电容，在2.0 mA cm(-2)的电流密度下循环2000次后具有82%的容量保持率，循环性能优异。
