Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen, 361005, China.
Sci Rep. 2017 Aug 29;7(1):9657. doi: 10.1038/s41598-017-08773-6.
Ag-FeO hollow spheres are synthesized by using Ag@C core-shell matrix as sacrificial templates. The morphologies and structures of the as-prepared samples are characterized by scanning electron microscopy, X-ray powder diffraction energy dispersive, transmission electron microscopy and high resolution transmission electron microscopy. In contrast to FeO hollow spheres, Ag-FeO hollow spheres exhibit much higher electrochemical performances. The Ag-FeO composites exhibit an initial discharge capacity of 1030.9 mA h g and retain a high capacity of 953.2 mA h g at a current density of 100 mA g after 200 cycles. Furthermore, Ag-FeO electrode can maintain a stable capacity of 678 mA h g at 1 A g after 250 cycles. Rate performance of Ag-FeO electrode exhibits a high capacity of 650.8 mA h g even at 5 A g. These excellent performances can be attributed to the decoration of Ag particles which will enhance conductivity and accelerate electrochemical reaction kinetics. Moreover, the hollow structure and the constructing particles with nanosize will benefit to accommodate huge volume change and stabilize the structure.
Ag-FeO 空心球是通过使用 Ag@C 核壳作为牺牲模板合成的。采用扫描电子显微镜、X 射线粉末衍射能谱、透射电子显微镜和高分辨率透射电子显微镜对所制备的样品进行了形貌和结构的表征。与 FeO 空心球相比，Ag-FeO 空心球表现出更高的电化学性能。Ag-FeO 复合材料在 100 mA g 的电流密度下，经过 200 次循环后，初始放电容量为 1030.9 mA h g，可保持 953.2 mA h g 的高容量。此外，Ag-FeO 电极在 250 次循环后，在 1 A g 时可保持稳定的容量为 678 mA h g。Ag-FeO 电极的倍率性能在 5 A g 时仍具有 650.8 mA h g 的高容量。这些优异的性能可归因于 Ag 颗粒的修饰，这将提高导电性并加速电化学反应动力学。此外，空心结构和纳米尺寸的构建颗粒有利于容纳巨大的体积变化并稳定结构。
