Department of Materials and Centre for Nanotechnology, Imperial College London , London SW7 2AZ, U.K.
ACS Appl Mater Interfaces. 2017 Nov 1;9(43):37823-37831. doi: 10.1021/acsami.7b12661. Epub 2017 Oct 23.
The lithium storage properties of the distorted metal-organic framework-derived nanosized ZnO@C are significantly improved by the introduction of AgS quantum dots (QDs) during the processing of the material. In the thermal treatment, the AgS QDs react to produce Ag nanoparticles and ZnS. The metal nanoparticles act to shorten electron pathways and improve the connectivity of the matrix, and the partial sulfidation of the ZnO surface improves the cycling stability of the material. The electrochemical properties of ZnO@C, AgS QDs-treated ZnO@C, and the amorphous carbon in ZnO@C have been compared. The small weight ratio of AgS QDs to ZnO@C at 1:180 shows the best performance in lithium storage. The exhibited specific capacities are improved and retained remarkably in the cycling at high current rates. At low current densities (200 mA g), treatment of ZnO@C with AgS QDs results in a 38% increase in the specific capacity.
在材料处理过程中引入 AgS 量子点（QDs）可显著提高扭曲的金属有机骨架衍生的纳米 ZnO@C 的储锂性能。在热处理过程中，AgS QDs 反应生成 Ag 纳米颗粒和 ZnS。金属纳米颗粒缩短了电子路径并提高了基质的连通性，而 ZnO 表面的部分硫化改善了材料的循环稳定性。比较了 ZnO@C、AgS QDs 处理的 ZnO@C 和 ZnO@C 中的无定形碳的电化学性能。在 1:180 的小重量比下，AgS QDs 对 ZnO@C 的处理在高电流速率下的储锂性能最佳。在低电流密度（200 mA g）下，用 AgS QDs 处理 ZnO@C 可使比容量提高 38%。
