MOF-derived hierarchical double-shelled NiO/ZnO hollow spheres for high-performance supercapacitors

作者：Guochang Li, Pengfei Liu, Rui Liu, Minmin Liu, Kai Tao, Shuairu Zhu, Mengke Wu, Fei‐Yan Yi, Lei Han · 发表于：Dalton Transactions · 年份：2016 · DOI：10.1039/c6dt01791f · 被引用次数：212 · 研究领域：Supercapacitor Materials and Fabrication、Copper-based nanomaterials and applications、Advancements in Battery Materials

Nanorods-composed yolk-shell bimetallic-organic frameworks microspheres are successfully synthesized by a one-step solvothermal method in the absence of any template or surfactant. Furthermore, hierarchical double-shelled NiO/ZnO hollow spheres are obtained by calcination of the bimetallic organic frameworks in air. The NiO/ZnO hollow spheres, as supercapacitor electrodes, exhibit high capacitance of 497 F g(-1) at the current density of 1.3 A g(-1) and present a superior cycling stability. The superior electrochemical performance is believed to come from the unique double-shelled NiO/ZnO hollow structures, which offer free space to accommodate the volume change during the ion insertion and desertion processes, as well as provide rich electroactive sites for the electrochemical reactions.