Lu Wen, Shen Junling, Zhang Peng, Zhong Yijun, Hu Yong, Lou Xiong Wen David
Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Department of Chemistry, Zhejiang Normal University, Jinhua, 321004, P. R. China.
School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore.
Angew Chem Int Ed Engl. 2019 Oct 21;58(43):15441-15447. doi: 10.1002/anie.201907516. Epub 2019 Sep 12.
Hierarchical hollow structures for electrode materials of supercapacitors could enlarge the surface area, accelerate the transport of ions and electrons, and accommodate volume expansion during cycling. Besides, construction of heterostructures would enhance the internal electric fields to regulate the electronic structures. All these features of hierarchical hollow heterostructures are beneficial for promoting the electrochemical properties and stability of electrode materials for high-performance supercapacitors. Herein, CoO/Co-Cu-S hierarchical tubular heterostructures (HTHSs) composed of nanoneedles are prepared by an efficient multi-step approach. The optimized sample exhibits a high specific capacity of 320 mAh g (2300 F g ) at 2.0 A g and outstanding cycling stability with 96.5 % of the initial capacity retained after 5000 cycles at 10 A g . Moreover, an all-solid-state hybrid supercapacitor (HSC) constructed with the CoO/Co-Cu-S and actived carbon shows a stable and high energy density of 90.7 Wh kg at a power density of 800 W kg .
超级电容器电极材料的分级中空结构可以增大表面积，加速离子和电子的传输，并在循环过程中适应体积膨胀。此外，异质结构的构建会增强内部电场以调节电子结构。分级中空异质结构的所有这些特性都有利于提升高性能超级电容器电极材料的电化学性能和稳定性。在此，通过一种高效的多步方法制备了由纳米针组成的CoO/Co-Cu-S分级管状异质结构（HTHSs）。优化后的样品在2.0 A g时表现出320 mAh g（2300 F g）的高比容量，并且在10 A g下经过5000次循环后具有出色的循环稳定性，保留了初始容量的96.5%。此外，用CoO/Co-Cu-S和活性炭构建的全固态混合超级电容器（HSC）在功率密度为800 W kg时显示出90.7 Wh kg的稳定高能量密度。
