三维多级纳米结构 CoNi2S4的构筑及其超级电容性能.

In view of the low specific capacitance and rate performance of supercapacitor electrode materials, the idea of constructing three-dimensional (3D) hierarchical nanostructured electrode materials is proposed to provide more active sites for electrochemical reactions. Taking transition bimetallic CoNi2S4 as the research object, the electrode material with 3D hierarchical nanostructure was formed by self-assembly under the condition of introducing structure directing agent and two-step hydrothermal method. The structure consists of countless nanofibers interwoven from the inner core to the outer surface, forming stable nanospheres with a diameter of about 2 µm. The 3D hierarchical nanostructure exhibited a specific surface area of 22. 9 m²/g and distributed nanopores with pore sizes ranging from 5-20 nm. When used as a supercapacitor electrode material. the CoNi2S4 material exhibited a specific capacitance of 1 299. 4 F/g. Even at an ultra-high current density of 50 A/g. the specific capacitance of the electrode material could still retain 23. 8%, showing its excellent specific capacitance and rate performance. [ABSTRACT FROM AUTHOR]