Formation of mixed metal sulfides of NixCu1−xCo2S4 for high-performance supercapacitors
作者： Wenqiang Chen , Pengwei Yuan , Songhao Guo , Suqin Gao , Jiao Wang
DOI: 10.1016/J.JELECHEM.2019.02.003
关键词: Solid solution 、 Crystal structure 、 Electrochemistry 、 Chemistry 、 Microstructure 、 Metal 、 Crystallinity 、 Chemical engineering 、 Crystal 、 Supercapacitor
摘要: Abstract A series of mixed metal sulfides NixCu1−xCo2S4 were synthesized by a facile two-step hydrothermal method and they investigated as electrode materials for supercapacitor. substitutional solid solution can be easily formed due to the same atom occupation similar crystal radius Ni Cu in sulfides. The electrochemical performances are strongly influenced chemical compositions, though have structure. Among all as-prepared materials, Ni0.67Cu0.33Co2S4 shows best with highest specific capacitance 1340.48 F g−1 at 1 g−1, outstanding rate capability excellent cycling stability. improved attributed high crystallinity, modified microstructure, increased sites electroconductivity caused lattice distortion well synergistic effect Cu-substituted NiCo2S4. Furthermore, assembled two-electrode hybrid device Ni0.67Cu0.33Co2S4//activated carbon deliver energy density 40 Wh kg−1 power 412.5 W kg−1, showing great potential storage.
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