Fabrication of S/CoS2/NiS2/PZH composite using hydrothermal technology for high-performance supercapacitors

Transition metal sulfides (TMSs) are favorable as electrode materials for supercapacitors (SCs) because of their high theoretical capacity, low cost, fascinating redox reversibility, electronic conductivity, and reduced charge transfer resistance. However, TMS electrodes suffer from weak compatibility and combination at heterogeneous interfaces, resulting in TMS stripping and electrode capacity degradation during long-term charging/discharging processes. Herein, we used a convenient, feasible, cheap, and environmentally friendly hydrothermal method to grow S/CoS2/NiS(2)in situ on Pien Tze Huang-based porous carbon (PZH) to promote the poor electric conductivity and unsatisfactory cycling stability of TMSs. Furthermore, TMSs can be tightly embedded on the surface of PZH to prevent falling off or collapse during long-term processes and usage. The prepared S/CoS2/NiS2/PZH electrode possessed an excellent specific capacitance of 1159.2 F g(-1) at 0.5 A g(-1), and after 10 000 cycles at 5 A g(-1), the capacitance retention was maintained over 84.6%. This in situ method is promising for the development of stable TMS-based electrodes for supercapacitors.