Hydrothermal synthesis of ZnO@ZnS heterostructure on Ni foam: A binder free electrode for high power and stable hybrid supercapacitors

A simple hydrothermal technique was applied to synthesize ZnO@ZnS nanocomposite for hybrid supercapacitors (SCs). As an electrode for SCs, ZnO@ZnS revealed good reversibility, a capacitance of 440.6 F/g, and low charge transfer resistance in an aqueous solution. A hybrid SC was further developed, which delivers a high energy density of 31 Wh kg- 1, a power density of 4520 W kg- 1, and supreme stability of 94.7 % till 5500 repeated charge-discharge cycles. These exciting findings demonstrate that ZnO-based functional materials might be an excellent option for high-performance hybrid SCs.

Automated summary

ZnO@ZnS nanocomposite was synthesized using a simple hydrothermal technique for the electrode of hybrid supercapacitors. The material showed good reversibility, low charge transfer resistance, and high capacitance. A hybrid supercapacitor was developed with high energy and power density, and excellent stability after repeated charge-discharge cycles.