Hetero-structured NiS2/CoS2 nanospheres embedded on N/S co-doped carbon nanocages with ultra-thin nanosheets for hybrid supercapacitors

Featuring high electrical conductivity and electrochemical activity, transition metal sulfides are promising materials for the positive electrode of hybrid supercapacitors. However, considering their poor cycling life rate performance, critical challenges remain. In this contribution, we describe hollow NiS2/CoS2@C composites obtained by stepwise etching, annealing, sulfuration ZIF-67. Specifically, NiS2/CoS2 particles were dispersed on N/S co-doped carbon nanocages found to exhibit outstanding stability performance. The unique nanocage structure heterogeneous interfaces NiS2 CoS2 can promote both ion transport electron transfer, enriching active site enhanced reactivity. resulting in fact showed considerable with a specific capacity 1373 C g-1 at 1 A g-1. When combined reduced graphene oxide (RGO)-based negative electrode, assembled supercapacitor registered an energy density 63.3 Wh kg-1 power 800 W kg-1, retaining exceeding 98% initial even after 13,000 cycles.