Hierarchical FeS2 nanosheet@Fe2O3 nanosphere heterostructure as promising electrode material for supercapacitors

• FeS2 nanosheet@Fe2O3 nanosphere heterostructure was prepared by hydrothermal method.
• The FeS2@Fe2O3 hybrid electrode exhibits superior supercapacitive performance.
• The hybrid electrode design is effective to improve the electrochemical performance.

A hierarchical heterostructure of Fe2O3 nanospheres anchored on FeS2 nanosheets has been synthesized by a one-step hydrothermal treatment and investigated as electrode material for supercapacitors. The FeS2@Fe2O3 hybrid electrode shows superior supercapacitive performance compared to the bare Fe2O3 electrode, demonstrating a large specific capacitance of 255 F g−1 as well as good rate capability (145 F g−1 at a current density of 8 A g−1) and cycle performance (90% capacitance retention after 5000 cycles).