Hydrothermally synthesized ZnSe@FeSe nanocomposite: A promising candidate for energy storage devices.

Currently, the entire world is confronted with two major challenges such as a dearth of energy resources and a progressively deteriorating state of the environment. The significance of generating and storing ecologically sustainable energy has grown in prominence due to the depletion of non-renewable resources. Pseudocapacitors have attracted the attention of energy specialists because of their enhanced cyclic life and increased energy/power density. The current study involved the synthesis of ZnSe@FeSe nanocomposite by hydrothermal technique, with the aim of exploring its potential applications in supercapacitors. Multiple analytical approaches were used to examine the morphology, structure and texture of electrode material. Electrochemical experiments revealed that ZnSe@FeSe electrode showed a higher specific capacitance (C s) of 1419.8 F g−1, high energy density (E d) of 63.2 Wh kg−1, high power density (P d) of 283.2 W kg−1, and long cyclic stability over 5000th CV cycles as compared to ZnSe and FeSe electrodes in 2.0 M KOH. This study highlights the efficiency of ZnSe@FeSe nanocomposite developed by using the economic, environment friendly and efficient hydrothermal method, and it can also be used in future energy-related applications like fuel cells, photocatalysis and hydrogen evolution reactions (HER). • Hydrothermal synthesis of ZnSe@FeSe nanocomposite used as energy storage electrode material. • Investigation of the synergistic effect of binary transition metals with selenide nanocomposite for energy storage devices. • ZnSe@FeSe nanocomposite exhibited higher specific capacitance (C s) of 1419.8 F g−1 than individual metal chalcogenides. • The ZnSe@FeSe electrode showed exceptional cyclic stability for up to 5000th cycles of CV analysis. [ABSTRACT FROM AUTHOR]