Iron Zinc Selenide Binary Metal Nanosheets for Supercapacitors

Abstract

Due to strong conductivity and high electrochemical activity, transition metal selenides (TMSs) have gotten a lot of attention in the field of electrochemical energy storage. TMSs have sufficient energy capacities, outstanding rate capabilities, prolonged and stable life. Introduction of binary metal combination in these materials further enhances their intrinsic conductivity and renders their suitability for electrochemical charge storage. In an effort to produce an economical combination of Binary-Transition Metal Selenides (termed as B-TMSs), herein, we report a simple, straightforward, and thorough technique. Hence, nanosheet like nanostructures of B-TMSs were obtained where iron and zinc are the metallic constituents. The morphological, structural, and surface chemistry of nanosheets have all been well investigated. The electrochemical investigation of (FeZnSe termed as FZSe) nanosheets reveals exceptional performance in supercapacitor application. The FZSe electrode exhibited a particular response due to the synergistic impact of Fe and Zn with a maximum specific capacitance (Csp) of 1140 Fg-1 at a current density of 0.5 Ag-1, cyclic stability of 75%, and coulombic efficiency of 100% over 5000 cycles. Asymmetric supercapacitor made of FZSe nanosheets demonstrated a high-power density of 1440 Wkg-1, energy density of 10.6 Whkg-1, coulombic efficiency of 93%, and capacitance retention of 83.5% over 7000 cycles. Because of its high surface area, nanosheets shape and mixed transition metal selenide synergetic effect, the asymmetric supercapacitor has a lot of potential for practical supercapacitors.