Construction of bimetallic ZnSe–CoSe ₂ flower as a finely tuned electrode for enhancing supercapacitor performance

Abstract

The widespread demand in satisfying human desires entails huge energy consumption. In response, potential impact toward the energy storage tool plays an essential role in constant energy supply. In this work, bimetallic ZnSe-CoSe 2 electrode material was designed owing to its low pollution, high chemical stability, and theoretical capacity for supercapacitor applications. The basic characterization confirmed the formation of structural, morphological, and phase purity of the as prepared composite. The prologue of agglomerated CoSe 2 microcubes into ZnSe pyramidal structure and synergetic effect of the individual component comprises multifunctionalities during redox progression attributable to greater structural potency. The rigid contact stuck between pyramidal structured ZnSe and CoSe 2 agglomerated microcubes favors the regular contact with the electrolyte for prompt ion diffusion. These fine advantageous properties notably endows with greater charge storage progression demonstrating the active construction of ZnSe-CoSe 2 heterostructures. The prepared product delivered 645 Fg À1 specific capacitance at 1Ag À1 in half cell configuration and exhibited the capacity retention of 99.6% at 10Ag À1 , retained over 5000 cycles. In addition, the assembled full cell showed 57 Whkg À1 energy density at 743 Wkg À1 power density and opens up a new way to access the progress of high performance supercapacitor with specific capacitance of 184 Fg À1 and retaining long life span of 93.3% at 10 Ag À1 after 5000 cycles. Finally, two cells in series owns a high working potential of 1.92 V and effectively burn up light emitting diode (LED) indicating their potential function in energy storage device.