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Well-defined NiSe@ZnSe composite electrode was synthesized along with polyvinyl pyrrolidone (PVP) and sodium lauryl sulfate (SLS) surfactant whose redox behavior is an interesting approach toward boosting performance of the supercapacitor. High crystallinity suggested that prepared composite NiSe@ZnSe was well appropriate for the application concerning the supercapacitor electrode material. The Raman spectroscopy identified the functional group, vibrations, stretching of bonds, and presence of defects in the samples. The surface to volume ratio of the loosely packed grass-like structures resulted in availability of more surface area for the electrolyte which leads to the enhanced reaction rates. As-prepared active synthesized product revealed 442 Fg−1 specific capacitance at 1 Ag−1 with 99.3% high-rate capability at 10 Ag−1 after 2000 cycles. Besides, notably, capacity retention of the sandwiched asymmetric NiSe@ZnSe//AC device was maintained to be 99.48% after constant charge−discharge 2000 cycles and displayed outstanding electrochemical stability. Herein, NiSe@ZnSe composite electrode was prepared because Zn could improve the electrical conductivity and capacitive performance. Ni can improve active site density and conductivity. Meanwhile, selenium enhanced charge transfer properties. Therefore, binary composite NiSe@ZnSe acts as a satisfactory electrode material for energy saving application. [ABSTRACT FROM AUTHOR]

Active electrodes of transition metal selenides attract extensive consideration in energy storage application because of its improved electrochemical performances. In this study, evolution of flower like MnSe2@MoSe2 was subsequently synthesized through one pot hydrothermal route. Growth of combined composite exposed flowerlike morphology with looser corrugated nanospikes increases surface area for redox reaction which reduces ionic diffusion pathway and improves supercapacitor performance in three-cell configurations. The best performed (MMS-3) electrode exhibited 719 Fg−1 specific capacitance and retained 99.78% capacity retention over 2000 cycles. Furthermore, as an asymmetric MnSe2@MoSe2//AC device delivered significant 75 Whkg−1 energy density at 747 Wkg−1 power density. Besides, asymmetric (MMS-3)//AC device maintained 99.16% capacity retention after constant 2000 charge discharge cycles. In a small-scale practical demonstration, MnSe2@MoSe2//AC device illuminated red LED and displayed improved electrochemical performance. Hence, both Mn (manganese) and Mo (molybdenum) mutual role promotes more affluent redox chemistry, which is beneficial for higher electrochemical activity. Thereby, Se provided greater number of electroactive sites that can aid maximum utilization of electrolyte ions. [ABSTRACT FROM AUTHOR]

Metal selenides of were synthesized for various weight percentage of Mn (0.05, 0.1, and 0.15 wt %). MnSe 2 -CoSe 2 emerged as the novel-energy storing material for the supercapacitor application and guaranteed the improved electrochemical performance in asymmetric configuration. As prepared metal selenide composite was explored for standard characterization studies. XRD reveals the highly crystalline in nature of the as prepared samples. Se bonding with Mn-Co is confirmed from the sharp peak obtained at 470 cm−1. The chemical elemental composition was evaluated by the XPS, hence the characterization outcome confirm the successful growth of the material. The specific capacitance of Mn3 (0.15 wt %) is 373 Fg-1 in 1 M KOH; Mn1 (0.05 wt %-184 Fg-1) and Mn2 (0.1 wt %-295 Fg-1). The electrode shows excellent capacity retention of 95.86% at 5 Ag-1 even after 5000 cycles. Furthermore, asymmetric configuration of Mn3 (0.15 wt %)//AC device delivered significant value of power density even at high energy density. Thus, the as-prepared asymmetric device easily illumines the green light emitting diode which indicates the Mn3 (0.15 wt %) is an acceptable product. [ABSTRACT FROM AUTHOR]