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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]

The arrays of nanorods decorated with nanosphere blended by hydrothermal route were reported. The high surface area and open geometry sandwiched between nanorods let easier for electrolyte diffusion and hence affords more electroactive sites. The surface and structural properties were consequently defined by standard characterization analysis. To review the properties of binary composite nanorods designed for supercapacitor application, it scanned experimentally through standard electrochemical analysis. While increasing stoichiometric molar ratio of the active electrode, the specific capacitance increased obviously is depicted as 1:1 (200 Fg−1), 2:1 (281 Fg−1) and 3:1 (509 Fg−1) and the composite electrode retains 99.82% of retention over 2000 cycles. Besides, as an asymmetric device with improved energy density was build up effectively by CMS-3 nanorod as positive and activated carbon as negative electrode and achieved 113 WhKg−1 energy density at 1 Ag−1 with 98.1% stability in 2000 cycles. The practical demonstration of asymmetric device has been tested and simply energizes the red light-emitting diode (LED). As per the above discussion, the improved activity of CuSe2@MoSe2 was because of Cu and Mo inclusion with selenium further progress its conductivity, well-retained surface morphology and high reversibility. Consequently, the good contact between them ensured the smooth transportation of electrons without any obstacles. Hence, the synergetic effect affords the way for immense development of the binary composite for hopeful future. [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]

Transition metal selenide has been considered as an effective electroactive products. A Cu2Se–CoSe product structural and morphological feature was described. The role of temperature induced the sharp crystalline nature which enhanced the electrochemical performance of the prepared active electrode. The prepared product functional, vibrations, stretching and defects were identified. Compactly packed nanograin showed a highly porous nature and resulted enhancement in pseudocapacitive behavior achieved via reversible redox property and intrinsic conductivity. Hence, the active electrode exhibited the improved 1012 Fg−1 capacitance at 1 Ag−1 and long cycle life stability (97.1% capacity retention, 5000 cycles). The fabricated asymmetric device exhibited a prominent reversible discharge performance of 89.4% after consecutive 5000 cycles. Additionally, the practical application demonstration was also verified by energizing LED. Satisfactorily, the progress of the active material led to excellent stability and enhanced energy storage mechanism. [ABSTRACT FROM AUTHOR]

Correction to: Applied Nanoscience (2021) 11:1881-1888 https://doi.org/10.1007/s13204-021-018... In the online publication article, the author "Dhayalan Velauthapillai" affiliation was published incorrectly. The original article can be found online at https://doi.org/10.1007/s13204-021-01890-9. Correction to: Hydrothermal synthesis of Cu2Se-CoSe nanograin for electrochemical supercapacitor applications. [Extracted from the article]