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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]

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]

The polyhedron-structured NiSe 2 @MoSe 2 (NMS) were magnificently produced through hydrothermal method, which makes the active electrode very effective in accessing the redox active sites in the charge/discharge process in supercapacitor applications. Systematic studies of the structural and morphological features of the unique polyhedron NMS were performed. Laser Raman spectra reported the vibrational and rotational modes of NMS. NMS exhibited a maximum 1000 F g -1 (138.8 mA h g -1 ) specific capacitance at 1 A g -1 and attained a capacity retention of 77.67% for 5000 stable cycles at 10 A g -1 using 1 M KOH as an electrolyte. The well assembled asymmetric supercapacitor NMS hydrolyzed for 18 h//AC demonstrated an outstanding electrochemical performance with an improved 305 F g -1 specific capacitance attained at 1 A g -1 with a good cycle life of 87.35% and a capacity retention of over 5000 cycles. Herein, the combined contribution of both the Ni and Mo ions offers a richer redox chemistry, which is beneficial to a higher electrochemical activity. The experimental results indicate that the NMS electrode could be used as a high-performance electrode., Competing Interests: There are no conflicts to declare., (This journal is © The Royal Society of Chemistry.)