Bhat, K.S.Nagaraja, H.S.2026-02-052019Electrochimica Acta, 2019, 302, , pp. 459-471134686https://doi.org/10.1016/j.electacta.2019.02.059https://idr.nitk.ac.in/handle/123456789/24603Electrochemical supercapacitors are vital for the advancement of energy storage devices. Herein, we report the synthesis of molybdenum selenide (MoSe <inf>2</inf> ), tungsten-doped molybdenum selenide (W–MoSe <inf>2</inf> ) and their graphene (G) composites (W–MoSe <inf>2</inf> /G) via a facile hydrothermal method. Physiochemical properties of the as-synthesized samples are examined using X-ray diffraction, Raman spectroscopy, thermogravimetric analysis, X-ray photoelectron spectroscopy, Brunauer–Emmett–Teller measurements, scanning electron microscopy, high resolution transmission electron microscopy and energy dispersive X-ray spectroscopy measurements. Used as working electrodes for supercapacitors, MoSe <inf>2</inf> nanostructures could deliver the specific capacitance of 106 F g ?1 at 2 mV s ?1 scan rate. Further, doping with tungsten (W) demonstrates the variation of specific capacitances with 2 M % of tungsten as the optimum doping amount, delivering the maximum specific capacitance of 147 F g ?1 . Furthermore, graphene composites of these nanostructures deliver the enhanced specific capacitances of 248 F g ?1 and complimented with excellent capacitance retention capability of 102% for 20000 cycles. © 2019 Elsevier LtdCapacitanceEnergy dispersive spectroscopyGrapheneHigh resolution transmission electron microscopyHydrothermal synthesisNanoflowersNanostructuresScanning electron microscopySelenium compoundsSupercapacitorThermogravimetric analysisTungsten compoundsX ray photoelectron spectroscopyCapacitance retentionElectrochemical supercapacitorEnergy dispersive X ray spectroscopyHydrothermal methodsPhysio-chemical propertiesSelenidesSpecific capacitanceTungsten dopingMolybdenum compounds