Effect of isoelectronic tungsten doping on MOLYBDENUM SELENIDE (cas 12058-18-3) nanostructures and their graphene hybrids for supercapacitors

Add time:07/27/2019    Source:sciencedirect.com

Electrochemical supercapacitors are vital for the advancement of energy storage devices. Herein, we report the synthesis of MOLYBDENUM SELENIDE (cas 12058-18-3) (MoSe2), tungsten-doped molybdenum selenide (WMoSe2) and their graphene (G) composites (WMoSe2/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, MoSe2 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.

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