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Fabrication of Ultrathin rGO Sheet-Wrapped Mixed-Phase MnSe2/CoSe2 Nanocomposite for High-Performance Supercapacitor Electrodes with Long-Term Stability
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Fabrication of Ultrathin rGO Sheet-Wrapped Mixed-Phase MnSe2/CoSe2 Nanocomposite for High-Performance Supercapacitor Electrodes with Long-Term Stability
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Fabrication of Ultrathin rGO Sheet-Wrapped Mixed-Phase MnSe2/CoSe2 Nanocomposite for High-Performance Supercapacitor Electrodes with Long-Term Stability
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Journal Article
Fabrication of Ultrathin rGO Sheet-Wrapped Mixed-Phase MnSe2/CoSe2 Nanocomposite for High-Performance Supercapacitor Electrodes with Long-Term Stability
2024
Overview
Binary transition metal chalcogenides and reduced graphene oxide exhibit significant potential for energy storage devices due to their superior electronic conductivity and capacity, surpassing that of single-metal sulfides, owing to their more extensive redox reactions. In this report, we introduce a novel synthesis method for producing a mixed-phase MnSe2/CoSe2 nanocomposite wrapped with reduced graphene oxide (rGO) sheets, designed specifically for supercapacitor applications. The MnSe2/CoSe2 hybrid material was synthesized using an ultrasonic assisted hydrothermal technique, followed by the preparation of the rGO/MnSe2/CoSe2 hybrid composite. The structural characterization was conducted employing x-ray diffraction (XRD), scanning electron microscopy (SEM), x-ray photoelectron spectroscopy (XPS) and Raman techniques. Brunauer–Emmett–Teller (BET) analysis demonstrated a significant specific surface area (66.5 m2/g) and a pore size distribution of 28.4 nm in rGO-MnSe2/CoSe2. The interconnected ultrathin rGO nanosheets and conductive carbon layer contributed to the exceptional conductivity and stability achieved by the rGO/MnSe2/CoSe2 composite electrode. The electrochemical performance was assessed using a three-electrode setup in a 3 M KOH solution, with nickel foam as the current collector. The working electrode, consisting of rGO/MnSe2/CoSe2, acetylene black and PVDF in an 80:15:5 weight ratio, demonstrated specific capacitance of 1214 F g−1 and cycling stability of 88% retention after 5000 cycles at 1 A g−1. An asymmetric supercapacitor, constructed using a tailored electrode composition, achieved energy density of 28.6 Wh kg−1 at 2100 W kg−1 and high power density of 888 W kg−1 at 49.7 Wh kg−1.
Publisher
Springer Nature B.V
Subject
/ Graphene
