Abstract
AbstractBoth selenium and reduced graphene oxide have low specific capacitance due to their chemical nature. Nevertheless, their specific capacitance could be enhanced by hybridizing Se nanomaterials with reduced graphene oxide via formation of electrochemical double layer at their interfacial area. Therefore, novel Se-nanorods/rGO nanocomposite was successfully synthesized by template free hot reflux route starting with graphene oxide and selenium dichloride. The composite of rGO decorated by Se-nanorods is characterized using X-ray diffractometry (XRD), Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and nitrogen adsorption– desorption. The unique architecture of the composite exhibits high specific capacitance of 390 F/ g at 5 mV/s scan rate in 1.0 M KOH solution with ~ 90% cyclic stability after 5000 cycles making it very promising electrode material for supercapacitor applications.
Highlights
IntroductionTo overcome some of the limitations of batteries, supercapacitors have been introduced as the generation en-
To overcome some of the limitations of batteries, supercapacitors have been introduced as the generation en-very low capacitance have been observed when graphene is utilized into the electrode film through different techniques, as the graphene layers stacked and aggregated, resulting in reduced chances of electrolyte access to the full surface [17,18,19,20]
Novel Se-nanorods/rGO nanocomposite was successfully synthesized by template free hot reflux route starting with graphene oxide and selenium dichloride
Summary
To overcome some of the limitations of batteries, supercapacitors have been introduced as the generation en-. In the search for suitable electrode materials, selenium, an indirect bandgap semiconductor, is promising candidate [26,27,28]. Selenium containing materials such as MoSe2 [29], NiSe2 [30], CuSe2 [31], WSe2 [32] and MnSe2 [33] are widely used in many applications, due to their proven properties and recent studies revealed that selenium with nanomorphology can enhance capacitive performance [33, 34]. There are no reported investigations on the synthesis and applications of Se-nanorods/rGO nanocomposite for supercapacitor applications. The electrochemical investigation was carried out in 1.0 M KOH solution, due to its low resistivity, low corrosive and poisoning effect along with high stability, high ionic conductivity and mobility of OH− ions compared to acidic electrolytes [35,36,37]
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