High performance supercapacitors based on samarium molybdate/nitrogen and phosphorous co-doped reduced graphene oxide el
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High performance supercapacitors based on samarium molybdate/nitrogen and phosphorous co-doped reduced graphene oxide electrodes Sajad Heidari Fathabad1 and Abdollah Yari1,* 1
Department of Analytical Chemistry, Lorestan University, 6815134416 Khorramabad, Iran
Received: 22 August 2020
ABSTRACT
Accepted: 9 October 2020
Nanocomposites produced with samarium(III) molybdate/N, P co-doped reduced graphene oxide (Sm2MoO6/NPRGO) combination may be very useful in the field of supercapacitors due to the active interaction between these two components. In this study, we used the sonochemical method, which is quite simple and cheap, to produce Sm2MoO6/NPRGO nanocomposite, which draws attention with its high-quality electrochemical performance. Surface and structural properties of Sm2MoO6 nanoparticles, NPRGO and Sm2MoO6/NPRGO nanocomposite structures were studied by X-ray photoemission spectroscopy (XPS), nitrogen adsorption/desorption studies, scanning electron microscopy, and X-ray diffraction analysis. The symmetric supercapacitive performance of the Sm2MoO6/NPRGO electrode exhibits a specific capacitance of 689 F g-1 (at 2 mV s-1) and could maintain 99.9% capacity after 4000 charge–discharge cycles. Additionally, the symmetric supercapacitors based on nanocomposite electrode demonstrate a high energy density (23.2 W h kg-1 at 250 W kg-1), outstanding power density (8000 W kg-1 at 14.4 W h kg-1). Generally, this nanocomposite was synthesized for the first time and its supercapacitive properties were investigated. The nanocomposite electrode exhibited good supercapacitor response, remarkable rate performance and excellent cycling stability in both 0.5 M Na2SO4 electrolyte.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction Electrochemical supercapacitors are one of the most important energy storage equipment between conventional capacitors and batteries throughout the last decade [1–3]. They store or release a large amount of energy in a small time. Hybrid electric vehicles, fuel
cell vehicles, trains, trolleybuses, UPS and volatile memory backups in PCs use this device in their structure [4, 5]. Electroactive materials for supercapacitors are critically important to obtain higher electrochemical performance of the devices [6]. Based on the active material of the electrodes, supercapacitors are divided into three categories: electric double
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https://doi.org/10.1007/s10854-020-04648-1
J Mater Sci: Mater Electron
layer (EDLC) electrodes, pseudocapacitors and hybrid supercapacitors [7]. The charge storage mechanism in EDLCs is non-Faradic and in pseudocapacitors is Faradic. In hybrid supercapacitors, both faradic and non-faradic mechanisms are involved in load storage [8]. Various materials are used to pseudocapacitors electrodes, such as conducting polymers (polythiophene [9] and polyaniline [10]) and metal oxides (manganese (IV) oxide [11], ruthenium oxide [12] and titanium dioxide [13]). Carbonaceous materials
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