Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 284, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2022.126059
Keywords
Manganese selenide; Hydrothermal synthesis; Faradaic reactions; Graphene; Asymmetric supercapacitor
Categories
Funding
- Higher Education Commission, Pakistan (NRPU) [9899/Balochistan/NRPU/RD/HEC/2017]
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In this study, a series of MnSe-GO nanocomposites were prepared via a hydrothermal route and the effect of GO content on the electrochemical properties of the composites was investigated. It was found that the 5% GO composite exhibited the best electrochemical performance for supercapacitors and asymmetric supercapacitors.
In this work, series of manganese selenide (MnSe) and graphene oxide (GO) nanocomposites are prepared via a well-known hydrothermal route to investigate the impact of varying content of GO (5, 10, 15, and 20%) on the electrochemical properties of MnSe-GO composites. Phase and structural investigations of the as-prepared samples were carried out by using XRD. SEM analysis showed the successful formation of flakes-like morphology of MnSe wrapped on GO sheets, providing a conductive pathway for transmission of electrolyte ions. When tested thoroughly for supercapacitor electrodes in a three-electrode configuration, all electrodes revealed a pair of redox peaks originating from Mn2+/Mn3+ due to faradaic redox reactions owing to their pseudocapacitive behavior. Amongst all samples, the optimum electrochemical performance was achieved with the aid of 5% GO composite with MnSe, which exhibited a capacitance of 180 F g(-1) with the lowest charge transfer resistance. For practical aspects, we designed and fabricated an asymmetric supercapacitor (ASC), which delivered a capacitance of 56.25 F g(-1), an energy density of 31.25 Wh kg(-1) at a power density of 6779.20 W kg(-1). Remarkably, our fabricated ASC made of MnSe-GO//AC displayed an outstanding cycling performance with its initial capacitance retention of 86.3% when tested for 5000 successive charge-discharge cycles. Thus, based on the comparative results of MnSe based GO composites for energy storage, the performance of the MnSe nanomaterial can be further enhanced by using different carbon-based nanomaterials, a promosing approach to fabricate materials for future energy conversion and storage devices.
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