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Solvothermal synthesis of Fe3S4@graphene composite electrode materials for energy storage
Karuppasamy Muthumalai,Muthu Dinesh,Haldorai Yuvaraj,Rajendra Kumar Ramasamy Thangavelu 한국탄소학회 2020 Carbon Letters Vol.30 No.6
Necessity of novel energy storage devices extensively increased due to consumption of high power in various devices. To address the issues, in this report, we are addressing with a composite Iron Sulfde/reduced Graphene Oxide (Fe3S4/rGO) synthesized using the standard solvothermal method. X-ray difraction and Field Emission Scanning Electron Microscope analysis results confrmed that Face-Centered cubic crystal structure of Fe3S4 and rGO’s surface is decorated with a mean diameter of <50 nm Fe3S4 respectively. Transmission Electron Microscopy images show further evidence that dispersed Fe3S4 on the rGO surface. Fe3S4/rGO exhibits specifc capacitance of 560 F/g than its individual counterparts (Fe3S4=200 F/g and rGO=145 F/g) at 1 A/g of current density and maximum cyclic stability of 91% capacitance retention after 2000 cycles that may be the infuence of synergy between the composite materials.
Vargheese Stella,Dinesh Muthu,Kavya K. V.,Pattappan Dhanaprabhu,Rajendra Kumar Ramasamy Thangavelu,Haldorai Yuvaraj 한국탄소학회 2021 Carbon Letters Vol.31 No.5
Doped porous carbon materials have attracted great interest owing to their excellent electrochemical performance toward energy storage applications. In this report, we described the synthesis of nitrogen-doped porous carbon (N-PC) via carbonization of a triazine-based covalent organic framework (COF) synthesized by Friedel–Crafts reaction. The as-synthesized COF and N-PC were confrmed by X-ray difraction. The N-PC exhibited many merits including high surface area (711 m2 g−1), porosity, uniform pore size, and surface wettability due to the heteroatom-containing lone pair of electron. The N-PC showed a high specifc capacitance of 112 F g−1 at a current density of 1.0 A g−1 and excellent cyclic stability with 10.6% capacitance loss after 5000 cycles at a current density of 2.0 A g−1. These results revealed that the COF materials are desirable for future research on energy storage devices.
Kavya K. V.,Muthu Dinesh,Varghese Stella,Pattappan Dhanaprabhu,Kumar R. T. Rajendra,Haldorai Yuvaraj 한국탄소학회 2022 Carbon Letters Vol.32 No.6
In this work, a nanocomposite containing gold (Au) nanofibers decorated iron-metal–organic framework (Fe-MOF) was successfully synthesized for electrochemical detection of acetaminophen (AAP). The as-synthesized Au@Fe-MOF nanocomposite was confirmed by various characterization techniques. Morphological analysis showed that the Au nanofibers with an average size of less than 10 nm were dispersed on the Fe-MOF. Cyclic voltammetric analysis showed that the Au@Fe-MOF nanocomposite showed well-defined redox peaks with higher current than that of GCE and Fe-MOF. The Au@Fe-MOF/GCE exhibited a linear range, sensitivity, and detection limit of 0.5–18 µM, 4.95 µM/µA/cm2, and 0.12 µM, respectively. The Au@Fe-MOF/GCE showed a very low response for the interference materials. The real sample analysis revealed that the Au@Fe-MOF/GCE showed good recovery towards the AAP in urine and paracetamol. Therefore, the developed sensor can be used for quality control of AAP.