Synthesis and characterization of bimetallic selenides/carbon nanocomposite for the electrochemical sensor and energy storage applications
| Autor: | Mani Sakthivel |
|---|---|
| Rok vydání: | 2018 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 106 The intensive research has been exploited to improve the electrocatalytic performance of selenide based chalcogenide. For this thing, the different strategies have been developed and followed such as (i) increased the active sites by cation-doping/substitution, which introduce the defect or strain on the basal planes of two dimensional layered metal selenide, and (ii) hybridization of carbonaceous materials, which act as an excellent catalyst support to improve both electrocatalytic activity and electrical conductivity. Encouraged by these studies, we have prepared NiCoSe2, CoFeSe2/f-CNF, SmMoSe2@GO, EuMoSe2, and SrMoSe2 in different nanostructures by using the simple hydrothermal method and characterized by various analytical techniques. Furthermore, the prepared bimetallic selenides and their nanocomposite have been developed as the efficient electrode materials for electrochemical sensor and energy storage applications. (i) For the first time, the bimetallic NiCoSe2 modified glassy carbon electrode was used for the detection of H2O2 and compared to that obtained at NiCo2S4 and NiCo2O4 modified electrode. The all followed electrochemical studies show that the NiCoSe2 modified electrode exhibits better electrochemical performance towards the detection of H2O2 than that of NiCo2S4 and NiCo2O4. In addition, the excellent specific capacitance of NiCoSe2 electrode was detected and compared to that obtained at NiCo2S4 and NiCo2O4 electrode. (ii) The bimetallic cobalt-iron diselenide nanosphere entrapped functionalized carbon nanofiber (CoFeSe2/f-CNF) composite has been used as an electrode material for efficient electrochemical detection of caffeic acid (CA) in wine sample. The f-CNF greatly supports to enhance the electrocatalytic activity of the nanocomposite due to the interesting cylindrical nanostructure with stacking arrangement of graphene sheets, more edge plane defects on outer wall offer efficient electron transfer. (iii) The GO encapsulated SmMoSe2 nanocomposite modified GCE (GO@SmMoSe2/GCE) was used for the electrochemical detection of chloramphenicol (CAP). It is evidently proved that the substitution/doping of Sm3+ creates the distortion into the plane of MoSe2 and consequently increases the active sites (edge and terrace sites) for the effective electrocatalytic activity. In addition, GO is a well-known derivative of graphene, also have a large surface area, high electronic conductivity and mechanical strength due to the presence of the number of structural defects and functional groups (epoxy, hydroxyl, and carbonyl) on basal plane and edges. Thus, both the substitution of Sm3+ and hybridization of GO significantly improve the electrocatalytic activity of MoSe2 towards the detection of CAP. (iv) The follower like Eu doped/substituted MoSe2 nanoflower (EuMoSe2) was developed as an active electrode material for the electrochemical detection of diphenylamine (DPA). the EuMoSe2 modified glassy carbon electrode (EuMoSe2/GCE) exhibited an excellent electrocatalytic activity for the detection of DPA with a low detection limit, which is strongly related to the calculated low charge transfer resistance, excellent active surface area, and charge transfer coefficient of the modified electrode. (v) The two-dimensional strontium doped molybdenum diselenide (SrMoSe2) nanosheets have been developed for the electrochemical detection of antimicrobial metronidazole (MTZ) drug. The estimated electrochemical parameters strongly confirmed that the substitution/doping of Sr with 2D layered MoSe2 enhances the electrocatalytic activity towards the sensing of MTZ. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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