Construction of few layered metallic MoS2 microspheres using glucose induced carbon spheres and its application in symmetric supercapacitor device

• Published in: Journal of electroanalytical chemistry (Lausanne, Switzerland) Vol. 874; p. 114461
• Main Authors: Joseph, Nikhitha, A., Chandra Bose
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.10.2020; Elsevier Science Ltd
• Subjects: 2D metallic MoS2; Carbon; Carbon sphere; Charge transfer; Cycle stability; Discharge; Electrode materials; Electrodes; Energy storage; Flux density; Microspheres; Molybdenum disulfide; Nanostructure; Specific energy and power; Supercapacitor; Supercapacitor; Cycle stability; 2D metallic MoS2; Specific energy and power; Carbon sphere
• ISSN: 1572-6657; 1873-2569
• DOI: 10.1016/j.jelechem.2020.114461

Metallic molybdenum disulfide microspheres are constructed by successful growth of ultrathin 1 T-MoS2 nanosheets over carbon spheres in a controlled manner, as a framework to provide large electrochemically active sites. The developed metallic 1 T-MoS2/carbon microspheres enhance the electrochemical energy storage efficiency, where the carbon acts as a conductive backbone to the structure and facilitates smooth charge transfer kinetics during charge-discharge. The reduced number of layers on the 1 T-MoS2/carbon microspheres obviously decreases the restacking tendency of individual MoS2 nanosheets, which in turn reduces the degree of agglomeration. Here, the microsphere electrode material exhibits a high specific capacity (capacitance) of 346C/g (692 F/g) at a specific current of 1 A/g in three-electrode studies. The electrode maintains high capacity retention of 50% when there is a 10 fold increment in the current. The practicability of the electrode material is tested by designing a two-electrode symmetric device, and which delivers a high energy density of 46 Wh/kg with a power density of 775 W/kg. This symmetric cell provides 87% capacity retention over 20,000 charge/discharge cycles, implying its high stability. This nano-architecture promises a new strategy for synthesizing efficient metallic MoS2 based electrode materials for energy storage applications. [Display omitted] •1T-MoS2 microsphere is constructed using carbon sphere templates to control the layer number and reduce self-restacking.•Microsphere morphology allows the easier accessibility of electrolyte ions and improves the charge transfer kinetics.•Conductive carbon sphere provide high structural stability, which in turn to high cyclic stability•Symmetric supercapacitor device delivered high specific energy and power of 46 Wh/kg and 775 W/kg respectively.•Symmetric supercapacitor device delivered high specific energy and power of 46 Wh/kg and 775 W/kg respectively.•Practical applicability of the prepared device is ensured with various colored LED performances.