Two Dimensional Transition Metal Chalcogenides and Reduced Graphene Oxide Hybrids for Supercapacitor and Field Emission Applications

תמונה_סמינרים
09.06.2016
14:30
David Wang Auditorium, 3rd floor Dalia Maydan Bldg
Dr. Chandra Sekhar Rout

 Dr. Chandra Sekhar Rout Basic Sciences, Indian Institute of Technology Bhubaneswar

E-mail: csrout@iitbbs.ac.in

The ever-growing global demand of energy together with the depletion of fossil fuels makes it critical to develop sustainable and renewable energy resources. Developing relevant energy storage system such as supercapacitors and batteries is essential to utilizing sustainable and renewable energy resources. Supercapacitors store energy in terms of both electrostatic double layer capacitance (EDLC) and pseudocapacitance. Nanostructured hybrid materials with both organic and inorganic components have attracted much attention recently due to the possibility of tailoring their dimensionality to facilitate a change in their fundamental properties including redox potential, conductivity and charge storage, in comparison with those of their bulk analogs. In my talk, I’ll discuss the working principles and fundamental aspects of supercapacitors and the recent achievements of our research group on design of 2D layered materials and reduced graphene oxide hybrids for supercapacitor applications. Some of our recent findings on supercapacitors based on graphene analogue 2D layered materials, nanosheets and their hybrids for high performance supercapacitors will be highlighted. Also, the effect of nanostructures on the properties of supercapacitor performances including specific capacitance, rate capability, energy density, power density and cycle stability for the next generation of supercapacitor electrode design will be discussed. Further, I’ll present our ongoing work on field emission properties of multilayer graphene and hybrids of graphene analogue 2D materials. There are several advantages of using 2D nanomaterials in field emission based devices, including a thickness of only a few atomic layers, high aspect ratio (the ratio of lateral size to sheet thickness), excellent electrical properties, extraordinary mechanical strength and ease of synthesis. Furthermore, the presence of edges can enhance the tunnelling probability for the electrons in layered nanomaterials similar to that seen in nanotubes. Effect of plasma (CO2, O2, Ar and N2) treatment, experimental observations and DFT calculations on the origin of enhanced field emission properties due to substantial lowering of work function on graphene supported hybrid materials or due to an overlapping of the electronic structures will be presented and discussed.