چكيده به لاتين
Abstract
In the next 25 years, energy demand will continue to increase by at least 35% more than current consumption, with fossil fuel consumption steadily increasing. This puts a lot of pressure on non-renewable energy sources and greatly affects the Earth's climate. Supercapacitors with high energy density, mobility and optimum life cycle are the core of future technology.
Graphene is used as a superconducting electrode due to its high surface area, excellent electrical conductivity, electrochemical and mechanical stability and relatively low cost. However, graphene shows less capacity than other electrode materials.
In this study, we tried to increase the quantum capacity of graphene by using computational methods and functionalizing graphene with thionine, an organic pigment. By also functionalizing thionine with electron donor and electron acceptor functional groups and then placing them on the graphene sheet, we were able to dramatically increase the quantum capacity and the amount of charge stored on it relative to pure graphene. The results also showed that thionines functionalized with donor groups as positive electrode or cathode and electron acceptor groups as negative or anode electrode are suitable.
Also, in order to increase the electrostatic double-layer capacity (EDLC) of graphene, we were synthesized RGO/PANI/NiO nanocomposites by ball-milling method which is a non-chemical and environmentally friendly method. Then we were measured its electrochemical properties. The specific capacitance of the electrode at 1 A/gr current density was 253.67 F/gr and maintained 80% of its capacity up to 1000 charge and discharge cycles.
Key words: supercapacitors, quantum capacitance, DFT calculation, ball mill, graphene
