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Synthesis and Characterization of Supercapacitor Electrodes Based on Graphene and MnO2 Nanostructure
, M.Sc. Thesis Sharif University of Technology ; Moshfegh, Alireza (Supervisor) ; Moradlou, Omran (Co-Advisor)
Abstract
Supercapacitors represent a new class of energy storage devices that have been attracted many researchers in last few years. Graphene with unique properties such as superior electrical conductivity and large specific surface area is one of the most suitable materials in supercapacitor applications. Besides, metal oxides are being used as active compounds in supercapacitors due to their role in redox reactions. In this research, synthesis and characterization of supercapacitor electrodes based on graphene and MnO2 nanostructured materials was studied under different conditions. For this purpose, Graphene oxide (GO) was synthesized by Hummers’ method and then, it was deposited on a nickel foam...
Design, Fabrication, and Application of Nickel Oxide-Base Nanostructured Electrocatalysts for the Production of Oxygen And Hydrogen from Seawater
, Ph.D. Dissertation Sharif University of Technology ; Moshfegh, Alireza (Supervisor) ; Moradlou, Omran (Supervisor)
Abstract
Hydrogen is emerging as a clean and ideal fuel. However, its dependency on freshwater resources will be a threat to a sustainable environment. Considering the abundance of seawater and the scarcity of freshwater resources, direct electrolysis of seawater to produce hydrogen fuel can be a promising and potential alternative to pure water electrolysis technologies. Seawater contains electrochemically active ions with the nature of competition with the oxidation reaction of water, thus affecting the catalytic activity and, subsequently, the selectivity. From the thermodynamic and kinetic aspect in the electrolysis of seawater, the unfavorable reaction related to the formation of chlorine...
Synthesis, Characterization and Photoelectrochemical Application of two Dimensional MoS2 and WS2 Nanosheets
, Ph.D. Dissertation Sharif University of Technology ; Zaker Moshfegh, AliReza (Supervisor) ; Moradlou, Omran (Co-Advisor)
Abstract
In this research, Synthesis, characterization and photoelectrochemical application of two dimensional MoS2 and WS2 nanosheets have been carefully investigated. And finally, based on theoritical and experimental analysis results, the mechanisms of the observed photoelectrochemical (PEC) activities were suggested.The ab initio density functional calculations about Mo1-xWxS2 monolayer deposited over a TiO2 (110) substrate revealed a shift in band position of the Mo1-xWxS2 in favor of photoelectrochemical water splitting. Moreover, increase of W concentration in Mo1-xWxS2 could improve the charge separation and increase the effective mass ratio leading to an extension of the electron–hole...