M.Phil / MS

Now showing 1 - 3 of 3

Fabrication and Characterization of Tin Oxide Based Flexible Composites for Energy Storage Applications
(Library Information Services, COMSATS University Islamabad, Lahore Campus, 2017) NAEEM MUNIR; CIIT/FA15-RPH-030/LHR; Dr.M Aamir Razaq; LHR TP 6986
Tin Oxide (SnO2) is excessively used for energy storage applications due to wide potential, transparency and thermal stability. Several methods are reported for fabrication of SnO2 nano structures e.g. electro spinning, chemical vapor deposition process, self assembly, homogeneous precipitation method, thermal decomposition and hydrothermal method. Hydrothermal method is advantageous due to low cost, template free, environment friendly and low temperature. In this study, SnO2 is fabricated via hydrothermal method and furthermore composites with CuO, ZnO and lignocelluloses fiber are synthesized for development of electrochemically efficient and flexible paper electrodes for energy storage. X-Ray diffraction, Scanning Electron Microscopy (SEM), FTIR and Cyclic Voltammetry measurements of fabricated composites were employed to characterize the morphology, structural and electrochemical characteristics. SEM reveals the nano-petal and nanorods morphology of SnO2 and CuO, respectively. XRD measurements confirm the fabrication of SnO2, SnO2/CuO and ZnSnO3 by JCD cards (41-1445), (48-1548) and (34-1451) respectively. Cyclic Voltammetry confirm the electrochemical kinetics of fabricated composites which are highly feasible for super capacitors and batteries.
Fabrication and Characterization of Nanostructured Metal Sulfide/Reduced Graphene Oxide Composite Electrodes for High Performance Supercapacitor
(Library Information Services, COMSATS University Islamabad, Lahore Campus, 2020) SHEHAR BANO; CIIT/SP19-RPH-003/LHR; Dr. Muhammad Aamir Razaq; LHR TP 6367
In era of the modern energy storage technology fast charging in parallel to better cycling stability are required demands from the industrial market. Energy shortage around the world is currently emerging as a vital subject to be resolved. The rapid demand for energy usage leads the research path, along with ease of utility, towards the production of highly functional energy devices. Modern industries are striving to achieve highly effective, light-weight, portable and environment friendly energy storage devices like batteries and supercapacitors to meet the current energy demands. Thus, paper electrodes play a vital role for modern flexible, light-weight and portable component of such devices. Herein, the research work presents synthesis of materials and fabrication of environment friendly, flexible, light-weight paper electrodes for supercapacitor. Natural fibers extracted from self-growing plants corn incorporate to provide mechanical stability to acts as non-toxic natural binders for electrode development. Reduced graphene oxide (RGO) is renowned for better cycling stability however lacks fast charging due to low surface area and poor electronic conductivity. Nanostructured metal sulfides e.g. Molybdenum disulphide (MoS2) can provide the high surface area to enhance the kinetics required for fast charging. Presented study is an attempt to fabricate MoS2/rGO composite materials for the development of high power density and better cyclic stability electrode for supercapacitor application. MoS2 synthesized through hydrothermal method and Reduced Graphene oxide is prepared after Graphene oxide is synthesized through Modified Hummer method is further reduced thermally to obtain reduced graphene oxide. MoS2/rGO composite is prepared through hydrothermal method. Corn fibers are incorporated to MoS2/rGO acted as natural binder for fabrication of paper electrodes. The developed electrodes were investigated and compared for energy storage applications through electrochemical analysis including cyclic voltammetry and Galvanostatic charge discharge testing via 3-electrode system. Other characterizations (FTIR, Raman, and SEM) were under processed due to covid 19 (for analyzing the developed material and its composite). Overall analysis confirms the successful formation of material and composite. The electrode showed excellent electrochemical response with specific capacitance and good cyclic stability. Further utility for symmetric or asymmetric supercapacitor could be done accordingly. Therefore, the prepared electrodes are moderate to utilize in energy storage applications.
Fabrication and Characterization of High Surface Area/Nanostructured Metal Based Composites for Energy Storage Applications
(Library Information Services, COMSATS University Islamabad, Lahore Campus, 2020) Muhammad Ahmar Chohan; CIIT/SP18-RPH-006 /LHR; Dr. Ishrat Sultana; LHR TP 6070
Novelty in energy storage and energy conversion devices have been received subjected of great interest as an alternative energy source in nanoscience and nanotechnology. Nanostructure materials have a lot of potential in energy storages application due to their dimensions which plays a vital rule in defining the properties of nonmaterial. We have many materials for energy storage applications, amongst many of the materials manganese dioxide (MnO2) is very suitable medium for supercapacitors and electrodes. In this thesis we have fabricated MnO2 nanostructure as an electrode material for energy storage and energy conversion devices by employed Microwave Assisted Method with freedom of template fee synthesis. Amongst many of the metal oxides, MnO2 exhibit a lot of interesting characteristics, for instance inexpensive, eco-friendly, and a high specific capacitance (1370 F g−1), propose it as the most favorable electrode medium for supercapacitors. Presented thesis is an attempt to enhance the specific capacitance and high surface area of MnO2 composites for their potential applications as energy storage devices.

M.Phil / MS

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