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Title:	Synthesis and characterization of novel electrospun nanofibers for hydrogen storage
Authors:	Samaneh Shahgaldi (P51341)
Supervisor:	Zahira Yaakob,Prof. Ir. Dr.
Keywords:	Universiti Kebangsaan Malaysia -- Dissertations Dissertations, Academic -- Malaysia Nanofibers Electrospinning
Issue Date:	30-Apr-2013
Description:	Undoubtedly, global warming is one of the main issues causing environmental degradation. Humans have consumed natural resources for many years without concern for the resultant environmental problems caused by their excessive consumption. Currently, the primary issue related to global warming is the combustion of fossil fuels such as oil, gas and coal, which may be the cause of a rise in the number of natural disasters occurring worldwide. Many researchers have focused on identifying promising candidates for renewable resources (e.g., solar, wind, biomass, and geothermal power) to decrease the consumption of fossil fuels. Hydrogen has been proposed as an ideal energy carrier because it can be synthesised by a numerous processes, using renewable energy, and can be used to make electricity at high efficiency with clean water as the only by-product. Hydrogen also has a higher chemical energy than hydrocarbon fuels (e.g., the amount of energy per unit mass released by hydrogen is threefold more than gasoline); however, the storage of hydrogen is the main barrier to the further improvement of hydrogen technology. Increasing hydrogen storage, decreasing expenditure and safety concerned are main problems in storage field. Carbon nanofibers, Titanium oxide, and boron nitride nanostructures have been individually considered as a promising hydrogen storage material. This work is dedicated to new synthesize of electrospun carbon nanofibers doped with TiO2 nanoparticles, electrospun carbon nanofibers doped with TiO2 nanofibers, TiO2 nanofibers, and electrospun Boron nitride nanofibers doped with TiO2 for first time. All nanofibers were synthesized by electrospinning method due to high productivity, simplicity and cost-effectiveness. All main parameters such as concentration of polymer, voltage, distance between nozzle and collector were studied in order to control the diameter of nanofibers and avoiding the bead formation. The problems of merging nanofibers were solved by controlling the humidity and distance between nozzle and collector. Electrospun carbon nanofibers doped with titanium nanoparticles and nanofibers reveal the positive effect of doping nanoparticles compared to nanofibers alone due to the agglomeration of titania nanofibers on carbon nanofibers. The hydrogen storage capacity of around 2.6 wt% shows the essential effect of chemical activation and doping on the increase of hydrogen storage in electrospun carbon nanofibers. In addition, hydrogen uptake of electrospun pure Titania nanofibers were studied extensively and compared with titania nanoparticles. Titania nanofibers with nanoparticles depict more than two times hydrogen uptake. Moreover, hydrogen uptake was measured on doped and undoped electrospun boron nitride nanofibers. Doped boron nitride nanofibers shows 2.1 wt% hydrogen adsorption which is around 1.5 times more than the boron nitride nanofibers. In conclusion the result proved more hydrogen uptake in electrospun form nanofibers compare with the other shape of boron nitride nanostructures.,Certification of Master's/Doctoral Thesis" is not available
Pages:	150
Call Number:	TA418.9.F5S534
Publisher:	UKM, Bangi
Appears in Collections:	Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina

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