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Development of Improved Conversion Energy System based on High Temperature Fuel Cells
, M.Sc. Thesis Sharif University of Technology ; Roshandel, Ramin (Supervisor)
Abstract
Sustainable development is the basic aim of energy researchers. But common conversion technologies with respect to efficiency, fuel type and pollution of them, need basic operating improvement to reach sustainable development. Aim of this project is investigation of high temperature fuel cells as basic energy convertor. To improve performance of fuel cell system, four integration systemsare modeled and proposed. Using integrated systems in combined cooling, heat and power is another way of improving performance of systems, that is done in this project.
To improve system performance, the optimum operating values of these parameters is determined. In order to use four proposed system in...
To improve system performance, the optimum operating values of these parameters is determined. In order to use four proposed system in...
Effect of Doping la/nd in pr Site and fe/cu in ni Site on Thermal Stability of the Pr2NiO4+δ as the Cathode of Intermediate Temperature Solid Oxide Fuel Cell
, M.Sc. Thesis Sharif University of Technology ; Fagihi Sani, Mohammad Ali (Supervisor)
Abstract
Solid oxide fuel cells (SOFCs) are a route to highly efficient and clean power, which have been attracting interest due to the issues associated with the ever-increasing energy demand and pollution. However, their commercialization is hindered by the high operating temperatures (700-1000℃). One of the challenges faced by intermediate temperature solid oxide fuel cells (IT-SOFCs) with operating temperature in the range of 500-700℃ is the increased overpotentials of the components, especially cathode. Lanthanide nickelates (Ln2NiO4+δ, Ln = La,Pr,Nd) with mixed ionic and electronic conduction (MIEC) have already been introduced as promising IT-SOFC cathode materials. Among them, Pr2NiO4+δ...
Economically Optimal and Inherently Safe Design and Operation of Microreactor for Hydrogen Production in Portable Power Generation Devices Such as PEM Fuel Cell
, M.Sc. Thesis Sharif University of Technology ; Rashtchian, Davood (Supervisor) ; Sharifzadeh, Mehdi (Supervisor)
Abstract
Due to high efficiency and modular production ability of fuel cells, they have been used extensively in the power plants, especially in portable devices such as fuel cell vehicles. The commercialization of the equipment is dependent on ensuring the safety of their operations. Many of these platforms employ steam reforming reactions at very high temperature in order to produce the hydrogen, which is implemented as the fuel in the PEM fuel cell. The technique of miniaturization is a promising approach to design a chemical process in which the rate of transport phenomena such as the mass and heat transfer are intensified by reducing the size of the reactor and allowing the process to be run...
New blend nanocomposite membranes based on PBI/sulfonated poly(ether keto imide sulfone) and functionalized quantum dot with improved fuel cell performance at high temperatures
, Article International Journal of Energy Research ; Volume 45, Issue 15 , August , 2021 , Pages 21274-21292 ; 0363907X (ISSN) ; Rezania, H ; Vatanpour, V ; Rastgoo Deylami, M ; Rajabi, H. R ; Sharif University of Technology
John Wiley and Sons Ltd
2021
Abstract
In this work, we reported the synthesis of a sulfonated poly(ether keto imide sulfone) (SPEKIS) using a novel aromatic diol containing nitrogen heterocycles and sulfonic monomer. New nanocomposite blend membranes were prepared using obtained SPEKIS and polybenzimidazole (PBI) with the incorporation of zinc sulfide (ZnS) functionalized quantum dots (FQDs) having both -COOH and NH2 groups with a solution-casting method and were used as proton exchange membranes. The SPEKIS and ZnS FQDs were used for the first time in the preparation of new nanocomposite blend membranes based on PBI. The purpose of this study is to investigate the effect of SPEKIS and ZnS FQDs on the PBI membrane performance in...