Search for dissertations about: "SOFCs"

Showing result 1 - 5 of 35 swedish dissertations containing the word SOFCs.

  2. 1. Development of Natural Mineral Composites for Low-Temperature Solid Oxide Fuel Cells

    Author : Chen Xia; Andrew R. Martin; Peter Lund; Yongdan Li; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Natural hematite; Natural rare-earth; LT-SOFCs; composite electrolytes; material characterization; conductivity; electrochemical performance.; Chemical Engineering; Kemiteknik; Teknisk materialvetenskap; Materials Science and Engineering;

    Abstract : Solid oxide fuel cells (SOFCs) have attracted growing attention worldwide because of their high conversion efficiency and low emissions when paired with clean fuel sources. Currently, reducing the temperature of SOFC to a low-temperature (LT) range is a mainstream trend of SOFC research. READ MORE

  4. 2. Exploratory Study of Novel Materials Used for Intermediate Temperature Solid Oxide Fuel Cell (IT-SOFC) Electrolytes

    Author : Junfu Bu; Pär Jönsson; Zhe Zhao; Christopher Knee; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Hafnium oxide; Solid oxide fuel cells SOFCs ; Electrolyte; Electrochemical impedance spectroscopy; Solid state reaction method; Solid state reactive sintering SSRS ; Ionic conductivity; oxygen ion conductivity; Protonic conductivity; Composite electrolyte.;

    Abstract : Currently, yttria-stabilized zirconia (YSZ) is still the dominant electrolyte material in commercial SOFC applications. But it has severe drawbacks due to its high operating temperatures. In present work, two electrolyte materials: Hf0.69Y0. READ MORE

  5. 3. Three Dimensional Multiphysics Modeling of Reversible Solid Oxide Electrochemical Cells for Degradation Studies

    Author : Maria Navasa; Värmeöverföring; []
    Keywords : SOCs; SOECs; SOFCs; multiphysics; modeling; three dimensional; transport phenomena; electrochemical reactions; overpotentials; potentials; boundary conditions; validation; experimental data; degradation; carbon deposition; steam; hydrogen; carbon dioxide; carbon monoxide; carbon activity;

    Abstract : Solid oxide electrochemical cells (SOCs) are considered a highly promising technology for providing efficient, sustainable and economic conversion between chemical energy and electrical energy. SOCs can be operated as fuel cells, where electric power is obtained from fossil or non-fossil hydrocarbon fuels depending on the origin or as electrolysis cells, whereby using electrical energy from renewable sources like wind or solar, chemical energy can be stored as fuels. READ MORE

  6. 4. Advanced BaZrO3-BaCeO3 Based Proton Conductors Used for Intermediate Temperature Solid Oxide Fuel Cells (ITSOFCs)

    Author : Junfu Bu; Pär Jönsson; Zhe Zhao; Mogens Mogensen; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Solid oxide fuel cells SOFCs ; Intermediate temperature solid oxide fuel cells ITSOFCs ; Electrolyte; Electrochemical impedance spectroscopy EIS ; Barium zirconate BaZrO3 ; Barium cerate BaCeO3 ; Solid-state reaction SSR ; Sintering; Conventional sintering CS ; Solid-state reactive sintering SSRS ; Spark plasma sintering SPS ; Ionic conductivity; Oxygen ion conductivity; Proton conductivity; Electronic conductivity; Oxygen ion conductor; Proton conductor; Oxygen partial pressure OPP ; Composite electrolyte; Materials Science and Engineering; Teknisk materialvetenskap;

    Abstract : In this thesis, the focus is on studying BaZrO3-BaCeO3 based proton conductors due to that they represent very promising proton conductors to be used for Intermediate Temperature Solid Oxide Fuel Cells (ITSOFCs). Here, dense BaZr0.5Ce0.3Y0. READ MORE

  7. 5. Ceria-based nanocomposite electrolyte for low-temperature solid oxide fuel cells

    Author : Ying Ma; Mamoun Muhammed; Peter Lund; KTH; []
    Keywords : ;

    Abstract : Solid oxide fuel cells (SOFCs) have attracted much attention because of their potential of providing an efficient, environmentally benign, and fuel-flexible power generation system for both small power units and for large scale power plants. However, conventional SOFCs with yttria-stabilized zirconia (YSZ) electrolyte require high operation temperature (800-1000°C), which presents material degradation problems, as well as other technological complications and economic obstacles. READ MORE