Sökning: "Elektrokemiska prestanda"

Visar resultat 1 - 5 av 9 avhandlingar innehållade orden Elektrokemiska prestanda.

  1. 1. Mathematical Models for Investigation of Performance, Safety, and Aging in Lithium-Ion Batteries

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Tommy Georgios Zavalis; KTH.; [2013]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; lithium-ion battery; modeling; electrochemical processes; impedance; polarization; performance; safety; aging; power optimized battery; litiumjonbatteri; modellering; elektrokemiska processer; impedans; polarisation; prestanda; säkerhet; åldring; effektoptimerat batteri;

    Sammanfattning : Rechargeable lithium-ion batteries have both the power and energy capabilities to be utilized in hybrid electric vehicles and other power demanding applications. However, there are obstacles primarily related to reliability in safety and lifetime. Additionally, there is still room for improvement in the battery performance. LÄS MER

  2. 2. Application of Rare-Earth Doped Ceria and Natural Minerals for Solid Oxide Fuel Cells

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Yanyan Liu; KTH.; [2019]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Low-temperature solid oxide fuel cells; Doped ceria; Material characterizations; Electrochemical performances; Natural minerals; Lågtemperatur fastoxidbränsleceller; Dopade ceriumoxid; Materialkarakteriseringar; Elektrokemiska prestanda; Naturliga mineraler.; Energiteknik; Energy Technology; Materials Science and Engineering; Teknisk materialvetenskap; Chemical Engineering; Kemiteknik;

    Sammanfattning : Although solid oxide fuel cell (SOFC) technology exhibits considerable advantages as compared to other energy conversion devices, e.g. high efficiency, low emission and fuel flexibility, its high operating temperature leads to rapid component degradation and has thus hampered commercialization. LÄS MER

  3. 3. Thermodynamic Modelling and Performance of Combined Solid Oxide Fuel Cell and Gas Turbine Systems

    Detta är en avhandling från Department of Heat and Power Engineering, Lund university

    Författare :Jens Pålsson; Lund University.; Lunds universitet.; [2002]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; vakuumteknik; vibrationer; akustik; Motors and propulsion systems; Motorer; framdrivningssystem; Gases; fluid dynamics; plasmas; plasma; hydraulik; Maskinteknik; vibration and acoustic engineering; hydraulics; vacuum technology; Modelling; Mechanical engineering; Solid oxide fuel cell; Hybrid system; Gaser; fluiddynamik;

    Sammanfattning : Solid oxide fuel cells (SOFCs) are a ceramic type of fuel cell operating at elevated temperatures. By utilising the thermal energy from the SOFC in a heat engine, a hybrid cycle with high performance can be achieved. One promising concept is a pressurised SOFC in combination with a recuperated gas turbine cycle. LÄS MER

  4. 4. Electrochemical evaluation of new materials in polymer electrolyte fuel cells

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Björn Eriksson; KTH.; [2019]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fuel cell; Pt-REM; Alloy catalyst; Multi walled carbon nanotubes; Bipolar plates; Water transport; Bränslecell; Pt-REM; Legerad katalysator; Flerväggade kolnanorör; Bipolära plattor; Vattentransport; Chemical Engineering; Kemiteknik;

    Sammanfattning : Polymer electrolyte fuel cells (PEFC) convert the chemical energy in hydrogen to electrical energy and heat, with the only exhaust being water. Fuel cells are considered key in achieving a sustainable energy sector. The main obstacles to wide scale commercialization are cost and durability. LÄS MER

  5. 5. Multiphysics modelling of PEM fuel cells - with reacting transport phenomena at micro and macroscales

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Munir Khan; Lund University.; Lunds universitet.; [2011]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; macroscale; PEM fuel cells; CFD; microscale; multiphysics; multiphase; anisotropy;

    Sammanfattning : This thesis presents numerical simulations of reacting transport phenomena in polymer electrolyte membrane (PEM) fuel cells. Broadly, the presented work is subdivided into macro and microscale simulations. LÄS MER