Sökning: "Polymer electrolyte membrane fuel cell PEFC"

Visar resultat 1 - 5 av 6 avhandlingar innehållade orden Polymer electrolyte membrane fuel cell PEFC.

  1. 1. Modelling and Experimental Investigation of the Dynamics in Polymer Electrolyte Fuel Cells

    Författare :Katarina Wiezell; Göran Lindbergh; Lars Pettersson; Anders Dahlkild; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; polymer electrolyte fuel cell; modelling; electrochemical impedance spectroscopy; water transport; membrane; Electrochemistry; Elektrokemi;

    Sammanfattning : In polymer electrolyte fuel cells (PEFC) chemical energy, in for example hydrogen, is converted by an electrochemical process into electrical energy. The PEFC has a working temperature generally below 100 °C. Under these conditions water management and transport of oxygen to the cathode are the parameters limiting the performance of the PEFC. LÄS MER

  3. 2. Development and characterisation of the components of the polymer electrolyte fuel cell

    Författare :Jari Ihonen; KTH; []
    Nyckelord :Polymer electrolyte membrane fuel cell PEFC ; Contact resistance; Clamping pressure; Stainless steel; Membrane degradation;

    Sammanfattning : .... LÄS MER

  4. 3. Development of characterisation methods for the components of the polymer electrolyte fuel cell

    Författare :Jari Ihonen; KTH; []
    Nyckelord :polymer electrolyte membrane fuel cell; contacct resistance; clamping pressure; stainless steel; membrane degradation;

    Sammanfattning : In this work characterisation methods and fuel cell hardwarewere developed for studying the components of the polymerelectrolyte fuel cell (PEFC). Humidifiers and other componentswere tested in order to develop reproducible and reliableexperimental techniques. A set-up for testing larger cells andstacks was developed. LÄS MER

  5. 4. Investigations of proton conducting polymers and gas diffusion electrodes in the polymer electrolyte fuel cell

    Författare :Peter Gode; Göran Lindbergh; Steven Holdcraft; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Theoretical chemistry; polymer electrolyte fuel cell; proton conducting membrane; porous electrode; gas permeability; degradation; water transport; Teoretisk kemi; Theoretical chemistry; Teoretisk kemi;

    Sammanfattning : Polymer electrolyte fuel cells (PEFC) convert the chemically bound energy in a fuel, e.g. hydrogen, directly into electricity by an electrochemical process. Examples of future applications are energy conversion such as combined heat and power generation (CHP), zero emission vehicles (ZEV) and consumer electronics. LÄS MER

  7. 5. Electrochemical evaluation of new materials in polymer electrolyte fuel cells

    Författare :Björn Eriksson; Carina Lagergren; Göran Lindbergh; Rakel Lindström; Piotr Zelenay; KTH; []
    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