Sökning: "polymer electrolyte fuel cell"

Visar resultat 1 - 5 av 34 avhandlingar innehållade orden polymer electrolyte fuel cell.

  1. 1. Evaluating Cathode Catalysts in the Polymer Electrolyte Fuel Cell

    Detta är en avhandling från Stockholm : KTH

    Författare :Henrik Ekström; KTH.; [2007]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; fuel cell; humidity; model electrodes; Nafion; oxygen reduction; PEMFC; platinum; polymer electrolyte; thin film evaporation; titanium oxide; bränslecell; fuktighet; modellelektroder; Nafion; PEMFC; platina; polymerelektrolyt; syrereduktion; tunnfilmsförångning; titanoxid; TECHNOLOGY Chemical engineering Chemical process and manufacturing engineering Electrochemistry; TEKNIKVETENSKAP Kemiteknik Kemisk process- och produktionsteknik Elektrokemi;

    Sammanfattning : The polymer electrolyte membrane fuel cell (PEMFC) converts the chemical energy of hydrogen and oxygen (air) into usable electrical energy. At the cathode (the positive electrode), a considerable amount of platinum is generally required to catalyse the sluggish oxygen reduction reaction (ORR). LÄS MER

  2. 2. Design and evaluation of stationary polymer electrolyte fuel cell systems

    Detta är en avhandling från Stockholm : Kemiteknik

    Författare :Cecilia Wallmark; KTH.; [2004]
    Nyckelord :Small-scale; stationary; fuel cell system; polymer electrolyte fuel cell; PEFC system; reformer; thermodynamic modelling; pinch technology; exergy analyses; system configuration; test facility; experiments; application; simulation; installation; ener;

    Sammanfattning : The objectives of this doctoral thesis are to give a basisincluding methods for the development of stationary polymerelectrolyte fuel cell (PEFC) systems for combined heat andpower production. Moreover, the objectives include identifyingprerequisites, requirements and possibilities for PEFC systemsproducing heat and power for buildings in Sweden. LÄS MER

  3. 3. Nanostructured Fuel Cell Catalysts

    Detta är en avhandling från Stockholm : Kemiteknik

    Författare :Marie Gustavsson; [2006]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Nafion; thin film evaporation; model catalyst; electrocatalyst; acetic acid oxidation; oxygen reduction; colloidal lithography; PEMFC; screening; Pt; formaldehyde oxidation; methanol oxidation; nanofabrication; CO oxidation; polymer electrolyte; TiOx;

    Sammanfattning : A long term challenge for society is to develop sustainable energy systems to reduce the dependence on fossil fuels and to decrease air pollution. This requires new alternatives regarding the supply of energy and increased efficiency of the future energy systems. Fuel cell technology is one such possible alternative. LÄS MER

  4. 4. Electrochemical Reactions in Polymer Electrolyte Fuel Cells

    Detta är en avhandling från Stockholm : KTH

    Författare :Maria Wesselmark; KTH.; [2010]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fuel cell; model electrodes; oxygen reduction; methanol oxidation; formic acid oxidation; hydrogen oxidation; CO oxidation; degradation; tungsten oxide; carbon support; Bränslecell; modellelektroder; syrgasreduktion; metanoloxidation; myrsyraoxidation; vätgasoxidation; CO oxidation; degradering; wolfram oxid; kolsupport; TECHNOLOGY Chemical engineering; TEKNIKVETENSKAP Kemiteknik;

    Sammanfattning : The polymer electrolyte fuel cell converts the chemical energy in a fuel, e.g. hydrogen or methanol, and oxygen into electrical energy. The high efficiency and the possibility to use fuel from renewable sources make them attractive as energy converters in future sustainable energy systems. LÄS MER

  5. 5. Electrochemical characterisation of porous cathodes in the polymer electrolyte fuel cell

    Detta är en avhandling från Stockholm : Kemiteknik

    Författare :Frédéric Jaouen; KTH.; [2003]
    Nyckelord :polymer electrolyte fuel cell; cathode; mass transport; porous electrode; modelling; agglomerate model; electrochemical impedance spectroscopy; current interrupt; transient techniques; non-noble catalysts;

    Sammanfattning : Polymer electrolyte fuel cells (PEFC) convert chemicalenergy into electrical energy with higher efficiency thaninternal combustion engines. They are particularly suited fortransportation applications or portable devices owing to theirhigh power density and low operating temperature. LÄS MER