Sökning: "PEM fuel cell"

Visar resultat 16 - 20 av 24 avhandlingar innehållade orden PEM fuel cell.

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

   Författare :Munir Khan; Värmeöverföring; []
   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

3. 17. Requirement and Availability of Scarce Metals for Fuel-Cell and Battery Electric Vehicles

   Författare :Ingrid Råde; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; metal requirement; sustainability; fuel cells; batteries; platinum; metal scarcity; resources; electric vehicles; metal availability; industrial ecology;

   Sammanfattning : Battery and fuel-cell electric vehicles (EVs) are considered as a means to meet some of the environmental and resource challenges of todays road vehicle system. EVs have the potential for zero tailpipe emissions as well as an energy efficiency higher than internal combustion engine vehicles and they can be flexible concerning primary energy source. LÄS MER

4. 18. Electronic structure and spectroscopy calculations in fuel cell catalysis

   Författare :Henrik Öberg; Lars G.M. Pettersson; Göran Lindbergh; Stockholms universitet; []
   Nyckelord :Chemical Physics; kemisk fysik;

   Sammanfattning : This thesis presents joint experimental and theoretical studies of surface phenomena at an electronic structure level in proton exchange membrane fuel cells (PEM-FC's). The fuel cell activity can be related to the oxygen reduction taking place at the cathodic surface through the oxygen reduction reaction (ORR). LÄS MER

5. 19. Limiting processes in anion-exchange membrane fuel cells

   Författare :Henrik Grimler; Göran Lindbergh; Rakel Wreland Lindström; Carina Lagergren; Marc Secanell; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; anion-exchange membrane fuel cell; hydrogen oxidation reaction; oxygen reduction reaction; water transport; physics-based modelling; Chemical Engineering; Kemiteknik;

   Sammanfattning : Fuel cells allow for converting chemical energy stored in hydrogen into electrical energy, with only heat and water as by-products. In a sustainable energy society, hydrogen may play an important role due to its ability to act both as an energy carrier and as a valuable chemical in the process industry. LÄS MER

7. 20. Membrane Electrode Assemblies Based on Hydrocarbon Ionomers and New Catalyst Supports for PEM Fuel Cells

   Författare :Sophie von Kraemer; Göran Lindbergh; Antonino Aricò; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Catalyst support; Carbon; High Temperature Proton Exchange Membrane Fuel Cell; Hydrocarbon Ionomer; Membrane Electrode Assembly; Nafion; PEFC; PEMFC; Porous Electrode; Sulfonated Polysulfone; Titanium Dioxide; Chemical engineering; Kemiteknik;

   Sammanfattning : The proton exchange membrane fuel cell (PEMFC) is a potential electrochemicalpower device for vehicles, auxiliary power units and small-scale power plants. In themembrane electrode assembly (MEA), which is the core of the PEMFC single cell,oxygen in air and hydrogen electrochemically react on separate sides of a membraneand electrical energy is generated. LÄS MER