Search for dissertations about: "Elektrokemi"

Showing result 1 - 5 of 51 swedish dissertations containing the word Elektrokemi.

  1. 1. Influence of the electrolyte on the electrode reactions in the chlorate process

    University dissertation from Stockholm : KTH

    Author : Linda Nylén; KTH.; [2008]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Chlorate; chloride oxidation; critical anode potential; chromate; DSA; hydrogen evolution; iron; mass transport; oxygen evolution; REM; RDE; steel; NATURAL SCIENCES Chemistry Analytical chemistry Electrochemistry; NATURVETENSKAP Kemi Analytisk kemi Elektrokemi;

    Abstract : The chlorate process is very energy intensive and a major part of the production costs are for electrical energy. Since the electricity prices are constantly increasing and may also vary periodically, the chlorate plants may be forced to adjust their production rate to the price at each moment in order to minimise their costs. READ MORE

  2. 2. New Materials for the Molten Carbonate Fuel Cell

    University dissertation from Stockholm : KTH

    Author : Sara Randström; KTH.; [2008]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Molten Carbonate Fuel Cell; Anode current collector; Cathode; Wet-seal; Ionic liquid; TFSI; Smältkarbonatbränslecell; Anodströmtilledare; Katod; Wet-seal; Jonvätska; TFSI; NATURAL SCIENCES Chemistry Analytical chemistry Electrochemistry; NATURVETENSKAP Kemi Analytisk kemi Elektrokemi;

    Abstract : Smältkarbonatbränslecellen (MCFC) är en högtemperaturbränslecell för stationära applikationer. Den har samma höga totalverkningsgrad som konventionella kraftvärme-anläggningar, men kan byggas i mindre moduler (från 250 kWe). READ MORE

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

    University dissertation from Stockholm : KTH Royal Institute of Technology

    Author : Katarina Wiezell; KTH.; [2009]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; polymer electrolyte fuel cell; modelling; electrochemical impedance spectroscopy; water transport; membrane; NATURAL SCIENCES Chemistry Analytical chemistry Electrochemistry; NATURVETENSKAP Kemi Analytisk kemi Elektrokemi;

    Abstract : 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. READ MORE

  4. 4. Diagnosis of the Lifetime Performance Degradation of Lithium-Ion Batteries Focus on Power-Assist Hybrid Electric Vehicle and Low-Earth-Orbit Satellite Applications

    University dissertation from Stockholm : KTH

    Author : Shelley Brown; KTH.; [2008]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; lithium-ion battery; LixNi0.8Co0.15Al0.05O2; LixMn2O4; LiyC6; ageing; three-electrode measurements; impedance modelling; surface film characterisation; hybrid electric vehicle; low-earth-orbit satellite; litiumjonbatteri; åldring; treelektroduppställning; impedansmodell; ytfilmskarakterisering; hybridfordon; satelliter; TECHNOLOGY Chemical engineering Chemical process and manufacturing engineering Electrochemistry; TEKNIKVETENSKAP Kemiteknik Kemisk process- och produktionsteknik Elektrokemi;

    Abstract : Lithium-ion batteries are a possible choice for the energy storage system onboard hybrid electric vehicles and low-earth-orbit satellites, but lifetime performance remains an issue. The challenge is to diagnose the effects of ageing and then investigate the dependence of the magnitude of the deterioration on different accelerating factors (e.g. READ MORE

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

    University dissertation from Stockholm : KTH

    Author : Henrik Ekström; KTH.; [2007]
    Keywords : 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;

    Abstract : 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). READ MORE