Search for dissertations about: "perovskites"

Showing result 1 - 5 of 37 swedish dissertations containing the word perovskites.

  1. 1. Vibrational proton dynamics in hydrated perovskites and alkali thio-hydroxogermanates

    Author : Maths Karlsson; [2005]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; fuel cell; proton conduction; perovskites; proton dynamics; thio-hydroxogermanates; vibrational spectroscopy;

    Abstract : .... READ MORE

  2. 2. Solid state proton conductors: hydrated perovskites and hydrated alkali thio-hydroxogermanates

    Author : Maths Karlsson; [2007]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; neutron scattering; vibrational spectroscopy; alkali thio-hydroxogermanates; Proton conductors; fuel cells.; perovskites;

    Abstract : This thesis concerns experimental studies of hydrated perovskites and hydrated alkali thio-hydroxogermanates, two classes of solid state proton conductors which are promising to be used as electrolytes in future intermediate temperature (200-500°C) fuel cells.This is an attractive temperature range for many applications but for which today's available electrolytes do not show satisfactory performance. READ MORE

  3. 3. Functional Oxide Materials exhibiting Ionic Conductivity for Future Energy Conversion Needs

    Author : FRANCIS GACHAO KINYANJUI; [2013]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; neutron diffraction; perovskites; oxygen deficient perovskites; BaSnO3; Rietveld refinements; BaZrO3; in-situ cells; proton conduction; deuteron position; Ba3In2ZrO8;

    Abstract : Fuel cells are electrochemical devices that transform the chemical energy in hydrogen and oxygen into electrical energy at high efficiencies and produce only water vapour emissions. Materials with the perovskite or fluorite structure types are commonly employed as the ion conducting ceramic electrolyte membranes in intermediate and high temperature fuel cells. READ MORE

  4. 4. Proton Conducting Ceramics; Synthesis, Characterization and Sample Cell Environments

    Author : FRANCIS GACHAO KINYANJUI; [2012]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; perovskites; neutron diffraction; Rietveld refinements; BaSnO3; in-situ cell; deuteron position; proton conduction; BaZrO3;

    Abstract : Acceptor doped Perovskite ceramics have been shown to exhibit high levels of protonic conduction in humid atmospheres. However significant grain boundary resistance and long sintering times required to achieve sufficient grain size growth has hindered their widespread application as electrolyzers, fuel cells and gas separation membranes. READ MORE

  5. 5. Super-resolution Luminescence Micro-Spectroscopy : A nano-scale view of solar cell material photophysics

    University dissertation from Lund University, Faculty of Science, Department of Chemistry, Division of Chemical Physics

    Author : Aboma Merdasa; [2017-01]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; super-resolution microscopy; Single Molecule Spectroscopy; J-aggregates; perovskites; photophysics;

    Abstract : Optical microscopy is a fundamental tool in a range of disciplines encompassed by the physical and biological sciences. At the dawn of this millennium, a break-through was made in optical microscopy where super-resolution methods emerged and declared imaging beyond the optical diffraction limit a possibility. READ MORE