Sökning: "Dag Noréus"

Hittade 5 avhandlingar innehållade orden Dag Noréus.

1. 1. Synthesis and characterisation of Zintl hydrides

   Författare :Thomas Björling; Dag Noréus; Yvonne Andersson; Stockholms universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Zintl hydrides; BaGa2H2; SrAl2H2; SrAlSiH; BaAlSiH; CaAlSiH; SrGa2H2; Chemistry; Kemi; Structural Chemistry; strukturkemi;

   Sammanfattning : The synthesis, structural characterisation and the properties of the Zintl hydrides AeE2H2 and AeAlSiH (Ae = Ba, Ca, Sr; E = Al, Ga, In, Si, Zn) are reported. The first hydride in this class of compounds is SrAl2H2 which was discovered under an experiment by Gingl, who hydrogenated SrAl2 at various temperatures. LÄS MER

3. 2. Rechargeable Aqueous Batteries Based on Available Resources : Investigation and Development towards Efficient Battery Performance

   Författare :Mylad Chamoun; Dag Noréus; Gunnar Svensson; Jekabs Grins; Ann Mari Svensson; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; rechargeable aqueous batteries; alkaline electrolytes; aqueous sulfate electrolytes; zinc electrodes; manganese dioxide electrodes; iron electrodes; air electrodes; oxygen electrocatalysts; Inorganic Chemistry; oorganisk kemi;

   Sammanfattning : Batteries employing water based electrolytes enable extremely low manufacturing costs and are inherently safer than Li-ion batteries. Batteries based on zinc, manganese dioxide, iron, and air have high energy relevancy, are not resource restricted, and can contribute to large scale energy storage solutions. LÄS MER

4. 3. Transition Metal Hydride Complexes and Hydrogenated Gallium Clusters : Synthesis and Structural Properties

   Författare :Henrik Fahlquist; Dag Noréus; Maximilian Fichtner; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Metal hydrides; Solid state Synthesis; X-ray diffraction; Neutron Scattering; strukturkemi; Structural Chemistry;

   Sammanfattning : Synthesis and structural characterisation of metal hydrides in two important systems are presented. The first system presented is low valent cobalt and nickel complex hydrides with the compositions BaMg5Co2H10, RbMg5CoNiH10, SrMg2CoH7and Sr4Mg4Co3H19 featuring nickel with oxidation state of 0 and cobalt with oxidation state +I and -I. LÄS MER

5. 4. Novel Interstitial Mg–TM (TM = Ti, Zr, Hf, V, Nb and Ta) Hydrides with an FCC Structure and CaNiH3 with a Perovskite Structure

   Författare :Toyoto Sato; Dag Noréus; Bjørn C. Hauback; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Metal hydrides; Mg-based hydrides; a new Ca-Ni hydride; Chemistry; Kemi;

   Sammanfattning : This thesis is focused on structural investigations of novel interstitial ternary alkaline-earth–transition metal hydrides formed by immiscible metals that are held together by the presence of hydrogen atoms. The contents are divided in two parts: Metastable Mg-based hydrides, in which transition-metal additives improve hydrogen storage properties; and a new Ca–Ni hydride, CaNiH3, with a perovskite structure, in which hydrogen enables a Ca:Ni =1:1 ratio although no such alloy composition exists. LÄS MER

7. 5. Development of metal hydride surface structures for high power NiMH batteries : Also extended cycle-life and lead to more effective recycling methods

   Författare :Yang Shen; Dag Noréus; Andreas Züttel; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Metal hydrides; NiMH batteries; Surface treatment; Ni clusters; Rare earths hydroxides; Oxygen; Hydrogen; Inorganic Chemistry; oorganisk kemi;

   Sammanfattning : By combining alkaline etching of hydrogen storage alloys or their hydrides with a controlled oxidation, it was possible to improve reaction kinetics and accelerate activation of MH-electrodes. Both AB5 and AB2 alloys were studied where A is mixtures of rare earth elements for AB5 alloys and titanium and/or vanadium, zirconium for AB2 alloys; nickel contributes the major part of B. LÄS MER