Sökning: "Grafit"

Visar resultat 16 - 20 av 21 avhandlingar innehållade ordet Grafit.

1. 16. Large-Scale Graphene Production for Environmentally Friendly and Low-Cost Energy Storage : Production, Coating, and Applications

   Författare :Nicklas Blomquist; Håkan Olin; Renyun Zhang; Christina Dahlström; Patrik Johansson; Mittuniversitetet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Graphene; Energy storage; Supercapacitors; EDLC;

   Sammanfattning : There is great demand for energy-efficient, environmentally sustainable, and cost-effective electrical energy storage devices. One important aspect of this demand is the need for automotive electrification to achieve more energy-efficient transportation at a reasonable cost, thus supporting a fossil-fuel free society. LÄS MER

3. 17. Picosecond X-ray Diffraction Studies of Bulk and Nanostructure Materials

   Författare :Andrius Jurgilaitis; Atomfysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; solid-liquid transitions; X-ray diffraction and scattering; nanowires; laser beam impact phenomena; phonons in crystal lattices; Fysicumarkivet A:2012:Jurgilaitis;

   Sammanfattning : Fast phenomena occurring after laser excitation were studied using time-resolved X-ray diffraction (TXRD). In most experiments, a femtosecond laser pulse was used to excite the sample, and X-rays were used as a probe. LÄS MER

4. 18. Above and Below Graphene: Nanoparticle Chemistry and Interface Reactions

   Författare :Elin Grånäs; Synkrotronljusfysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Graphene; Scanning tunneling microscopy; X-ray photoelectron spectroscopy; Adsorption; Nanoparticles; Ir 111 ; Surface science;

   Sammanfattning : The work presented in this dissertation addresses two main topics: (i) graphene supported nanoparticles and their stability upon gas adsorption, and (ii) intercalation of different molecules under graphene and their reactions under graphene. From an interplay of X-ray photoelectron spectroscopy, scanning tunneling microscopy, low energy electron diffraction, and density functional theory an atomic scale understanding of both the nanoparticles and the intercalated structures is obtained. LÄS MER

5. 19. Electrochemical characterization of materials for next generation polymer electrolyte fuel cells

   Författare :Timon Novalin; Rakel Wreland Lindström; Göran Lindbergh; Carina Lagergren; Gareth Hinds; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Polymer electrolyte fuel cells; PEMFC; AEMFC; bipolar plates; corrosion; poly arylene piperidinium ; ionomer; electrode structure; silver nanoparticles; oxygen reduction reaction; Polymerelektrolytbränsleceller; PEMFC; AEMFC; bipolära plattor; korrosion; poly arylenpiperidinium ; jonomer; elektrodstruktur; silvernanopartiklar; syrgasreduktionsreaktion; Chemical Engineering; Kemiteknik;

   Sammanfattning : Polymer electrolyte fuel cells occupy a key position in implementing the hydrogen economy on a global scale. However, assessments of cost, availability and sustainability of materials currently used to manufacture state-of-the-art fuel cell stacks have given cause for concern. LÄS MER

7. 20. Transition Metals and their Carbides, Nitrides and Carbonitrides : from a CALPHAD Perspective

   Författare :Fredrik Haglöf; Malin Selleby; Andreas Blomqvist; Susanne Norgren; Mauro Palumbo; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Teknisk materialvetenskap; Materials Science and Engineering;

   Sammanfattning : The CALPHAD (CALculation of PHAse Diagrams) method consists of three cornerstones, i.e. experiments, computational methods (e.g. LÄS MER