Hydrogen storage in novel carbon materials
Keens, SG 2009, Hydrogen storage in novel carbon materials , PhD thesis, Salford : University of Salford.
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This thesis examines the potential of C 60 intercalated graphite and titanium oxide 'decorated' graphite as sorbing hydrogen storage media. Initially, various types of natural flake graphite were examined and characterised with X-ray diffraction and electron microscopy techniques. Each type was assessed for suitability for modification by considering impurities, crystal structure and internal strain. Samples of increased-surface-area exfoliated graphite were then produced as an initial template for surface modification techniques, and a sample against which to compare gas-sorption characteristics. C60 intercalated graphite was produced in order to assess whether fullerenes might be used to create spacing within graphitic structures to maximise surface area and increase energies of adsorption at sites around the C60 molecule. Samples were made via a sublimation method, depositing C60 molecules onto surfaces where it was subsequently inaccessible to its solvents. Titanium oxide coated materials were created via a wet chemistry route followed by thermal decomposition, in order to examine whether this material plays a role in hydrogen uptake via 'spillover' catalysis reported to be caused by palladium/titanium oxide deposits upon surfaces. Each sample created was characterised using X-ray diffraction, electron microscopy and gas-sorption techniques; its apparent density determined by argon displacement, and then assessed for specific nitrogen BET surface area and hydrogen uptake at cryogenic temperatures. Although the methods of creating the C 60 intercalated samples proved detrimental to the material's surface area, it was found that the hydrogen surface sorption capability (uptake per unit surface area) was almost doubled. However, hydrogen uptake was effectively negated by titanium oxide surface depositions even though its surface area was increased. Future work is planned to further investigate the C 60 intercalated material.
|Item Type:||Thesis (PhD)|
|Contributors:||Boag, NM (Supervisor) and Platt, NP (Supervisor)|
|Schools:||Schools > School of Computing, Science and Engineering|
|Depositing User:||Institutional Repository|
|Date Deposited:||03 Oct 2012 13:34|
|Last Modified:||30 Nov 2015 23:58|
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