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| Title |
Laser induced periodics surface structures on nickel electrodes for hydrogen production through alkaline electrolysis |
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Author
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Τσανάκας, Μιχαήλ-Δωρόθεος
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Thesis advisor
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Λουκάκος, Παναγιώτης
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Reviewer
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Φωτάκης, Κωνσταντίνος
Μουσταϊζής, Σταύρος
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| Abstract |
The following thesis was conducted in the Femtosecond Laser Spectroscopy in Solid State (FLASSS)
laboratory of the Institute of Electronic Structure and Laser (IESL) of Foundation for Research and
Technology– Hellas (FORTH) in collaboration with the Matter Structure and Laser Physics Laboratory of
the Technical University of Crete. The purpose of this thesis is the fabrication of nanostructures on Nickel
surfaces through irradiation by high fluence, ultrashort laser pulses, and the use of the nanostructured
sheets as electrodes in alkaline electrolysis for Hydrogen production.
Scanning Electron Microscope was employed in order to assess the morphological characteristics of the
obtained surfaces. We found that periodic surface nanostructures are formed by the laser irradiation. We
performed a study of the different parameters that define the formation of the nanostructures, such as the
polarization of the laser beam, the intensity and the scanning speed of the sample, or equivalently, the
number of incident pulses per spot. The results showed that the periodicity is not affected by the scanning
direction and also that there is no relation between the periodicity and the number of pulses irradiating a
spot. The periodicity of the nanostructures is thus defined by the intrinsic properties of the material and
the wavelength of the incident laser field.
The fabricated nanostructured electrodes were used in an electrolysis chamber for the evaluation of
Hydrogen production. We found a significant enhancement of Hydrogen production when nanostructured
electrodes are used. The results provide evidence that the electrodes irradiated with a larger number of
pulses per spot are more beneficial to Hydrogen production. An enhancement factor of 3.7 with respect to
the flat i.e. unstructured electrodes was found which is a remarkable improvement to the state of the art.
The results are very encouraging for continuing studies in this direction employing different surface
nanostructures, laser parameters and combinations of electrode materials.
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| Language |
English |
| Issue date |
2021-03-24 |
| Collection
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School/Department--School of Sciences and Engineering--Department of Physics--Graduate theses
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Type of Work--Graduate theses
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| Permanent Link |
https://elocus.lib.uoc.gr//dlib/a/d/7/metadata-dlib-1615450252-416624-25470.tkl
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| Views |
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