20.500.12556/RUL-186776 Izboljšanje elektrolize vode pri povišanem tlaku z laserskim strukturiranjem platinaste površine Enhancement of water electrolysis at elevated pressure using platinum surface laser texturing Prekritost površine elektrode z vodikovimi mehurčki omejuje učinkovitost elektrolize vode, saj zmanjšuje aktivno površino za elektrokemijsko reakcijo. Lasersko strukturiranje površine omogoča nadzor nad omočljivostjo, hrapavostjo in aktivno površino elektrode ter tako predstavlja enega od pristopov za izboljšanje učinkovitosti. V nalogi je bila zasnovana matrika eksperimentov ter izvedena primerjava gladke in lasersko strukturirane platinaste elektrode pri napetostih 3,0, 4,0 in 6,0 V ter tlakih 0, 0,5, 1 in 2 bar. Gostota električnega toka je bila izmerjena za obe vrsti elektrode, dinamika nastajanja in odcepljanja vodikovih mehurčkov pa dokumentirana s hitrotekočo kamero ter ovrednotena glede premera in frekvence odcepljanja. Rezultati kažejo, da lasersko strukturirana elektroda dosega višjo gostoto električnega toka kot gladka elektroda pri vseh obravnavanih napetostih, medtem ko je vpliv strukturiranja na velikost in frekvenco odcepljanja mehurčkov odvisen od napetosti in tlaka. Rezultati so bili kritično primerjani z ugotovitvami iz literature ter ovrednoteni glede prednosti in omejitev uporabe lasersko strukturiranih elektrod pri elektrolizi vode pod povišanim tlakom. The coverage of the electrode surface with hydrogen bubbles limits the efficiency of water electrolysis, as it reduces the active surface area available for the electrochemical reaction. Laser surface texturing enables control over wettability, roughness, and the active surface area of the electrode, and thus represents one of the approaches for improving efficiency. In this thesis, an experimental matrix was designed and a comparison was carried out between a smooth and a laser-textured platinum electrode at voltages of 3.0, 4.0, and 6.0 V and pressures of 0, 0.5, 1, and 2 bar. The current density was measured for both types of electrode, while the dynamics of hydrogen bubble formation and detachment were documented using a high-speed camera and evaluated in terms of bubble diameter and detachment frequency. The results show that the laser-textured electrode achieves a higher current density than the smooth electrode at atmospheric pressure across all examined voltages, whereas the effect of texturing on bubble size and detachment frequency depends on both voltage and pressure. The results were critically compared with findings from the literature and evaluated in terms of the advantages and limitations of using laser-textured electrodes in water electrolysis under elevated pressure. elektroliza vode lasersko strukturiranje površine platinasta mikroelektroda tlak dinamika mehurčkov gostota električnega toka water electrolysis laser surface texturing platinum microelectrode pressure bubble dynamics current density true false false Slovenski jezik Angleški jezik Diplomsko delo/naloga 2026-09-05 08:30:36 2026-09-05 08:30:54 2026-09-06 04:31:01 0000-00-00 00:00:00 2026 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1970-01-01 289371 49473.pdf 49473.pdf 1 58D1643D826E6C555F039743652A3C6B d8b8385694d4cef6a8f8c65bdd8f55ebcf6c7b44af1f500d2a58d31ea78c17a4 57e3fd45-a8f3-11f1-8bc5-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=246146 Fakulteta za strojništvo 0 0 0