20.500.12556/RUL-187257 Modifikacija nikljeve pene za uporabo v alkalnem elektrolizerju Modification of Nickel Foam for Application in an Alkaline Electrolyzer V diplomskem delu je bila raziskana modifikacija nikljeve pene z elektrodepozicijo niklja in nikelj–železa za uporabo v alkalnem elektrolizerju. Namen dela je bil preučiti vpliv depozicije s konstantnim tokom in pulzne depozicije na morfologijo, sestavo in elektrokemijski odziv pripravljenih elektrod. Nikljeva pena je bila pred depozicijo ustrezno očiščena, nato pa so bile Ni in Ni–Fe prevleke pripravljene iz sulfatno-kloridnih elektrolitov. Preizkušeni so bili različni tokovni režimi, koncentracije elektrolita ter parametri pulzne depozicije. Za nadaljnje preizkuse sta bili izbrani depozicija s konstantnim tokom 100 mA in pulzna depozicija pri toku 100 mA, času vklopa 10 ms ter času izklopa 50 ms. Ni prevlečene elektrode so bile uporabljene kot katode, Ni–Fe prevlečene elektrode pa kot anode. Morfologija prevlek je bila preučena z vrstičnim elektronskim mikroskopom, njihova elementna sestava pa z energijsko disperzijsko spektroskopijo rentgenskih žarkov. Rezultati so pokazali, da pogoji elektrodepozicije pomembno vplivajo na pokritost nikljeve pene, velikost in porazdelitev delcev ter ohranjanje porozne strukture podlage. Pri prenizki koncentraciji Ni²⁺ ionov je nastala temna plast z zaznanima žveplom in kisikom, zato je bila sestava elektrolita za nadaljnje postopke prilagojena. Pripravljene elektrode so bile preizkušene v 6 M raztopini KOH v dvoelektrodnem alkalnem elektrolizerju. Polarizacijske krivulje in navidezni Taflovi nakloni so bili uporabljeni za primerjavo odziva celotnega elektrolizerja. Delo predstavlja osnovo za nadaljnjo optimizacijo sestave prevlek, pogojev elektrodepozicije in stabilnosti elektrod pri alkalni elektrolizi. This thesis investigated the modification of nickel foam by electrodeposition of nickel and nickel–iron alloy coatings for application in an alkaline electrolyzer. The aim of the work was to examine the influence of constant-current and pulse electrodeposition on the morphology, composition, and electrochemical response of the prepared electrodes. Prior to deposition, the nickel foam was appropriately cleaned. Ni and Ni–Fe coatings were then prepared from sulfate–chloride electrolytes. Different current regimes, electrolyte concentrations, and pulse-deposition parameters were evaluated. Constant- current deposition at 100 mA and pulse deposition at 100 mA with an on-time of 10 ms and an off-time of 50 ms were selected for further experiments. Ni-coated electrodes were used as cathodes, while Ni–Fe-coated electrodes were used as anodes. The morphology of the coatings was examined using scanning electron microscopy, while their elemental composition was determined by energy-dispersive X-ray spectroscopy. The results showed that the electrodeposition conditions significantly affected the coverage of the nickel foam, particle size and distribution, and preservation of the porous substrate structure. At insufficient Ni²⁺ ion concentrations, a dark layer containing sulfur and oxygen was formed; therefore, the electrolyte composition was adjusted for subsequent experiments. The prepared electrodes were tested in 6 M KOH using a two-electrode alkaline electrolyzer. Polarization curves and apparent Tafel slopes were used to compare the response of the entire electrolyzer cell. The work provides a basis for further optimization of coating composition, electrodeposition conditions, and electrode stability during alkaline water electrolysis. elektrodepozicija alkalni elektrolizer nikljeva pena electrodeposition alkaline electrolyzer nickel foam true false false Slovenski jezik Angleški jezik Diplomsko delo/naloga 2026-09-09 13:40:02 2026-09-09 13:40:07 2026-09-11 03:40:21 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 25883 Tomc_Domen_-_Modifikacija_nikljeve_pene_za_uporabo_v_alkalnem_elektrolizerju.pdf Tomc_Domen_-_Modifikacija_nikljeve_pene_za_uporabo_v_alkalnem_elektrolizerju.pdf 1 FAC6F3984EA9F3D473D0357E70654A4B 830ce84a99307ae0d8193854643c5b3ba5482c0f7a84adb6e63611d9d9321dca 2fae86ef-ac43-11f1-8bc5-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=246795 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0