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master's thesis
Optimizacija procesa fotoelektrokemijskog dobivanja vodika u prisutnosti askorbinske kiseline
Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology, 2023. urn:nbn:hr:149:086419
Jurić Kaćunić, Danijela
University of Zagreb
Faculty of Chemical Engineering and Technology

Institutional repository: Repository of Faculty of Chemical Engineering and Technology University of Zagreb

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Jurić Kaćunić, D. (2023). Optimizacija procesa fotoelektrokemijskog dobivanja vodika u prisutnosti askorbinske kiseline (Master's thesis). Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology. Retrieved from https://urn.nsk.hr/urn:nbn:hr:149:086419

Jurić Kaćunić, Danijela. "Optimizacija procesa fotoelektrokemijskog dobivanja vodika u prisutnosti askorbinske kiseline." Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, 2023. https://urn.nsk.hr/urn:nbn:hr:149:086419

Jurić Kaćunić, Danijela. "Optimizacija procesa fotoelektrokemijskog dobivanja vodika u prisutnosti askorbinske kiseline." Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, 2023. https://urn.nsk.hr/urn:nbn:hr:149:086419

Jurić Kaćunić, D. (2023). 'Optimizacija procesa fotoelektrokemijskog dobivanja vodika u prisutnosti askorbinske kiseline', Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, accessed 22 November 2024, https://urn.nsk.hr/urn:nbn:hr:149:086419

Jurić Kaćunić D. Optimizacija procesa fotoelektrokemijskog dobivanja vodika u prisutnosti askorbinske kiseline [Master's thesis]. Zagreb: University of Zagreb, Faculty of Chemical Engineering and Technology; 2023 [cited 2024 November 22] Available at: https://urn.nsk.hr/urn:nbn:hr:149:086419

D. Jurić Kaćunić, "Optimizacija procesa fotoelektrokemijskog dobivanja vodika u prisutnosti askorbinske kiseline", Master's thesis, University of Zagreb, Faculty of Chemical Engineering and Technology, Zagreb, 2023. Available at: https://urn.nsk.hr/urn:nbn:hr:149:086419

Metadata
TitleOptimizacija procesa fotoelektrokemijskog dobivanja vodika u prisutnosti askorbinske kiseline
Title (english)Optimization of photoelectrochemical water splitting performance in the presence of ascorbic acid
AuthorDanijela Jurić Kaćunić
MentorMarijana Kraljić Roković (mentor)
Committee memberMarijana Kraljić Roković (predsjednik povjerenstva)
Committee memberJozefina Katić (član povjerenstva)
Committee memberIva Movre Šapić (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Chemical Engineering and Technology
Zagreb
Defense date and country2023-01-27, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Chemical Engineering
Abstract
Cilj ovog rada bio je ispitati fotoelektrokemijski proces dobivanja vodika upotrebom TiO2 i SnS2 elektroda uz askorbinsku kiselinu kao žrtvujuće sredstvo. Sva mjerenja provedena su u otopini 0,1 M NaCl sa i bez askorbinske kiseline. Ispitivanje elektroda provodilo se metodom linearne promjene potencijala (LSV), elektrokemijskom impedancijskom spektroskopijom (EIS), kronoamperometrijom (CA) i mjerenjem potencijala otvorenog kruga (OCP). Adsorpcija askorbinske kiseline na fotokatalitički materijal praćena je metodom UV/VIS spektrofotometrije dok je plinskom kromatografijom određena količina vodika koja se razvija u procesu. Dobivanje vodika se provodilo metodom kronoamperometrije u trajanju od dva sata u atmosferi argona. Vodik je uspješno dobiven, a veće količine dobivene su na SnS2 elektrodi nego na TiO2 elektrodi. Uspoređujući odzive linearne polarizacije osvijetljene i neosvijetljene elektrode, uočava se kako pod djelovanjem svjetla struja raste što znači da su obje elektrode fotoaktivne. Upotrebom askorbinske kiseline dolazi do povećanja fotostruja što je dokaz da askorbinska kiselina djeluje kao žrtvujuće sredstvo. Osim fotostruja, pri potencijalima većim od 0,5 V uočavaju se značajan porast struje koji je posljedica elektrokemijske oksidacije askorbinske kiseline.
Abstract (english)
The aim of this work was to study the photoelectrochemical process of hydrogen production using TiO2 and SnS2 electrodes with ascorbic acid as a sacrificial agent. All measurments were performed in 0.1 M NaCl solution with and without ascorbic acid. The electrodes were tested using linear sweep voltametry (LSV), electrochemical impedance spectroscopy (EIS), chronoamperometry (CA) and open circuit potential (OCP) monitoring. The adsorption of ascorbic acid on the photocatalytic material was monitored by using UV/VIS spectrophotometry, while the amount of hydrogen generated in the process was determined by gas chromatograpy. Hydrogen was produced using the chronoamperometry method during two hours in an argon atmosphere. Hydrogen was successfully obtained, and larger amounts were produced in the process involving SnS2 photoelectrode than in the process involving TiO2 photoelectrode. The linear voltammetry responses of illuminated and non-illuminated electrodes indicate that illumination results in a current increase which is the evidence that both electrodes are photoactive. The ascorbic acid addition increases the photocurrent value. The significant current increase in ascorbic acid solution, observed at potentials more positive than 0.5 V, is the result of electrochemical reaction.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:149:086419
Study programmeTitle: Chemical Engineering - Graduate study
Study programme type: university
Study level: graduate
Academic / professional title: magistar/magistra inženjer/inženjerka kemijskog inženjerstva (magistar/magistra inženjer/inženjerka kemijskog inženjerstva)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Embargo expiration date: 2024-01-01
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Created on2023-02-15 13:13:44