magistrsko delo
Abstract
Vodikov peroksid je snov, katere uporaba je v zadnjih desetletjih v velikem porastu v različnih industrijah in širokem spektru dejavnosti, obenem pa je njena proizvodnja cenovno in energijsko potratna. Zato se že nekaj časa išče okolju prijazen način pridobivanja te spojine, ki bi ublažil že tako obremenjen vpliv na okolje. Rešitev bi lahko bila elektrokemijska sinteza, problem pa se pojavi pri elektrokatalizatorju, ki mora biti dovolj aktiven, selektiven in stabilen.
Ob pomoči predhodnih raziskav smo sintetizirali elektrokatalizator na osnovi niklja na substratu reduciranega grafen oksida dopiranega z dušikom ter ga temeljito okarakterizirali. Elektrokatalizator ima v alkalnem mediju pri nizkih potencialih dobro aktivnosti in selektivnost ter odlično stabilnost. Sinteza elektrokatalizatorja je precej preprosta ter relativno hitra in poceni.
Elektrokatalizator sem dispergiral v dveh različnih topilih in ga v obliki tankih filmov nanesel na tri različne substrate ter preveril njegove elektrokemijske lastnosti. Kot topili sem uporabil N,N-dimetilformamid ter mešanico demineralizirane vode, izopropanola in Nafiona. Elektrokatalizator dispergiran v DMF je na vseh substratih dal najbolj homogene filme, kar smo pokazali z vrstično elektronsko mikroskopijo. Filme sem nanesel na LTCC, nerjavno jeklo ter papir iz ogljikovih vlaken. Najboljše elektrokemijske rezultate je izkazal katalizator nanešen na CFP, kjer je bila v šaržnem elektrokemijskem reaktorju izmerjena gostota toka več kot desetkrat višja kot pri ostalih substratih. Taki filmi se bodo v prihodnosti uporabljali pri elektrosintezi vodikovega peroksida v pretočnih sistemih.
Keywords
papir iz ogljikovih vlaken;CFP;elektrokatalizator;reakcija redukcije kisika;ORR;proizvodnja vodikovega peroksida;tanki filmi;magistrska dela;
Data
Language: |
Slovenian |
Year of publishing: |
2023 |
Typology: |
2.09 - Master's Thesis |
Organization: |
UL FKKT - Faculty of Chemistry and Chemical Technology |
Publisher: |
[T. Babič] |
UDC: |
620.1:66.097.3(043.2) |
COBISS: |
153429251
|
Views: |
20 |
Downloads: |
3 |
Average score: |
0 (0 votes) |
Metadata: |
|
Other data
Secondary language: |
English |
Secondary title: |
Optimization of thin layers of electrocatalyst for hydrogen peroxide production |
Secondary abstract: |
Hydrogen peroxide is a compound whose use has been increasing dramatically in recent decades in a wide range of industries and activities, but its production is both costly and energy-intensive. For this reason, an environmentally friendly way of producing this compound has been sought for some time to mitigate its already high environmental impact. The solution could be electrochemical synthesis, but the problem arises with the electrocatalyst, which must be sufficiently active, selective and stable.
With the help of preliminary research, we have synthesized and thoroughly characterised a nickel-based electrocatalyst on a nitrogen-doped reduced graphene oxide substrate.. The electrocatalyst exhibits good activity and selectivity and excellent stability in alkaline media at low potentials. The synthesis of the electrocatalyst is quite simple and relatively fast and inexpensive.
I dispersed the electrocatalyst in two different solvents and deposited it as thin films on three different substrates and analysed its electrochemical properties. I used N,N-dimethylformamide and a mixture of demineralized water, isopropanol and Nafion as solvents. The electrocatalyst dispersed in DMF performed better on all substrates. Films were deposited on LTCC, stainless steel and carbon fiber paper. By far the best results were obtained on CFP, where the measured current density was more than ten times higher compared to the other two substrates. Such films will be used in the future for the electrosynthesis of hydrogen peroxide flow systems. |
Secondary keywords: |
CFP;electrocatalyst;hydrogen peroxide production;ORR;thin films;Elektrokataliza;Univerzitetna in visokošolska dela; |
Type (COBISS): |
Master's thesis/paper |
Study programme: |
1000376 |
Embargo end date (OpenAIRE): |
1970-01-01 |
Thesis comment: |
Univ. v Ljubljani, Fak. za kemijo in kemijsko tehnologijo, smer Kemijsko inženirstvo |
Pages: |
44 str. |
ID: |
18957944 |