@phdthesis{
author = "Popović, Aleksandra S.",
year = "2024",
abstract = "Predmet naučnog istraživanja ove disertacije je ispitivanje mogućnosti primene punjivih
pozitivnih elektroda na bazi kompozita polipirola, srebro-hlorida i ugljenične tkanine u sistemima sa
elektrolitom na bazi morske vode i legurom magnezijuma kao negativnom elektrodom ćelije, kao
mogućih izvora električne energije elektronskih i električnih komponenti signalne opreme za
spašavanje i plutajućih bova za monitoring životne sredine.
U prvoj fazi izrade disertacije ispitano je elektrohemijsko ponašanje legure magnezijuma AZ63,
polipirola i srebro-hlorida sintetisanih elektrohemijskim metodama na grafitnoj, odnosno srebrnoj
elektrodi, kao model sistema u cilju ispitivanja elektrohemijskih i električnih karakteristika. U cilju
povećanja vrednosti specifičnih kapaciteta, energije i snage i poboljšanja ciklizacionog ponašanja
polipirol je sintetisan na ugljeničnoj tkanini visoko razvijene površine. Na tako pripremljenu
elektrodu nanet je sloj srebro-hlorida jednostavnom i brzom modifikovanom metodom sukcesivne
jonske adsorpcije i reakcije (od eng: Sucesive Ion Layer Adsorption and Reaction, SILAR) u cilju
povećavanja napona ćelije i specifičnog kapaciteta. Ispitana je i funkcionalizacija ugljenične tkanine
jefitnim komercijalnim rastvorom natrijum-hipohlorita u cilju poboljšanja karakteristika punjive
katode. Elektrodni materijali su okarakterisani klasičnim elektrohemijskim metodama u cilju
određivanja potencijala, odnosno napona punjenja i pražnjenja, specifičnog kapaciteta, energije i
snage, kao i ciklizacione stabilnosti, a takođe i spektroskopskim metodama: FE - SEM, XRD, XPS i
FT-IR.
Na kraju je ispitano ponašanje realne ćelije u simuliranoj morskoj vodi i pokazano je da dati
sistem može omogućiti pražnjenje tokom kratkih režima sa velikim strujama i snagom za slanje
podataka, i kontinualno tokom dužeg vremena pri malim strujama i velikom energijom za napajanje
signalnog svetla ili različitih senzora, pri čemu dolazi do redukcije rastvorenog kiseonika na
pozitivnoj elektrodi., The main subject of this dissertation is to examine the possibility to apply rechargeable positive
electrodes based on a composite of polypyrrole, silver chloride and carbon felt in systems with an
electrolyte based on seawater, and a magnesium alloy as the negative electrode of the cell as a
potential source of electric energy for electronic and electrical components of signal equipment for
rescue and floating buoys for environmental monitoring.
In the first part of the dissertation, the electrochemical behavior of magnesium alloy AZ63,
polypyrrole, and silver chloride synthesized by electrochemical methods on a graphite and silver
electrode, respectively, was examined, as a model system to test electrochemical and electrical
characteristics. To increase the value of specific capacity, energy, and power and improve the
cyclization behavior, polypyrrole was synthesized on a carbon felt with a high surface area. A layer
of silver chloride was applied to the electrode thus prepared by a simple and fast modified method of
successive ion adsorption and reaction (Successive Ion Layer Adsorption and Reaction, SILAR) to
increase the cell voltage and specific capacity. The functionalization of the carbon felt with an
inexpensive commercial solution of sodium hypochlorite was also tested to improve the
characteristics of the rechargeable cathode. Electrode materials were characterized by fundamental
electrochemical methods to determine the potentials, i.e. charge and discharge voltage, specific
capacity, energy, and power, as well as cycling stability. Additionally, spectroscopic methods:
FE - SEM, XRD, XPS, and FT- IR were used.
Finally, the behavior of a real cell in simulated seawater was examined, showing that the given
system can enable discharge in short regimes with high currents and power for sending data, and
continuously for a long time applications with low currents for powering a signal light or various
sensors, whereby a reduction of dissolved oxygen can occur on a positive electrodes.",
publisher = "Univerzitet u Beogradu, Tehnološko-metalurški fakultet",
title = "Sinteza novih kompozitnih materijala na bazi uglјenične tkanine-polipirola–srebro-hlorida kao punjivih katoda za sisteme na bazi magnezijuma, Synthesis of new composite materials based on carbon feltpolypyrrole-silver-chloride as rechargeable cathodes for magnesium-based systems",
url = "https://hdl.handle.net/21.15107/rcub_technorep_7509"
}