Utjecaj grafenovog oksida na pseudokapacitivna svojstva poli(3,4-etilendioksitiofena)

undergraduate thesis

• Title (english): The influence of graphene oxide on the pseudocapacitive properties of poly(3,4-ethylenedioxythiophene)
• Author: Hrvoje Trinki
• Mentor: Marijana Kraljić Roković (mentor)
• Committee member: Marijana Kraljić Roković (predsjednik povjerenstva)
• Committee member: Elvira Vidović (član povjerenstva)
• Committee member: Suzana Sopčić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2018-09-13, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering; Chemical Engineering in Material Development

Abstract

Cilj ovog rada bio je ugraditi grafenov oksid (GO) u strukturu poli(3,4-etilendioksitiofena) (PEDOT) te ispitati njegov utjecaj na pseudokapacitivna svojstva PEDOT sloja. Metodom kronopotenciometrije određen je optimalan potencijal i optimalna koncentracija Na-polistirensulfonata (PSS) potrebna za sintezu PEDOT i PEDOT/GO slojeva. Sinteza je provedena metodom kronoamperometrije uz različita vremena trajanja sinteze. Polarizacija slojeva na vrijednost potencijala -1 V provedena je s namjerom reduciranja nevodljivog GO u reducirani grafenov oksid (rGO) koji pokazuje dobru električnu provodnost. Elektrokemijska, strukturna i morfološka karakterizacija sintetiziranih PEDOT i PEDOT/GO slojeva provedena je korištenjem tehnike cikličke voltametrije, elektrokemijske impedancijske spektroskopije, UV/Vis spektrofotometrije te metodom skenirajuće elektronske mikroskopije. Uspješno su provedene sinteze PEDOT i PEDOT/GO slojeva kod različitih vremena. Isto tako uspješno je provedena redukcija GO ugrađenog u PEDOT/GO sloj kod potencijala od -1 V. PEDOT slojevi različitih debljina pokazali su čisto kapacitivno ponašanje, dok je za slojeve PEDOT/GO dobiven viši stupanj reverzibilnosti uz smanjenje kapaciteta nakon polarizacije kod potencijala -1 V. Ugradnja GO u PEDOT/GO sloj potvrđena je korištenjem UV/Vis spektrofotometrije te metodom skenirajuće elektronske mikroskopije.

Abstract (english)

The goal of this research was the incorporation of graphene oxide (GO) in the structure of poly-3, 4-ethylenedioxythiophene (PEDOT) and examination of its influence on the pseudocapacitive properties of PEDOT layer. The optimal potential and Na-polystyrene sulfonate (PSS) concentration for the synthesis of PEDOT and PEDOT/GO layers was determined by chronopotentiometric measurements. The synthesis was conducted via chronoamperometry method with different synthesis times. In order to reduce GO to its conductive form, the reduced GO (rGO), polarization of the synthesized layers was carried out at the potential value of -1 V. Cyclic voltammetry, electrochemical impedance spectroscopy, UV/Vis spectrophotometry and scanning electron microscopy were applied in order to characterize electrochemical, structural and morphological properties of PEDOT and PEDOT/GO layers. The synthesis of PEDOT and PEDOT/GO layers was carried our successfully, as well as, the reduction of GO to rGO at the potential value of -1 V. PEDOT layers of different thickness exhibited pure capacitive behaviour, while PEDOT/GO layers showed a higher degree of reversibility and lower capacitance after polarization at the potential value of -1 V. The incorporation of GO into the PEDOT layers was confirmed by using UV/Vis spectrophotometry and scanning electron microscopy.

• Keywords: grafenov oksid; kapacitet; PEDOT; PEDOT/GO; PSS; reverzibilnost
• Keywords (english): graphene oxide; capacitance; PEDOT; PEDOT/GO; PSS; reversibility
• Language: croatian
• URN:NBN: urn:nbn:hr:149:355347
• Study programme: Title: Applied Chemistry - Undergraduate study; specializations in: Environmental chemistry and green technologies, Advanced materials and technologies, Applied organic chemistry; Course: Advanced materials and technologies; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) primijenjene kemije (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) primijenjene kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2021-11-22 12:55:30