ELECTROCHEMICAL BEHAVIOR OF POLY(ANILINE-CO-INDOLE) FILM ON TiO2 COATED STAINLESS STEEL ELECTRODES WITH SOL-GEL METHOD

Bu tezde kullanılan özgün ve başka kaynaktan yapılan bildirişlerin, çizelge ve fotoğrafların kaynak gösterilmeden kullanımı, 5846 sayılı Fikir ve Sanat Eserleri Kanunundaki hükümlere tabidir.Bu çalışmada, paslanmaz çelik elektrot ve sol jel yöntemi ile TiO2 kaplanmış paslanmaz çelik elektrot üzerinde poliindol, polianilin ve indol-anilin kopolimerleri sentezlenmiştir. Kopolimer sentezi, iki farklı monomer oranında ki indol:anilin 1:1 ve 1:9 çözeltilerinde gerçekleştirilmiştir. Polimerlerin sentezi elektrokimyasal yöntem ile gerçekleştirilmiştir. TiO2 sol jel çözeltisi ise titanyum bütoksitin hidrolizi ile hazırlanmıştır. TiO2 elektrot yüzeyine daldırma yöntemi ile kaplanmıştır. Yüzeydeki TiO2 kaplama SEM ve EDX yöntemi ile analiz edilmiştir. Sentezlenen polimerin yapısı FT-IR spektroskopisi, morfolojisi SEM görüntüleri ile incelenmiştir. Ayrıca, poliindolün bağlanma şeklini aydınlatmak için 1H NMR spektroskopisi incelenmiştir. Elektrotların korozyon davranışları elektrokimyasal impedans spektroskopisi yöntemi ve anodik polarizasyon eğrileri ile araştırılmıştır.Bu Çalışma Ç. Ü. Araştırma Projeleri Birimi Tarafından Desteklenmiştir. Proje No: FEF2010D2

Electrochemical behavior of poly(aniline-co-indole) film on TiO2 coated stainless steel electrodes with sol-gel method.

TEZ9999Tez (Doktora) -- Çukurova Üniversitesi, Adana, 2013.Kaynakça (s. 117-124) var.xv, 125 s. : res., tablo ; 29 cm.Bu çalışmada, paslanmaz çelik elektrot ve sol jel yöntemi ile TiO2 kaplanmış paslanmaz çelik elektrot üzerinde poliindol, polianilin ve indol-anilin kopolimerleri sentezlenmiştir. Kopolimer sentezi, iki farklı monomer oranında ki indol:anilin 1:1 ve 1:9 çözeltilerinde gerçekleştirilmiştir. Polimerlerin sentezi elektrokimyasal yöntem ile gerçekleştirilmiştir. TiO2 sol jel çözeltisi ise titanyum bütoksitin hidrolizi ile hazırlanmıştır. TiO2 elektrot yüzeyine daldırma yöntemi ile kaplanmıştır. Yüzeydeki TiO2 kaplama SEM ve EDX yöntemi ile analiz edilmiştir. Sentezlenen polimerin yapısı FT-IR spektroskopisi, morfolojisi SEM görüntüleri ile incelenmiştir. Ayrıca, poliindolün bağlanma şeklini aydınlatmak için 1H NMR spektroskopisi incelenmiştir. Elektrotların korozyon davranışları elektrokimyasal impedans spektroskopisi yöntemi ve anodik polarizasyon eğrileri ile araştırılmıştır.In this study, polyindole, polyaniline and copolymers of indole-aniline was synthesized on stainless steel electrode and TiO2 coated stainless steel with sol-gel method. Synthesis of the copolymer was achieved in two different monomer solutions, this monomer feed ratio was indole:aniline 1:1 and 1:9. Polymers were synthesized by electrochemical technique. TiO2 sol-gel solution was prepared by hydrolysis of titanium butoxide. TiO2 on the electrode surface was coated by dipping method. TiO2 coating on the surface was analyzed by SEM and EDX method. Structure of polymers was investigated by FT-IR spectroscopy, and morphology of polymers was examined by SEM images. In addition, to elucidate of the shape of polyindol binding was investigated by 1H NMR spectroscopy. Electrochemical corrosion behaviour of the electrodes was investigated by impedance spectroscopy method and anodic polarization curves.Bu çalışma Ç.Ü. Bilimsel Araştırma Projeleri Birimi tarafından desteklenmiştir. Proje No: FEF2010D20

YUMUŞAK ÇELİK KORUMA İÇİN KOROZYON İNHİBİTÖRÜ OLARAK SULFANİLAMİD KULLANIMI

Bu çalışmada, Sulfanilamide 0,5 M HCl çözeltisinde yumuşak çeliğin (YÇ) yüzeyine adsorpsiyonu ve korozyon inhibisyon mekanizması çalışılmıştır. Bu amaçla elektrokimyasal teknik kullanılmıştır. Elde edilen sonuçlara göre; Sulfanilamid’nın inhibisyon etkinliği artan Sulfanilamid derişimi ile artış göstermiştir. 10 mM Sulfanilamide içeren 0,5 M HCl çözeltisinde inhibisyon etkinliği % 87 olarak tespit edilmiştir. İnhibitör içeren ve içermeyen korozif ortamlar ile maruz bırakılmış yumuşak çelik yüzeyleri taramalı elektron mikroskopu (SEM) ile incelenmiştir. Elde edilen sonuçlar Sulfanilamide metal yüzeyinde homojen dağılımlı, sıkı bir film oluşturarak koruma sağladığı belirlenmiştir

Polyindole top coat on TiO2 sol–gel films for corrosion protection of steel

The protection efficiency of polyindole film on stainless steel was enhanced via titanium dioxide precoating. The characterization of coatings was achieved by nuclear magnetic resonance and Fourier-transform infrared spectra. The surface morphology of electrodes was monitored with scanning electron microscope. The corrosion performance was investigated in 3.5% NaCl solution by electrochemical impedance spectroscopy and potentiodynamic measurements. The quantum calculations were employed, and theoretical parameters were determined. Results showed that the correlation between experimental and theoretical parameters. The high protection efficiency was observed against corrosion on the steel surface via forming a protective polyindole top coated titanium dioxide film.This study has been financially supported by the Cukurova University research fund. The authors are greatly thankful to Çukurova University Research fund. The authors also thank to The Scientific and Technical Research Council of Turkey (TUBITAK

The electrochemical synthesis and corrosion behaviour of TiO2/poly(indole-co-aniline) multilayer coating: Experimental and theoretical approach

The aim of this study was to protect stainless steel against corrosion via poly (indole-co-aniline) with the help of titanium dioxide pre-coating. Different monomer ratios (1:1 and 1:9) were applied in order to determine the suitable chain composition to synthesize the copolymer in lithium perchlorate containing acetonitrile. The structures, morphologies, electrochemical properties and corrosion resistances of the mono and multi-layer coatings were investigated by Fourier-transform infrared spectra, scanning electron microscope, energy dispersive X-ray spectrometer, electrochemical impedance spectroscopy and anodic polarization. Furthermore the geometric structure and electronic properties of indole, aniline, and indole-co-aniline (dimmer) molecules have been investigated by quantum calculations. The results indicated that corrosion protection of copolymers was increased via titanium dioxide pre-coating. The 1:1 copolymer coating showed better corrosion prevention than 1:9 coating. The correlation was determined between experimental and theoretical parameters

Investigation of the hydrogen evolution on Ni deposited titanium oxide nano tubes

Titanium oxide nano tubes (TiOx) were prepared by the electrochemical anodizing method from at different process time and different potential in 0.1 M HF solution. Their morphologies were determined with surface photographs and scanning electron microscopy (SEM) images. Ni nano particles were deposited in conductive TiOx nano tubes arrays via pulsed electrodeposition method. Their catalytic activity towards the hydrogen evolution reaction (HER) was assessed by recording cyclic voltammetry technique, cathodic currentepotential curves, hydrogen gas volumes and electrochemical impedance spectroscopy techniques. The highest HER activity thought the studied is observed on the TiOx(30)-Ni.This study has been financially supported by The Scientific and Technical Research Council of Turkey (TUBITAK) (Project Number: 111T025). The authors are thankful to TUBITAK for their financial support

Experimental and theoretical study on hydrogen production by using Ag nanoparticle-decorated graphite/Ni cathode

In this study, graphite (G) electrode was coated with nickel and decorated with silver nanoparticles (G/Ni/Ag) with the help of galvanostatic method, and electrodes were used as a cathode in alkaline water electrolysis system. The characterization was achieved using X-ray diffraction and field emission scanning electron microscopy. Hydrogen evolution performance of electrodes was investigated via cyclic voltammetry, chronoamperometry, cathodic polarization curves, and electrochemical impedance measurements. Electrochemical results showed that hydrogen production efficiency significantly increased and charge transfer resistance decreased via G/Ni/Ag. The electrochemical water splitting performance of G/Ni/Ag, was established in a joint experimental and computational effort. Water and proton adsorption on Ag-decorated Ni surface were investigated using density functional theory. Electronic structure calculations identified the role of Ag adatom and Ni surface on water and proton adsorptions. From the computational studies, O in water was more reliable to adsorb at the bridge position of the Ag and Ni atoms, leading improved orbital overlap between H and Ni atoms and maximized chemical and physical interactions between the H2O molecules. Therefore, the Ag-decorated Ni(111) surface provides preferable adsorption site for the O atom in water and direct interactions between water Hs and available surface Ni atoms promote water dissociation.The authors are greatly thankful to Mardin Artuklu University Research Fund Office for the financial support (Project Number: MAÜ.BAP.18.SYO.021)

The electrochemical synthesis and corrosion behaviour of TiO 2 /poly(indole-co-aniline) multilayer coating: Experimental and theoretical approach

The aim of this study was to protect stainless steel against corrosion via poly (indole-co-aniline) with the help of titanium dioxide pre-coating. Different monomer ratios (1:1 and 1:9) were applied in order to determine the suitable chain composition to synthesize the copolymer in lithium perchlorate containing acetonitrile. The structures, morphologies, electrochemical properties and corrosion resistances of the mono and multi-layer coatings were investigated by Fourier-transform infrared spectra, scanning electron microscope, energy dispersive X-ray spectrometer, electrochemical impedance spectroscopy and anodic polarization. Furthermore the geometric structure and electronic properties of indole, aniline, and indole-co-aniline (dimmer) molecules have been investigated by quantum calculations. The results indicated that corrosion protection of copolymers was increased via titanium dioxide pre-coating. The 1:1 copolymer coating showed better corrosion prevention than 1:9 coating. The correlation was determined between experimental and theoretical parameters