Browsing by Author "Karatekin, Hatice Calis"

Now showing 1 - 2 of 2

Highly Efficient Metal Free Aldehyde-Functionalized Indoles for Direct Glucose Fuel Cell Anode Catalyst
(Pergamon-elsevier Science Ltd, 2024) Karatekin, Hatice Calis; Ulas, Berdan; Yilmaz, Yonca; Kivrak, Hilal; Kivrak, Arif
In this study, alternative organic catalysts to metal -containing catalysts for glucose electrooxidation were prepared by the Suzuki Miyaura coupling reaction method and characterized by nuclear magnetic resonance (NMR), fourier transform infrared spectroscopy (FT-IR), and liquid chromatography with tandem mass spectrometry (LCMS -MS). InTA-1, InPA-1, InFA-1, InTA-2, InPA-2, InFA-2, InTA-3, InFA-3, and InPA-3 were obtained with the yield of 74%, 82%, 72%, 70%, 75%, 68%, 60%, 71%, and 85%. Among the synthesized catalysts, the InTA-3 catalyst possesses the highest electrocatalytic activity (3.17 mA cm -2 ) and long-term stability compared to other organic catalysts. InTA-3 catalyst has the lowest charge transfer resistance toward glucose electrooxidation. It was concluded that as a metal -free catalyst, InTA-3 is a cheap and promising electrocatalyst for direct glucose fuel cell anode.
Hydrazine Electrooxidation Performance of Cyano-Substituted Indole Derivatives as Organic Anode Catalyst
(Elsevier, 2024) Karatekin, Hatice Calis; Ulas, Berdan; Yilmaz, Yonca; Kivrak, Hilal; Kivrak, Arif
Here we present the new EWG-substituted indole derivatives, namely 2 -((5 -(1 -methyl -2 -phenyl -1 H-indol-3-yl) thiophen-2-yl)methylene) malonitrile (IPTM), 2 -((5 -(1 -methyl -2 -phenyl -1 H-indol-3-yl)furan-2yl)methyl)malonitrile(IPFM) and 2 -((4 -(1 -methyl -2 -phenyl -1 H-indol-3-yl)benzylidene) malonitrile (IPPM) was synthesized by using Sonogashira coupling, electrophilic cyclization, Suzuki-Miyaura coupling and condensation reactions. The isolated yields were obtained as 86 %, 71 %, and 69 % yields, respectively. Cyclic voltammetry(CV), chronoamperometry (CA), and electrochemical impedance spectroscopy (EIS) were used for the electrochemical measurements to observe the electrocatalytic behavior of IPTM, IPFM and IPPM. The results exhibited that the highest -performance organic -based catalyst was 2.601 mA/cm2 (0.073 mA/mg) for IPPM which could be a good candidate as a metal -free electrocatalyst for hydrazine electrooxidation.