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Article Citation - WoS: 5Citation - Scopus: 5Electrochemical Polymerization of 4-Allylanisole(Pergamon-elsevier Science Ltd, 2001) Cihaner, A; Testereci, HN; Önal, AMElectrochemical polymerization of 3-allylanisole (4AA). via constant potential electrolysis, has been investigated in acetonitrile using two different supporting electrolytes. Redox behavior of the monomer was also studied in the same solvent-electrolyte couples at room temperature. Electrochemical polymerization of the monomer yielded insoluble polymer films on the electrode surface, which bears a very low conductivity, together with the low molecular weight polymers in the bulk of the solution. The decrease in the monomer concentration, during the electrochemical polymerization. was monitored by taking the cyclic voltammogram of the electrolysis solution. The effect of temperature on the rate of electrochemical polymerization was: also studied. The polymers were characterized by taking the H-1-NMR and FTIR spectra. Molecular weight of the soluble polymer was determined by vapor pressure osmometry. Thermal analysis of the polymer film and soluble polymer were done by DSC. (C) 2001 Elsevier Science Ltd. All rights reserved.Article Citation - WoS: 26Citation - Scopus: 27Performance of an Ht-Pemfc Having a Catalyst With Graphene and Multiwalled Carbon Nanotube Support(Wiley, 2019) Alpaydin, Guvenc Umur; Devrim, Yilser; Colpan, C. OzgurIn this study, the effect of multiwalled carbon nanotube and graphene nanoplatelet-based catalyst supports on the performance of reformate gas-fed polybenzimidazole (PBI)-based high-temperature proton exchange membrane fuel cell (HT-PEMFC) was investigated. In addition, the effect of several microwave conditions on the performance of the Pt-Ru/multiwalled carbon nanotube (MWCNT)-graphene nanoplatelet (GNP) catalyst was assessed. Through X-ray diffraction, thermal gravimetric analysis, transmission electron microscopy, scanning electron microscopy, and energy dispersive spectroscopy, the catalysts' chemical structure and morphology were characterized. Cyclic voltammetry analysis was used for the electrochemical characterization of catalysts through an electrochemical cell with three electrodes connected to a potentiostat. The results showed that the best performing catalyst is the catalyst produced using 800-W power for 40 seconds. The electrochemically active surface area values of this catalyst ranged from 54 to 45 m(2)/g. Single-cell performance tests of the HT-PEMFC were then carried out. In these tests, reformate gas mixture, consisting of H-2, CO2, and CO, was fed to the anode side at 160 degrees C without humidification. These tests for the best performing catalyst yielded peak power density of 0.280 W/cm(2) and current density (at 0.6 V) of 0.180 A/cm(2) in the H-2/air environment and peak power density of 0.266 W/cm(2) and current density (at 0.6 V) of 0.171 A/cm(2) in the reformate gas/air environment. As a result of the experiments, it was found that Pt-Ru/MWCNT-GNP hybrid material is a suitable catalyst for HT-PEMFC.
