Yazar "Yilmaz, Orhan" seçeneğine göre listele

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    A novel H2S/H2O2 fuel cell operating at the temperature of 298K
    (Wiley, 2013) Sanli, Ayse Elif; Yilmaz, Orhan; Aytac, Aylin
    In this study, the oxidation mechanism of hydrogen sulfide (H2S) is investigated, and a fuel cell operating with acidic peroxide as oxidant and basic hydrogen sulfide as fuel is constructed. A stable solid state H2S/H2O2 fuel cell has been developed at the temperature of 298K. A nickel anode catalyst has been examined using Nafion-117 as a proton-conducting membrane. In an operating with the acidic hydrogen peroxide (H2O2) as oxidant, the cell potential was increased to a value of 0.85V at 298K. The main conclusion of this study is the management to increase the cell potential to 850mV at 25 degrees C, whereas this value can only be achieved in the H2S/O-2 fuel cell at 850-1000 degrees C. Moreover, there exists no prior work on the H2S/H2O2 fuel cell research. Copyright (c) 2012 John Wiley & Sons, Ltd.
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    Investigation of the electro-oxidation of artificial Black Sea water using cyclic voltammetry on metal sulfide electrodes (I)
    (Pergamon-Elsevier Science Ltd, 2014) Sanli, Ayse Elif; Yilmaz, Orhan; Aytac, Aylin; Mat, Mahmut D.
    Black Seawater is an alternative hydrogen source because it has hydrogen sulfide content. Seawater electrolysis is a promising method to produce hydrogen. The anodic oxidation of hydrogen sulfide is a novel approach for directly generating electricity via fuel cells. Therefore, four materials (Cu, Stainless Steel 304 (SS), V2O5 and Ni) were examined in artificial seawater containing hydrogen sulfide (HS-). We developed active metal sulfide electrodes for oxidizing HS-. Alongside the corrosion potentials, the progression of the oxidation and reduction reactions was obtained by the cyclic voltammetry method. The active behaviors of the metal sulfide (MSx) layers were determined by applying Electrochemical Impedance Spectroscopy (EIS). Although the Cu2S electrode acts as the active catalyst during HS- ion oxidation, NiS is the most suitable metal sulfide because it exhibits a higher corrosion resistance than Cu2S. While V2O5 demonstrates catalytic activity at high temperatures (>= 30 degrees C), FeS layers corrode easily in the artificial seawater environment. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.